PROJECT UPDATES & TRAFFIC IMPACTS

August 2026

    08-20-2026 Project Update

    This update includes a back to school and work zone safety alert as well as construction progress, planned work and ongoing traffic impacts for the Santa Fe and Mineral Improvements project in Arapahoe County.

    Back to School & Work Zone Safety Alert

    The new school year has begun, with increased traffic and school buses expected through the work zone. Please observe the following oversized truck/bus restrictions on Mineral Avenue at Platte River Parkway, and pedestrian and bicycle access restrictions within the wider work zone.

    Heavy morning and afternoon traffic, increased congestion, active school zones, and stops for school buses can be expected.

    A 45-foot maximum length bus or truck restriction is in place to safely navigate the right turn from southbound Platte River Parkway to westbound Mineral Avenue.

    Signs have been added alerting the traveling public and school bus and commercial drivers of the length and turn restrictions.

    Detour routes are posted to Aspen Grove Way and Santa Fe Drive.

    No unauthorized pedestrian or bicycle access is permitted within closed areas of the work zone at any time for safety reasons.

    Barrier and other construction devices are in place to protect the general public from hazardous conditions, and to provide construction crews and authorized personnel with unobstructed access within these closed areas to perform safety critical work.

    Pedestrian and bicycle access is only permitted on sidewalks in public right-of-way areas. Bicyclists must yield to pedestrians.

    Construction Progress & Planned Work

    Since the last update, crews have made progress placing road base and preparing the surface of the new lane on the west side of Santa Fe Drive as well as the south side of Mineral Avenue at Platte River Parkway for asphalt paving. Other work included installing cobblestones and pouring median covers at the roundabout, and starting formwork for medians and curb and gutter at the intersection of Mineral Avenue and Platte River Parkway.

    Planned work over the next two weeks includes forming and pouring concrete for medians and curb and gutter on Mineral Avenue at the Platte River Parkway intersection, and patching concrete at the roundabout. Electrical crews will also be onsite pulling wire and installing pullboxes and light poles.

    As work progresses, some modifications to the current lane configurations on Mineral Avenue will be implemented. A notification will be sent out in advance of any new traffic impacts.

    Recent drone views of construction of the new quad roadway at Santa Fe and Mineral - 7/29/26. Aerial photography by SEMA Construction and HDR, Inc.

    24/7 Traffic Impacts

     Reduced alignment & other restrictions - Mineral Avenue

    • Traffic on Mineral Avenue from just west of Santa Fe Drive to west of Platte River Parkway is reduced to a two-way, single lane alignment.
    • The right turn lane on westbound Mineral Avenue at Platte River Parkway is closed. Right turns are permitted from the through lane. Please exercise caution.
    • An oversized restriction of 45-feet long is in place for all trucks, buses and commercial vehicles when making right turn movements from southbound Platte River Parkway to westbound Mineral Avenue. 
    • The traffic signals have been removed and barrier and construction devices are in place separating eastbound and westbound traffic.
    • No Eastbound Mineral Avenue Left Turns: No left turns are permitted to and from Platte River Parkway on eastbound Mineral Avenue. 
    • Eastbound Mineral Avenue Detour Routes: Signs will direct motorists to Aspen Grove and Santa Fe Drive to bypass the restrictions.
    • No u-turns are permitted within the work zone.
    • Please refer to the map below for the location, impacts and detours.
    • The speed limit on Mineral Avenue is 45 mph.
    • Please drive slowly, stay alert, merge when directed, and follow all posted signs. 
    • Visit Cone Zone for more details.


    Location and configuration of the traffic shift on Mineral Avenue at the Platte River Parkway intersection, with turn restrictions and recommended detour route.

    Shoulder Closure - Santa Fe Drive (US 85) 

    • The right shoulder on southbound Santa Fe Drive is closed 24/7 until further notice.
    • The project limits on Santa Fe Drive extend a half-mile north and south of the Mineral Avenue intersection, from Mile Point 201 to MP 202 in the City of Littleton.
    • A speed limit of 50 mph is in place on Santa Fe Drive.
    • Check the Cone Zone Page or COtrip.org for details. 

    About the Project

    • The project began in late 2025 with anticipated completion by fall 2027.
    • Normal working hours are 7 a.m. to 5 p.m. Monday to Friday.
    • Some overnight work will take place from 7 p.m. to 5 a.m.
    • Work includes building a quadrant roadway and roundabout; widening Santa Fe Drive and Mineral Avenue; adding new lane configurations; installing new traffic signals; and making mobility and safety improvements.                              

    Stay Connected!

    • Webpage: www.LetsTalkLittleton.org/Santa-Fe-Mineral-Improvements
    • Hotline: 720-260-7074
    • Email: publicinformation@comcast.net
    • Sign up for text alerts: Text quadroadway to 8882199094
    • Traffic impacts: LittletonCO.gov/ConeZone
    • CDOT Traffic Impacts: COtrip.org
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    08-06-2026 Project Update

    This biweekly update consists of a work zone safety alert reminder as well as construction progress, planned work and updated traffic impacts for the Santa Fe and Mineral Improvements project in Arapahoe County.

    Reminder - Work Zone Safety Alert

    Please help us maintain safety within the work zone by following these important safety tips:

    • No unauthorized pedestrian or bicycle access is permitted within closed areas of the work zone at any time for safety reasons.
    • Barrier and other construction devices are in place to protect the general public from hazardous conditions, and to provide construction crews and authorized personnel with unobstructed access within these closed areas to perform safety critical work.
    • Pedestrian and bicycle access is only permitted on sidewalks in public right-of-way areas. Bicyclists must yield to pedestrians.

    Drone views of crews asphalt paving the Platte River Parkway extension for the new quad roadway at Santa Fe and Mineral - July 29, 2026. Aerial photography by HDR, Inc.

    Construction Progress & Planned Work

    Since the last update, crews finished preparing the road surface and asphalt paved the Platte River Parkway extension from Nichols to the south side of Mineral Avenue. Crews also continued concrete flatwork, reconditioned subgrade for the new lane on the west side of Santa Fe Drive, and began formwork for a median island at Platte River Parkway and Mineral Avenue.

    Planned work over the next two weeks includes earthwork and reconditioning subgrade on Mineral Avenue, forming and pouring curb and gutter at Mineral as well as median covers at the roundabout, and adding pavement striping.

    As work progresses, some modifications to the current lane configurations on Mineral Avenue will be implemented. A notification will be sent out in advance of any new traffic impacts.

    We appreciate the continued cooperation of area residents, businesses and the traveling public during lane closures and other restrictions as we build the new quad roadway and improve the corridor.

    Drone views of construction progress on the new quad roadway and roundabout at Santa Fe and Mineral - Aug. 5, 2026. Aerial photography by SEMA Construction.

    Updated - 24/7 Traffic Impacts

    Reduced Alignment - Mineral Avenue at Platte River Parkway 

    • 8/6 Update: The right turn lane on westbound Mineral Avenue at Platte River Parkway is closed. Right turns are permitted from the through lane. Please exercise caution.
    • Traffic on Mineral Avenue from just west of Santa Fe Drive to west of Platte River Parkway is reduced to a two-way, single lane alignment.
    • The traffic signals have been removed and barrier and construction devices are in place separating eastbound and westbound traffic.
    • No Eastbound Mineral Avenue Left Turns: No left turns are permitted to and from Platte River Parkway on eastbound Mineral Avenue. 
    • Eastbound Mineral Avenue Detour Routes: Signs will direct motorists to Aspen Grove and Santa Fe Drive to bypass the restrictions.
    • No u-turns are permitted within the work zone.
    • Please refer to the map below for the location, impacts and detours.
    • The speed limit on Mineral Avenue is 45 mph.
    • Please drive slowly, stay alert, merge when directed, and follow all posted signs. 
    • Visit Cone Zone for more details.       

    Location and configuration of the traffic shift on Mineral Avenue at the Platte River Parkway intersection, with turn restrictions and recommended detour route. 

    Shoulder Closure - Santa Fe Drive (US 85) 

    The right shoulder on southbound Santa Fe Drive is closed 24/7 until further notice.

    The project limits on Santa Fe Drive extend a half-mile north and south of the Mineral Avenue intersection, from Mile Point 201 to MP 202 in the City of Littleton.

    A speed limit of 50 mph is in place on Santa Fe Drive.

    Check the Cone Zone Page or COtrip.org for details. 

    About the Project

    • The project began in late 2025 with anticipated completion by fall 2027.
    • Normal working hours are 7 a.m. to 5 p.m. Monday to Friday.
    • Some overnight work will take place from 7 p.m. to 5 a.m.
    • Work includes building a quadrant roadway and roundabout; widening Santa Fe Drive and Mineral Avenue; adding new lane configurations; installing new traffic signals; and making mobility and safety improvements.

    Stay Connected!

    • Webpage: www.LetsTalkLittleton.org/Santa-Fe-Mineral-Improvements
    • Hotline: 720-260-7074
    • Email: publicinformation@comcast.net
    • Sign up for text alerts: Text quadroadway to 8882199094
    • Traffic impacts: LittletonCO.gov/ConeZone
    • CDOT Traffic Impacts: COtrip.org
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July 2026

    07-23-2026 Project Update

    This biweekly update consists of construction progress, planned work, new and ongoing traffic impacts, and a safety alert for the Santa Fe and Mineral Improvements project in Arapahoe County.

    Short-term lane closures and turn restrictions will be in place early next week at the Mineral Avenue and Platte River Parkway intersection. Flaggers will be present to manage traffic flows and maintain safety. Detours will be posted. Please refer to New Weekday Traffic Impacts below for more details.

    We appreciate the public's continued cooperation during traffic shifts and other impacts as we build the new quad roadway.

    Drone view of progress on the new quad roadway and roundabout at Santa Fe and Mineral. Photography by HDR, Inc.

    Construction Progress & Planned Work

    Over the last two weeks, crews made progress forming new curb and gutter from Mineral to Nichols and installing road base on the newly widened section of highway on the west side of Santa Fe Drive. Other work included fine grading and preparing the Platte River Parkway extension to and from the new roundabout for asphalt paving. Crews also excavated and reconditioned subgrade on the south side of Mineral Avenue, and formed curb and gutter for a median island at Platte River Parkway and Mineral Avenue.

    Planned work over the next two weeks includes forming and pouring curb and gutter on the west side of Santa Fe Drive from Mineral to Nichols, and paving the Platte River Parkway extension from Santa Fe Drive to the roundabout and north to the south side of Mineral Avenue. Other scheduled activities include pouring the new median island and preparing the south side of Mineral Avenue at Platte River Parkway for paving. Utility crews will also be onsite installing storm drainage pipe and potholing for utilities.

    Recent views of poured curb and gutter near the roundabout, and newly widened section of roadway on the west side of Santa Fe Drive. Photography by Estate Media.

    New - Weekday Traffic Impacts

    Monday, July 27 & Tuesday, July 28 - Westbound Mineral Avenue at Platte River Parkway - temporary right turn lane closures/restrictions.

    The following traffic impacts can be expected from 9:30 a.m. to 2 p.m. on Monday, July 27 and Tuesday, July 28.

    • The westbound Mineral Avenue right turn lane to northbound Platte River Parkway will be closed.
    • The westbound Mineral Avenue through lane at the Platte River Parkway intersection will be managed by flaggers.
    • The southbound Platte River Parkway right turn lane onto westbound Mineral Avenue will be fully closed, with detours posted to Aspen Grove and Santa Fe Drive to enter westbound Mineral Avenue. 
    • Please drive slowly, stay alert, and follow the directions of flaggers and all posted signs. 
    • Visit Cone Zone for more details.       

    24/7 Traffic Impacts

    Reduced Alignment - Mineral Avenue at Platte River Parkway 

    • Traffic on Mineral Avenue from just west of Santa Fe Drive to west of Platte River Parkway is reduced to a two-way, single lane alignment.
    • The traffic signals have been removed and barrier and construction devices are in place separating eastbound and westbound traffic.
    • No Eastbound Mineral Avenue Left Turns: No left turns are permitted to and from Platte River Parkway on eastbound Mineral Avenue. 
    • Eastbound Mineral Avenue Detour Routes: Signs will direct motorists to Aspen Grove and Santa Fe Drive to bypass the restrictions.
    • Right turns to and from Platte River Parkway on westbound Mineral Avenue remain in place, unless otherwise posted.
    • No u-turns are permitted within the work zone.
    • Please refer to the map below for the location, impacts and detours.
    • The speed limit on Mineral Avenue is 45 mph.
    • Please drive slowly, stay alert, merge when directed, and follow all posted signs. 
    • Visit Cone Zone for more details.       

    Location and configuration of the traffic shift on Mineral Avenue at the Platte River Parkway intersection, with turn restrictions and recommended detour route. 

    Shoulder Closure - Santa Fe Drive (US 85) 

    The right shoulder on southbound Santa Fe Drive is closed 24/7 until further notice.

    The project limits on Santa Fe Drive extend a half-mile north and south of the Mineral Avenue intersection, from Mile Point 201 to MP 202 in the City of Littleton.

    A speed limit of 50 mph is in place on Santa Fe Drive.

    Check the Cone Zone Page or COtrip.org for details. 

    Work Zone Safety Alert

    This safety alert is a reminder that no pedestrian or bicyclist access is permitted in the work zone. Please help maintain safety by following these important safety tips:

    • No pedestrians or bicyclists are permitted within the work zone at any time for safety reasons. 
    • The closure area is barricaded to maintain a clear work zone so authorized crews can mobilize heavy equipment and perform safety critical work.
    • Trenches and hazardous conditions exist.
    • Pedestrian and bicycle access is only permitted on sidewalks in public right-of-way areas. Bicyclists must yield to pedestrians.

    About the Project

    • The project began in late 2025 with anticipated completion by fall 2027.
    • Normal working hours are 7 a.m. to 5 p.m. Monday to Friday.
    • Some overnight work will take place from 7 p.m. to 5 a.m.
    • Work includes building a quadrant roadway and roundabout; widening Santa Fe Drive and Mineral Avenue; adding new lane configurations; installing new traffic signals; and making mobility and safety improvements.

    Stay Connected!

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    07-09-2026 Project Update

    This biweekly update consists of construction progress, planned work, traffic impacts and a safety alert for the Santa Fe and Mineral Improvements project in Arapahoe County.

    We appreciate the public's continued cooperation and adherance to lane reductions and turn restrictions on Mineral Avenue during this important phase of construction of the new quad roadway.

    Recent drone view of construction progress on the new quad roadway at Santa Fe and Mineral. Photography by HDR, Inc.

    Construction Progress & Planned Work

    Over the last two weeks, crews have made progress performing concrete flatwork, reconditioning the newly widened roadway on the west side of Santa Fe Drive, and adding road base and fine grading to prepare the Platte River Parkway extension for paving. Curb and gutter has been installed from Santa Fe Drive west to the new roundabout and north to the south side of Mineral Avenue, where removals of concrete and asphalt are ongoing for that section of the future quad roadway.

    Planned work over the next two weeks includes starting curb and gutter formwork along the west side of Santa Fe Drive from Mineral to Nichols, and asphalt paving the Platte River Parkway extension and new roadway on the west side of Santa Fe Drive. Other scheduled activities include excavating and reconditioning subgrade on the south side of Mineral Avenue and forming curb and gutter for a median island at Platte River Parkway and Mineral Avenue.

    Views of newly built curb and gutter from Santa Fe Drive to the roundabout and north to Mineral Avenue. Photography by Estate Media.

    24/7 Traffic Impacts

    Reduced Alignment - Mineral Avenue at Platte River Parkway 

    • Traffic on Mineral Avenue from just west of Santa Fe Drive to west of Platte River Parkway is reduced to a two-way, single lane alignment.
    • The traffic signals have been removed and barrier and construction devices are in place separating eastbound and westbound traffic.
    • No Eastbound Mineral Avenue Left Turns: No left turns are permitted to and from Platte River Parkway on eastbound Mineral Avenue. 
    • Eastbound Mineral Avenue Detour Routes: Signs will direct motorists to Aspen Grove and Santa Fe Drive to bypass the restrictions.
    • Right turns to and from Platte River Parkway on westbound Mineral Avenue remain in place.
    • No u-turns are permitted within the work zone.
    • Please refer to the map below for the location, impacts and detours.
    • The speed limit on Mineral Avenue is 45 mph.
    • Please drive slowly, stay alert, merge when directed, and follow all posted signs. 
    • Visit Cone Zone for more details.      

    Shoulder Closure - Santa Fe Drive (US 85) 

    • The right shoulder on southbound Santa Fe Drive is closed 24/7 until further notice.
    • The project limits on Santa Fe Drive extend a half-mile north and south of the Mineral Avenue intersection, from Mile Point 201 to MP 202 in the City of Littleton.
    • A speed limit of 50 mph is in place on Santa Fe Drive.
    • Check the Cone Zone Page or COtrip.org for details. 

    Work Zone Safety Alert 

    This safety alert is a reminder that no pedestrian or bicyclist access is permitted in the work zone. Please help maintain safety by following these important safety tips:

    • No pedestrians or bicyclists are permitted within the work zone at any time for safety reasons. 
    • Only authorized construction vehicles and crews are permitted within the closure area.
    • The closure area is barricaded to maintain a clear work zone so crews can mobilize heavy equipment and perform safety critical work.
    • Trenches and hazardous conditions exist.
    • Please observe posted signs and barricades so we can maintain a safe and secure work zone for construction crews.
    • Pedestrian and bicycle access is only permitted on sidewalks in public right-of-way areas. Bicyclists must yield to pedestrians.

    About the Project

    • The project began in late 2025 with anticipated completion by fall 2027.
    • Normal working hours are 7 a.m. to 5 p.m. Monday to Friday.
    • Some overnight work will take place from 7 p.m. to 5 a.m.
    • Work includes building a quadrant roadway and roundabout; widening Santa Fe Drive and Mineral Avenue; adding new lane configurations; installing new traffic signals; and making mobility and safety improvements.

    Stay Connected!

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June 2026

    06-25-2026 Project Update

    This biweekly update consists of a new safety alert as well as construction progress, planned work and ongoing traffic impacts for the Santa Fe and Mineral Improvements project in Arapahoe County.

    We appreciate the public's continued cooperation and adherance to new lane restrictions and detours on Mineral Avenue during this phase of construction.

    Work Zone Safety Alert 

    This safety alert is a reminder that no pedestrian or bicyclist access is permitted in the work zone. Please help maintain safety by following these important safety tips:

    • No pedestrians or bicyclists are permitted within the work zone at any time for safety reasons. 
    • Only authorized construction vehicles and crews are permitted within the closure area.
    • The closure area is barricaded to maintain a clear work zone so crews can mobilize heavy equipment and perform safety critical work.
    • Trenches and hazardous conditions exist.
    • Please observe posted signs and barricades so we can maintain a safe and secure work zone for construction crews.
    • Pedestrian and bicycle access is only permitted on sidewalks in public right-of-way areas. Bicyclists must yield to pedestrians.

    Construction Progress & Planned Work

    Since the last update, significant progress has been made on all aspects of constructing the new quad roadway at Santa Fe and Mineral. Crews poured the new truck apron at the roundabout; reconditioned and placed road base on the newly widened area of roadway on the west side of Santa Fe Drive; and continued removals of asphalt and concrete within the closed area of Mineral Avenue at Platte River Parkway.

    Planned work over the next two weeks includes installing new curb and gutter and pouring caissons for light foundations on the west side of Santa Fe Drive, and performing ongoing removals at the south side of Mineral Avenue for construction of that section of the future quad roadway.

    Other scheduled work at the roundabout and Platte River Parkway extension includes drilling and pouring light caissons; performing concrete flatwork; and preparing the roadway for asphalt paving.

    Recent views of newly built curb and gutter for the new quad roadway extension of Platte River Parkway. Photography by Estate Media.

    24/7 Traffic Impacts

    Reduced Alignment - Mineral Avenue at Platte River Parkway 

    • Traffic on Mineral Avenue from just west of Santa Fe Drive to west of Platte River Parkway is reduced to a two-way, single lane alignment.
    • The traffic signals have been removed and barrier and construction devices are in place separating eastbound and westbound traffic.
    • No Eastbound Mineral Avenue Left Turns: No left turns are permitted to and from Platte River Parkway on eastbound Mineral Avenue. 
    • Eastbound Mineral Avenue Detour Routes: Signs will direct motorists to Aspen Grove and Santa Fe Drive to bypass the restrictions.
    • Right turns to and from Platte River Parkway on westbound Mineral Avenue remain in place.
    • No u-turns are permitted within the work zone.
    • Please refer to the map below for the location, impacts and detours.
    • The speed limit on Mineral Avenue is 45 mph.
    • Please drive slowly, stay alert, merge when directed, and follow all posted signs. 
    • Visit Cone Zone for more details.       

    Shoulder Closure - Santa Fe Drive (US 85) 

    The right shoulder on southbound Santa Fe Drive is closed 24/7 until mid-July.

    The project limits on Santa Fe Drive extend a half-mile north and south of the Mineral Avenue intersection, from Mile Point 201 to MP 202 in the City of Littleton.

    A speed limit of 50 mph is in place on Santa Fe Drive.

    Check the Cone Zone Page or COtrip.org for details. 

    About the Project

    • The project began in late 2025 with anticipated completion by fall 2027.
    • Normal working hours are 7 a.m. to 5 p.m. Monday to Friday.
    • Some overnight work will take place from 7 p.m. to 5 a.m.
    • Work includes building a quadrant roadway and roundabout; widening Santa Fe Drive and Mineral Avenue; adding new lane configurations; installing new traffic signals; and making mobility and safety improvements.

    Stay Connected!

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    06-11-2026 Project Update

    This project update includes construction progress, planned work, and ongoing traffic impacts for the next two weeks for the Santa Fe and Mineral Improvements project in Arapahoe County.

    We appreciate the public's continued cooperation and adherance to new lane restrictions and detours on Mineral Avenue during this important phase of construction. 

    Construction progress on the new quad roadway and roundabout. Aerial photography by HDR, Inc. & SEMA.

    Construction Progress & Planned Work

    Since the last update and reaching a 25% project completion milestone, crews have made significant progress widening, grading and constructing base course on the west side of Santa Fe Drive, and installing curb and gutter, sidewalks and medians for the new roundabout and Platte River Parkway extension of the new quad roadway. Other work included removing asphalt and concrete on the south side of Mineral Avenue at Platte River Parkway which will connect to the quad roadway, and performing drainage and other utility work.

    Over the next few weeks, crews will recondition and place road base for the newly widened west side of Santa Fe Drive and continue concrete flatwork including pouring the new truck apron at the roundabout. Other planned work includes preparing the Platte River Parkway extension for asphalt paving, clearing the south side of Mineral Avenue, and performing ongoing drainage, lighting and electrical installations sitewide.

    Views of work underway on the south side of Mineral Avenue; newly built curb and gutter for the new quad roadway extension of Platte River Parkway. Photography by Estate Media.

    24/7 Traffic Impacts

    New Traffic Pattern - Mineral Avenue 

    Both directions of traffic on Mineral Avenue from just west of Santa Fe Drive (US Highway 85) to west of Platte River Parkway have been shifted to the north side of the roadway into a two-way, single lane alignment. The following impacts and restrictions are in place until further notice:

    • The traffic signals at the Platte River Parkway and Mineral Avenue intersection have been removed.
    • No Eastbound Mineral Avenue Left Turns: No left turns are permitted to and from Platte River Parkway on eastbound Mineral Avenue. 
    • Eastbound Mineral Avenue Detour Routes: Signs will direct motorists to Aspen Grove and Santa Fe Drive to bypass the restrictions.
    • Right turns to and from Platte River Parkway on westbound Mineral Avenue remain in place.
    • No u-turns are permitted within the work zone.
    • Please refer to the map below for the location, impacts and detours.
    • The speed limit on Mineral Avenue is 45 mph.
    • Please drive slowly, stay alert, merge when directed, and follow all posted signs. 
    • Visit Cone Zone for more details.       

    Shoulder Closure - Santa Fe Drive (US 85) 

    • The right shoulder on southbound Santa Fe Drive is closed 24/7 until mid-July.
    • The project limits on Santa Fe Drive extend a half-mile north and south of the Mineral Avenue intersection, from Mile Point 201 to MP 202 in the City of Littleton.
    • A speed limit of 50 mph is in place on Santa Fe Drive.
    • Check the Cone Zone Page or COtrip.org for details. 

    About the Project

    • The project began in late 2025 with anticipated completion by fall 2027.
    • Normal working hours are 7 a.m. to 5 p.m. Monday to Friday.
    • Some overnight work will take place from 7 p.m. to 5 a.m.
    • Work includes building a quadrant roadway and roundabout; widening Santa Fe Drive and Mineral Avenue; adding new lane configurations; installing new traffic signals; and making mobility and safety improvements.

    Stay Connected!

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    06-04-2026 - Travel Advisory

    Updated Travel Advisory

    Mineral Avenue single lane alignment at Platte River Parkway, managed by flagger operations

    9:30 a.m. - 2 p.m., Tuesday, June 9

    *This update replaces the version sent earlier.

    The City of Littleton, in cooperation with SEMA Construction, will close a section of eastbound Mineral Avenue near the Platte River Parkway intersection from 9:30 a.m. to 2 p.m. on Tuesday, June 9 to install barrier. During this brief period, flagging operations will be in effect and traffic may be limited to a single lane or stopped for short durations. Delays can be expected and alternate routes are advised.

    We appreciate the public's cooperation during this flagger operation as we set barrier to improve safety within the current Mineral Avenue traffic shift.

    Traffic Impacts - Mineral Avenue at Platte River Parkway

    Tuesday, June 9 - both directions of Mineral Ave - single lane alignment with brief holds, managed by flaggers.

    • Starting at 9:30 a.m. and lasting until about 2 p.m. on Tuesday, June 9, both directions of Mineral Avenue at the approach to Platte River Parkway may be limited to a single lane or stopped for short durations. 
    • Flaggers will be present to manage alternating traffic flows.
    • The reduced alignment is necessary while crews set barrier to improve safety.
    • Once complete, the road will be restored to the current two-way, single lane alignment until further notice.
    • Delays can be expected and alternate routes are advised.
    • Variable message boards will be posted alerting the traveling public to the single lane alignment and flagging operation and to expect delays.
    • Please observe all posted signs and exercise caution when driving through the work zone.
    • Check the Cone Zone Page for scheduled traffic impacts.
    • Work includes setting barrier.

    About the Project

    • The project began in late November 2025 with anticipated full completion by fall 2027.
    • Normal working hours are 7 a.m. to 5 p.m. Monday to Friday.
    • Some overnight work will take place from 7 p.m. to 5 a.m.
    • Work includes building a quadrant roadway and roundabout, widening Santa Fe Drive and Mineral Avenue, adding new lane configurations, installing new traffic signals, and making area mobility and safety improvements. 

    Stay Connected!

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May 2026

    05-28-2026 - Project Update

    This project update includes construction progress, planned work, and ongoing traffic impacts for the next two weeks for the Santa Fe and Mineral Improvements project in Arapahoe County.

    We appreciate the public's continued cooperation and adherance to new lane restrictions and detours on Mineral Avenue during this important phase of construction. 

    Drone view of construction progress on the new quad roadway and roundabout. Aerial photography by HDR, Inc. & SEMA.

    Construction Progress & Planned Work

    We are excited to inform the public that we have reached the 25-percent project completion milestone. Since the last update, crews have made significant progress cutting and filling embankment areas on the west side of Santa Fe Drive for widening, removing concrete and asphalt and clearing on the south side of Mineral Avenue, and forming and pouring curb and gutter and medians for the Platte River Parkway extension and roundabout.

    Over the next few weeks, crews will continue pouring concrete and median covers at the roundabout and Platte River Parkway extension, and asphalt pave sections of the new roadway. Other ongoing work includes performing embankment cut and fills on the west side of Santa Fe Drive; removing old concrete and asphalt on Mineral Avenue; installing electrical conduit and light pole foundations; and placing new drainage pipe and inlet structures.

    Views of newly built curb and gutter and medians for the new quad roadway extension of Platte River Parkway. Photography by Estate Media.

    24/7 Traffic Impacts

    New Traffic Pattern - Mineral Avenue

    Both directions of traffic on Mineral Avenue from just west of Santa Fe Drive (US Highway 85) to west of Platte River Parkway have been shifted to the north side of the roadway into a two-way, single lane alignment. The following impacts and restrictions are in place until further notice:

    • The traffic signals at the Platte River Parkway and Mineral Avenue intersection have been removed.
    • No Eastbound Mineral Avenue Left Turns: No left turns are permitted to and from Platte River Parkway on eastbound Mineral Avenue. 
    • Eastbound Mineral Avenue Detour Routes: Signs will direct motorists to Aspen Grove and Santa Fe Drive to bypass the restrictions.
    • Right turns to and from Platte River Parkway on westbound Mineral Avenue remain in place.
    • No u-turns are permitted within the work zone.
    • Please refer to the map below for the location, impacts and detours.
    • The speed limit on Mineral Avenue is 45 mph.
    • Please drive slowly, stay alert, merge when directed, and follow all posted signs. 
    • Visit Cone Zone for more details. 

    Shoulder Closure - Santa Fe Drive (US 85) 

    • The right shoulder on southbound Santa Fe Drive is closed 24/7 until late June.
    • The project limits on Santa Fe Drive extend a half-mile north and south of the Mineral Avenue intersection, from Mile Point 201 to MP 202 in the City of Littleton.
    • A speed limit of 50 mph is in place on Santa Fe Drive.
    • Check the Cone Zone Page or COtrip.org for details. 

    About the Project

    • The project began in late 2025 with anticipated completion by fall 2027.
    • Normal working hours are 7 a.m. to 5 p.m. Monday to Friday.
    • Some overnight work will take place from 7 p.m. to 5 a.m.
    • Work includes building a quadrant roadway and roundabout; widening Santa Fe Drive and Mineral Avenue; adding new lane configurations; installing new traffic signals; and making mobility and safety improvements.

    Stay Connected!

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    05-14-2026 - Project Update

    This update includes an upcoming holiday schedule, construction progress, planned work, and ongoing traffic impacts for the next few weeks for the Santa Fe and Mineral Improvements project in Arapahoe County.

    Memorial Day Weekend: No work will be performed from Saturday, May 23 through Monday, May 25 in observance of Memorial Day.

    A new traffic pattern is in place on Mineral Avenue and a 24/7 right shoulder closure exists on southbound Santa Fe Drive within the project limits. Please refer to the Traffic Impacts section below for more details.

    We appreciate the public's continued cooperation and adherance to new lane restrictions and detours during this important phase of construction. 

    Drone views of construction progress on the new quad roadway and roundabout. Aerial photography by HDR, Inc. and SEMA.

    Construction Progress & Planned Work

    Since the last update, crews have started clearing the west side of Santa Fe Drive for widening and begun construction on the now-closed portion of the south side of Mineral Avenue that, when complete, will connect to the quad roadway extension.

    Crews have made significant progress on the quad roadway extension and roundabout in recent weeks, installing new concrete curb and gutter and preparing the road surface for asphalt paving. Other work included the removal of existing streetlights and construction of new light bases, and utility construction including installing electrical and fiber conduit.

    Over the next few weeks, crews will continue performing concrete flatwork at the roundabout and Platte River Parkway extension, and asphalt pave sections of the new roadway. Other planned work includes cutting and filling embankment areas on the west side of Santa Fe Drive; clearing and grubbing and removing old concrete and asphalt on Mineral Avenue; and installing new drainage pipe and inlet structures.

    Views of new curb and gutter for the new quad roadway extension of Platte River Parkway and the Mineral Avenue traffic shift. Photography by Estate Media.

    Traffic Impacts

    New Traffic Pattern - Mineral Avenue 

    Both directions of traffic on Mineral Avenue from just west of Santa Fe Drive (US Highway 85) to west of Platte River Parkway have been shifted to the north side of the roadway into a two-way, single lane alignment. The following impacts and restrictions are in place until further notice:

    • The traffic signals at the Platte River Parkway and Mineral Avenue intersection have been removed.
    • No Eastbound Mineral Avenue Left Turns: No left turns are permitted to and from Platte River Parkway on eastbound Mineral Avenue.
    • Eastbound Mineral Avenue Detour Routes: Signs will direct motorists to Aspen Grove and Santa Fe Drive to bypass the restrictions.
    • Right turns to and from Platte River Parkway on westbound Mineral Avenue remain in place.
    • No u-turns are permitted within the work zone.
    • Please refer to the map below for the location, impacts and detours.
    • Please drive slowly, stay alert, merge when directed, and follow all posted signs. 
    • The speed limit on Mineral Avenue is 45 mph.
    • Changing conditions exist and caution is advised.
    • Visit Cone Zone for more details.       


    Shoulder Closure - Santa Fe Drive (US 85) 

    • The right shoulder on southbound Santa Fe Drive is closed 24/7 until late June.
    • The project limits on Santa Fe Drive extend a half-mile north and south of the Mineral Avenue intersection, from Mile Point 201 to MP 202 in the City of Littleton.
    • A speed limit of 50 mph is in place on Santa Fe Drive.
    • Check the Cone Zone page or COtrip.org for details. 

    About the Project

    • The project began in late 2025 with anticipated completion by fall 2027.
    • Normal working hours are 7 a.m. to 5 p.m. Monday to Friday.
    • Some overnight work will take place from 7 p.m. to 5 a.m.
    • Work includes building a quadrant roadway and roundabout; widening Santa Fe Drive and Mineral Avenue; adding new lane configurations; installing new traffic signals; and making mobility and safety improvements.                               

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    05-01-2026 - New Date - Travel Advisory

    This notification confirms the new start date for the Mineral Avenue traffic shift that was previously scheduled to begin on April 27 but was postponed due to weather.

    We appreciate the public’s patience as we enter another important phase of the project. If possible, alternative routes that avoid the project area are highly encouraged during this temporary traffic pattern.

    Starting May 2 - Mineral Avenue Traffic Shift

    Starting at 7 p.m. on Saturday, May 2 and lasting until further notice, both directions of traffic on Mineral Avenue from just west of the Santa Fe Drive (US Highway 85) intersection to west of Platte River Parkway will be shifted to the north side of the roadway into a two-way, single-lane alignment.

    To accommodate this reduced alignment and keep east-west traffic flowing, the traffic signals at the Platte River Parkway and Mineral Avenue intersection will be removed, with north-south access limited to right turn lanes only to and from westbound Mineral Avenue. Detour routes will be posted to access eastbound Mineral Avenue via Aspen Grove and Santa Fe Drive.

    This temporary traffic pattern will remain in place while crews widen the south portion of the roadway and make traffic signal and pedestrian improvements as part of the Santa Fe and Mineral Improvements project.

    Location and configuration of the Mineral Avenue traffic shift and related impacts.

    Traffic Impacts

    The following impacts will be in place during the Mineral Avenue traffic shift:

    • Starting the evening of Saturday, May 2, both directions of traffic on Mineral Avenue from west of the Santa Fe Drive intersection to west of South Platte River Parkway, will be shifted north and reduced to a two-way single-lane alignment.
    • The shift will be implemented during overnight hours (7 p.m. to 7 a.m.) on Saturday, May 2 and in place from 7 a.m. on Sunday, May 3 until further notice. 
    • Uniformed traffic control personnel will be present during the overnight shift to manage traffic flows and maintain safety.
    • The traffic signals at the Platte River Parkway and Mineral Avenue intersection will be removed to maintain east-west traffic flows.
    • Southbound Platte River Parkway at Mineral Avenue will be reduced to a single right turn lane onto westbound Mineral Avenue. No left turns will be permitted.
    • Access to eastbound Mineral Avenue to and from Platte River Parkway will be via Aspen Grove and Santa Fe Drive, with detours posted.
    • Access to northbound Platte River Parkway from westbound Mineral Avenue will remain in place.
    • Please refer to the map above for the location and configuration of the traffic shift, related impacts and detour routes.
    • Delays can be expected and alternate routes are strongly advised.
    • Please exercise caution and drive slowly while motorists get used to the reduced alignment and restricted turn lanes.
    • A speed limit of 45 mph is in place on Mineral Avenue.
    • The project limits on Mineral Avenue extend from west of Platte River Parkway to east of the Santa Fe Drive intersection.
    • Message boards, signs and construction devices will be present to alert the public to the closures and work zone restrictions.
    • Follow traffic impacts at LittletonCO.gov/ConeZone.

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April 2026

    04-28-2026 - Updated Travel Advisory

    Postponed - Mineral Avenue Traffic Shift

    The scheduled overnight traffic shift on Monday, April 27 was postponed due to weather and related safety concerns. A notification will be sent out once a new date has been confirmed.

    We appreciate the public's continued cooperation and patience during this temporary delay. 

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    04-22-2026 - Travel Advisory Reminder

    We appreciate the public’s patience as we enter another important phase of the project. If possible, alternative routes that avoid the project area are highly encouraged during this temporary traffic pattern.

    Starting April 27 - Mineral Avenue Traffic Shift

    Starting on Monday night, April 27 and lasting until further notice, both directions of traffic on Mineral Avenue from just west of the Santa Fe Drive (US Highway 85) intersection to west of Platte River Parkway will be shifted to the north side of the roadway into a two-way, single-lane alignment.

    To accommodate this reduced alignment and keep east-west traffic flowing, the traffic signals at the Platte River Parkway and Mineral Avenue intersection will be removed, with north-south access limited to right turn lanes only to and from westbound Mineral Avenue. Detour routes will be posted to access eastbound Mineral Avenue via Aspen Grove and Santa Fe Drive.

    This temporary traffic pattern will remain in place while crews widen the south portion of the roadway and make traffic signal and pedestrian improvements as part of the Santa Fe and Mineral Improvements project.

    Location and configuration of the Mineral Avenue traffic shift and related impacts.

    Traffic Impacts

    The following impacts will be in place during the Mineral Avenue traffic shift:

    • Starting on Monday night, April 27, both directions of traffic on Mineral Avenue from west of the Santa Fe Drive intersection to west of South Platte River Parkway, will be shifted north and reduced to a two-way single-lane alignment.
    • The shift will be implemented during overnight hours on Monday, April 27 and in place from 7 a.m. on Tuesday, April 28 until further notice. 
    • Uniformed traffic control personnel will be present during the overnight shift to manage traffic flows and maintain safety.
    • The traffic signals at the Platte River Parkway and Mineral Avenue intersection will be removed to maintain east-west traffic flows.
    • Southbound Platte River Parkway at Mineral Avenue will be reduced to a single right turn lane onto westbound Mineral Avenue. No left turns will be permitted.
    • Access to eastbound Mineral Avenue to and from Platte River Parkway will be via Aspen Grove and Santa Fe Drive, with detours posted.
    • Access to northbound Platte River Parkway from westbound Mineral Avenue will remain in place.
    • Please refer to the map above for the location and configuration of the traffic shift, related impacts and detour routes.
    • Delays can be expected and alternate routes are strongly advised.
    • Please exercise caution and drive slowly while motorists get used to the reduced alignment and restricted turn lanes.
    • A speed limit of 45 mph is in place on Mineral Avenue.
    • The project limits on Mineral Avenue extend from west of Platte River Parkway to east of the Santa Fe Drive intersection.
    • Message boards, signs and construction devices will be present to alert the public to the closures and work zone restrictions.
    • Follow traffic impacts at LittletonCO.gov/ConeZone.

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    04-21-2026 - Traffic Impacts

    Traffic Impacts - Santa Fe Drive
    Week of April 26

    Please be advised of the following scheduled traffic impacts on Santa Fe Drive (US Highway 85) for next week for the Santa Fe and Mineral Improvements project in the City of Littleton.

    These overnight traffic impacts on Santa Fe Drive will be implemented concurrently with the Mineral Avenue traffic shift from west of the Santa Fe Drive intersection to west of Platte River Parkway on Sunday, April 26. Once implemented, a 24/7 shoulder closure on southbound Santa Fe Drive will be in place along with a reduced alignment on Mineral Avenue.

    Delays can be expected and alternate routes are strongly advised. We appreciate the public's cooperation and patience as we enter a new phase of work for this important infrastructure project.

    Traffic Impacts - Southbound Santa Fe Drive (US 85)

    Sunday, April 26 to Monday, April 27 - Southbound Santa Fe Drive - single overnight lane closure followed by 24/7 right shoulder closure.

    • Starting at 7 p.m. on Sunday, April 26 and lasting until 6 a.m. on Monday, April 27, a single lane closure will be in place on southbound Santa Fe Drive.
    • Uniformed traffic control personnel will be present to manage traffic flows and to maintain safety.
    • The right turn lane from eastbound Mineral Avenue to southbound Santa Fe Drive will be closed during this overnight period, with detours posted. 
    • Detour routes include heading eastbound on Mineral Avenue to Broadway or Southpark to bypass the closure.
    • Other detour routes do exist.
    • Right turn restrictions will be removed by 6 a.m. on Monday, April 27.
    • The right shoulder on southbound Santa Fe Drive will be closed 24/7 starting at 7 a.m. on Monday, April 27 until late June.
    • The project limits on Santa Fe Drive extend a half-mile north and south of the Mineral Avenue intersection, from Mile Point 201 to MP 202 in the City of Littleton.
    • Delays can be expected and alternate routes are advised.
    • Speed limits of 45 to 50 mph exist on Santa Fe Drive.
    • Please observe posted signs and exercise caution when driving through the work zone.
    • Check the Cone Zone Page or COtrip.org for scheduled traffic impacts.

    Work includes setting barrier and preparing the shoulder for a 24/7 closure.

    About the Project

    • The project began in late November 2025 with anticipated full completion by fall 2027.
    • Normal working hours are 7 a.m. to 5 p.m. Monday to Friday.
    • Some overnight work will take place from 7 p.m. to 5 a.m.
    • Work includes building a quadrant roadway and roundabout, widening Santa Fe Drive and Mineral Avenue, adding new lane configurations, installing new traffic signals, and making area mobility and safety improvements.

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    04-17-2026 - Postponed Traffic Impacts

    The previously scheduled lane and shoulder closures on southbound Santa Fe Drive (US Highway 85) from Sunday, April 19 to Saturday, April 25 have been postponed until further notice. A notification will be sent out once new dates have been confirmed.

    About the Project

    • The project began in late November 2025 with anticipated full completion by fall 2027.
    • Normal working hours are 7 a.m. to 5 p.m. Monday to Friday.
    • Some overnight work will take place from 7 p.m. to 5 a.m.
    • Work includes building a quadrant roadway and roundabout, widening Santa Fe Drive and Mineral Avenue, adding new lane configurations, installing new traffic signals, and making area mobility and safety improvements. 

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    04-13-2026 - Travel Advisory

    Travel Advisory

    We appreciate the public’s patience as we enter another important phase of the project. If possible, alternative routes that avoid the project area are highly encouraged during this temporary traffic pattern.

    Starting April 27 - Mineral Avenue Traffic Shift

    Starting on Monday night, April 27 and lasting until further notice, both directions of traffic on Mineral Avenue from just west of the Santa Fe Drive (US Highway 85) intersection to west of Platte River Parkway will be shifted to the north side of the roadway into a two-way, single-lane alignment.

    To accommodate this reduced alignment and keep east-west traffic flowing, the traffic signals at the Platte River Parkway and Mineral Avenue intersection will be removed, with north-south access limited to right turn lanes only to and from westbound Mineral Avenue. Detour routes will be posted to access eastbound Mineral Avenue via Aspen Grove and Santa Fe Drive.

    This temporary traffic pattern will remain in place while crews widen the south portion of the roadway and make traffic signal and pedestrian improvements as part of the Santa Fe and Mineral Improvements project.

    Location and configuration of the Mineral Avenue traffic shift.

    Traffic Impacts

    The following impacts will be in place during the Mineral Avenue traffic shift:

    • Starting on Monday night, April 27, both directions of traffic on Mineral Avenue from west of the Santa Fe Drive intersection to west of South Platte River Parkway, will be shifted north and reduced to a two-way single-lane alignment.
    • The shift will be implemented during overnight hours on Monday, April 27 and in place from 7 a.m. on Tuesday, April 28 until further notice. 
    • The traffic signals at the Platte River Parkway and Mineral Avenue intersection will be removed to maintain east-west traffic flows.
    • Southbound Platte River Parkway at Mineral Avenue will be reduced to a single right turn lane onto westbound Mineral Avenue. No left turns will be permitted.
    • Access to eastbound Mineral Avenue to and from Platte River Parkway will be via Aspen Grove and Santa Fe Drive, with detours posted.
    • Access to northbound Platte River Parkway from westbound Mineral Avenue will remain in place.
    • Please refer to the map for the location and configuration of the traffic shift.
    • Delays can be expected and alternate routes are strongly advised.
    • Please exercise caution and drive slowly while motorists get used to the reduced alignment and restricted turn lanes.
    • A speed limit of 45 mph is in place on Mineral Avenue.
    • The project limits on Mineral Avenue extend from west of Platte River Parkway to east of the Santa Fe Drive intersection.
    • Signs and construction devices will be present to alert the public to the closures and work zone restrictions.
    • Follow traffic impacts at LittletonCO.gov/ConeZone.

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    04-13-2026 - Traffic Impacts

    Scheduled Traffic Impacts - April

    Please be advised of the following scheduled traffic impacts for this month for the Santa Fe and Mineral Improvements project in the City of Littleton.

    A separate Travel Advisory will be issued announcing the upcoming traffic shift on Mineral Avenue. Notifications will be sent out if there are any changes to the schedule. 

    Traffic Impacts - Santa Fe Drive (US Highway 85)

    Sunday, April 19 to Monday, April 20 - Southbound Santa Fe Drive - single overnight lane closure & 24/7 right shoulder closure.

    • Starting at 7 p.m. on Sunday, April 19 and lasting until 6 a.m. on Monday, April 20 a single lane closure will be in place on southbound Santa Fe Drive, with signs and devices present to maintain safety.
    • The right shoulder on southbound Santa Fe Drive will be closed 24/7 starting at 7 a.m. on Monday, April 20 until late June.
    • The project limits on Santa Fe Drive extend a half-mile north and south of the Santa Fe Drive and Mineral Avenue intersection, from Mile Point 201 to MP 202 in the City of Littleton.
    • Delays can be expected and alternate routes are advised.
    • A speed limit of 50 mph is in place on Santa Fe Drive.
    • Check the Cone Zone Page or COtrip.org for scheduled traffic impacts.
    • Work includes setting barrier and preparing the shoulder for a 24/7 closure.

    Travel Advisory - Mineral Avenue - Traffic Shift

    Monday, April 27 until further notice - Mineral Avenue from west of Santa Fe Drive intersection to west of Platte River Parkway - traffic shift north into two-way single-lane alignment.

    • Starting on Monday night, April 27, both directions of traffic on Mineral Avenue from west of the Santa Fe Drive intersection to west of South Platte River Parkway, will be shifted north and reduced to a two-way single-lane alignment.
    • The shift will be implemented during overnight hours on Monday, April 27 and in place from 7 a.m. on Tuesday, April 28 until further notice. 
    • The traffic signals at the Platte River Parkway and Mineral Avenue intersection will be removed to maintain east-west traffic flows.
    • Southbound Platte River Parkway at Mineral Avenue will be reduced to a single right turn lane onto westbound Mineral Avenue. No left turns will be permitted.
    • Access to eastbound Mineral Avenue to and from Platte River Parkway will be via Aspen Grove and Santa Fe Drive, with detours posted.
    • Access to northbound Platte River Parkway from westbound Mineral Avenue will remain in place.
    • Please refer to the map for the location and configuration of the traffic shift.
    • Delays can be expected and alternate routes are strongly advised.
    • Please exercise caution and drive slowly while motorists get used to the reduced alignment and restricted turn lanes.
    • A speed limit of 45 mph is in place on Mineral Avenue.
    • The project limits on Mineral Avenue extend from west of Platte River Parkway to east of the Santa Fe Drive intersection.
    • Signs and construction devices will be present to alert the public to the closures and work zone restrictions.
    • Follow traffic impacts at LittletonCO.gov/ConeZone.

    Work includes widening the south side of Mineral Avenue and making traffic signal and pedestrian accessibility improvements.

    Map of the location and configuration of the Mineral Avenue traffic shift.

    About the Project

    • The project began in late November 2025 with anticipated full completion by fall 2027.
    • Normal working hours are 7 a.m. to 5 p.m. Monday to Friday.
    • Some overnight work will take place from 7 p.m. to 5 a.m.
    • Work includes building a quadrant roadway and roundabout, widening Santa Fe Drive and Mineral Avenue, adding new lane configurations, installing new traffic signals, and making area mobility and safety improvements. 

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    04-06-2026 - Project Update

    This update includes upcoming traffic impacts and other status notifications, as well as construction progress and planned work for the next few weeks for the Santa Fe and Mineral Improvements project in Arapahoe County.  

    Upcoming Traffic Impacts: Starting in mid-April, the right shoulder on southbound Santa Fe Drive (US Highway 85) will be closed 24/7 for access to the work zone.

    In addition, starting later this month or in early May, work will begin on Mineral Avenue west of the Santa Fe intersection, with some traffic impacts expected. A notification will be sent out once dates are confirmed.

    Cancelled Traffic Shifts on Santa Fe Drive: The previously scheduled traffic shifts and reduced alignments in both directions of Santa Fe Drive have been cancelled. A notification will be sent out with any changes to the schedule.

    Since the last update, crews have made significant progress fine grading and forming and pouring curb and gutter for the new quad roadway extension of Platte River Parkway in the southwest quadrant of the project limits. Other work included forming and pouring the toe wall for the concrete box culvert; placing concrete pipe and inlets for the new drainage system; installing electrical conduit; and excavating adjacent areas.

    Planned work on the new quad roadway over the next few weeks includes continued forming and pouring concrete curb and gutter; forming sidewalks; installing median covers; and concrete and asphalt paving. Other scheduled activities sitewide include drilling light pole caissons, installing electrical conduit, and placing concrete storm drainage pipe and inlet structures.

    Drone view of roundabout construction for the quad roadway. Aerial photography by HDR, Inc.


    Ground views of graded roadway, roundabout construction, and curb and gutter for the new quad roadway extension of Platte River Parkway. Photography by Estate Media.

    About the Project

    • The project began in late November 2025 with anticipated full completion by fall 2027.
    • Normal working hours are 7 a.m. to 5 p.m. Monday to Friday.
    • Some overnight work will take place from 7 p.m. to 5 a.m.
    • Work includes building a quadrant roadway and roundabout; widening Santa Fe Drive and Mineral Avenue; adding new lane configurations; installing new traffic signals; and making mobility and safety improvements.

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March 2026

    03-05-2026 - Project Update

    This update includes an amended upcoming travel advisory as well as construction progress and planned work for the next few weeks for the Santa Fe and Mineral Improvements project in Arapahoe County.  

    Amended Upcoming Travel Advisory: The planned traffic shifts and temporary realignment of both directions of traffic on Santa Fe Drive (US Highway 85) for this month have been postponed. The reason for the postponement is to minimize further impacts to the traveling public.

    A notification will be sent out in advance of confirmation of the traffic shifts or any scheduled traffic impacts for the project. 

    Since the last update, crews have made significant progress excavating, placing road base and grading the new quad roadway extension of Platte River Parkway in the southwest quadrant of the project limits. Other work included forming and pouring the toe wall for the concrete box culvert and installing concrete pipe and inlets for the new drainage system.

    Planned work on the new quad roadway over the next few weeks includes fine grading; forming and pouring concrete curb and gutter; installing median covers; and paving. Other scheduled activities include ongoing installation of storm drainage pipe and inlet structures, and excavating adjacent areas. 

    North drone view of the new quad roadway extension of Platte River Parkway. Aerial photography by HDR, Inc.

    Ground view of the new quad roadway Platte River Parkway extension. Photography by Estate Media.


    About the Project

    • The project began in late November 2025 with anticipated full completion by fall 2027.
    • Normal working hours are 7 a.m. to 5 p.m. Monday to Friday.
    • Some overnight work will take place from 7 p.m. to 5 a.m.
    • Work includes building a quadrant roadway and roundabout; widening Santa Fe Drive and Mineral Avenue; adding new lane configurations; installing new traffic signals; and making mobility and safety improvements.

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February 2026

    02-19-2026 - Project Update

    This update includes notice of an upcoming travel advisory as well as construction progress and planned work for the Santa Fe and Mineral Improvements project in Arapahoe County.  

    Upcoming Travel Advisory: Starting within the next month, both directions of traffic on Santa Fe Drive (US Highway 85) within the project limits will be shifted east into a temporary alignment to accommodate widening and other work on the west side of the work zone. The shift will take place over a two-night period, with lane closures in place and delays expected. Once implemented, two through lanes and a dedicated single left turn lane will remain in place in both directions of Santa Fe Drive until further notice. A notification will be sent once dates are confirmed.

    Since the last update, crews have finished backfilling and waterproofing the concrete box culvert and have begun installing concrete pipe and inlets for the new drainage system. Ongoing work includes excavating for the new quad roadway, and removing asphalt and concrete on Mineral Avenue west of the Santa Fe Drive intersection.

    Planned work over the next two weeks includes excavating and placing road base for the new quad roadway, installing drainage pipe and inlets, and building embankment areas. Other work includes preparing for the traffic shift, removing asphalt and concrete, and replacing the traffic signals at Mineral and Platte River Parkway with three-way stop signs. These signs will remain in place until further notice.

    Recent view of the concrete box culvert and excavation for the new quad roadway. Photography by Estate Media.


    About the Project

    • The project began in late November 2025 with anticipated full completion by fall 2027.
    • Normal working hours are 7 a.m. to 5 p.m. Monday to Friday.
    • Some overnight work will take place from 7 p.m. to 5 a.m.
    • Work includes building a quadrant roadway and roundabout; widening Santa Fe Drive and Mineral Avenue; adding new lane configurations; installing new traffic signals; and making mobility and safety improvements.

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January 2026

    01-21-2026 - Project Update

    Starting on Thursday, Jan. 22, 2026 and lasting until about 5 p.m. on Friday, Jan. 30, the City of Littleton and the Colorado Department of Transportation will close the far left turn lane from northbound Santa Fe Drive (US HIghway 85) to westbound Mineral Avenue and close the left lanes in both directions of Mineral Avenue within the project limits. These traffic impacts will remain in place during the nine-day period as part of the Santa Fe and Mineral Improvements project.  

    The closures are necessary so crews can remove portions of the existing median and begin widening and traffic signal improvements on the west side of the project corridor at the Platte River Parkway and Mineral intersection.

    Other work underway sitewide includes backfilling and waterproofing the newly installed concrete box culvert in the southwest portion of the project, installing storm drainage pipe and inlets, potholing, and starting excavation for the new quad roadway.

    Traffic Impacts 

    Thursday, Jan. 22 to Friday, Jan. 30 - Left turn lane closure from north-bound Santa Fe Drive to westbound Mineral Avenue & left lane closures in both directions of Mineral Avenue.

    • The far left turn lane on northbound Santa Fe Drive to westbound Mineral Avenue will be closed from approximately 7 a.m. on Thursday, Jan. 22 to 5 p.m. on Friday, Jan. 30. The second left turn lane will remain open.
    • Left lane closures will also be in place in both directions of Mineral Avenue within the project limits during this nine-day period, reducing traffic to a two-way, single lane alignment. 
    • The closures will remain in place 24 hours a day.
    • Please refer to the map for lane closure information.
    • The project limits on Santa Fe Drive extend from Mile Point 201 to MP 202, approximately half a mile south to half a mile north of the Mineral Avenue intersection.
    • The project limits on Mineral Avenue extend from west of Platte River Parkway to east of the Santa Fe Drive intersection.
    • Signs and construction devices will be present to alert the public to the closures and work zone restrictions and to maintain safety.
    • Delays can be expected and caution is advised.
    • Visit LittletonCO.gov/ConeZone for traffic impacts.

    Work includes removing asphalt and concrete, and performing traffic signal and utility work at the Platte River Parkway and Mineral Avenue intersection.

    Location of the lane closures that will be in place from Jan. 22 to Jan. 30 for the City of LIttleton's Santa Fe and Mineral Improvements project. 

    About the Project

    • The project began in late November 2025 with anticipated full completion by fall 2027.
    • Normal working hours are 7 a.m. to 5 p.m. Monday to Friday.
    • Some overnight work will take place from 7 p.m. to 5 a.m.
    • Work includes building a quadrant roadway and roundabout, widening Santa Fe Drive and Mineral Avenue, adding new lane configurations, installing new traffic signals, and making mobility and safety improvements sitewide. 

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