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Public Works

US 85 Widening from Highlands Ranch Parkway to C-470



Total Approximate Construction Cost = $108 Million

Project Manager

Douglas County / CDOT / Kraemer North America
[email protected]



Kraemer North America
[email protected]



  • Douglas County
  • CDOT
  • Chatfield Basin Developers (Sterling Ranch and Solstice Development)
  • Federal Highway Administration (FHWA)
  • Denver Regional Council of Governments (DRCOG)
  • Highlands Ranch Metro District

Project Update

Updated May 26, 2023

Carder Court Closure at US 85

Carder Court will be fully closed on the west side of US 85 from 6 a.m. Tuesday, May 30, to 5 a.m. Friday, June 2.

  • Southbound US 85 traffic will continue south on US 85 to Midway Drive and turn west. Continue to Division Street and turn north to access Carder Court.  View detour map.

The closure will allow crews to safely remove and replace the existing underground utilities beneath the roadway along US 85. US 85 will not be impacted during this closure. Emergency services access will be maintained.

US 85 Roadway Maintenance

Overnight on Friday, June 2, watch for single lane closures and mobile crews refreshing temporary lane lines on US 85 throughout the corridor.

No traffic impacts will take place over Memorial Day weekend, beginning at noon Friday, May 26, through 6 a.m. Tuesday, May 30.

Project Progress
New bridge beams, called girders, have been set over C-470 to begin construction on the western portion of the new US 85 bridge. View a video of the crane operations that took place last week.

See the “Schedule” section below for more detailed information on traffic impacts. For background information prior to construction, visit


This project will improve safety, mobility, and traffic operations by widening (from four to six lanes) and reconstructing a segment of US 85 (South Santa Fe Drive) from Highlands Ranch Parkway, extending north of  the C-470 Interchange to Dad Clark Gulch (which is located approximately 1,200 feet north of County Line Road). Major US 85 intersection improvements will occur at Highlands Ranch Parkway, Town Center Drive, Blakeland Drive, the C-470 Interchange ramps and at County Line Road. The project also includes the replacement and widening of the existing bridge that carries US 85 over C-470.

Multimodal improvements include bus stop enhancements, a new shared-use path for bicyclists and pedestrians on the east side of US 85, a below-grade crossing for the C-470 Trail at US 85, a below-grade crossing for the High Line Canal Trail at US 85, and a new pedestrian link from the Wolhurst community to the C-470 Trail.

The project also includes the addition of continuous auxiliary lanes, new asphalt paving, relocation of utilities, raised medians, new curb and gutter, and a new closed storm sewer system with water quality ponds.

Timeline: Fall 2022 to Fall 2025

Partial Continuous Flow Intersection (CFI) will be installed for the following traffic movements:

  • Southbound US 85 to Eastbound Highlands Ranch Parkway
  • Southbound US 85 to Eastbound Town Center Drive
  • Northbound US 85 to Westbound C-470

View a map of US 85 Interchange at the above 3 listed intersections.

Other projects along US 85 in Douglas County


Drivers should expect to see workers and heavy equipment during the day between 7 a.m. and 7 p.m. Please watch for crews, slow down, and avoid distracted driving in the work zone.

May 28-June 3:

Daytime impacts:

  • Single lane closures on northbound and southbound US 85 and on the C-470 ramps at US 85 from 9 a.m. to 3 p.m. daily Tuesday, May 30, through Saturday, June 3, throughout the corridor.
  • Full closure of Carder Court on the west side of US 85 from 6 a.m. Tuesday, May 30, to 5 a.m. Friday, June 2.

Nighttime impacts:

  • Single lane closures and mobile striping operations on US 85 throughout the corridor from 8 p.m. to 5:30 a.m. Friday, June 2.

Trail Closures

Three trail closures will stay in place into 2024 while crews install new underpasses to allow pedestrians and bicyclists to safely pass under US 85.

Bus Access: RTD, in partnership with the project team, has closed the Bus Route 402L stops on US 85 between County Line Road and Highlands Ranch Parkway to allow crews to work safely. Though some stops are closed, the Route will remain in service. Customers should sign up for RTD’s Service Alerts and use the Trip Planner app to plan an alternate route.

Business Access has permanently changed to right-in, right-out only at private driveways and un-signalized intersections between Highlands Ranch Parkway and C-470. Left turns at Norwood Drive, Carder Court, Brandon Drive, Grace Presbyterian Church, and Spring Gulch Equestrian Area are no longer allowed. View business access changes.

As always, we ask you to please continue to pay extra attention and follow all posted signage through the construction zone. Expect increased enforcement to ensure the safety of crews and motorists. Pedestrians and bicyclists are not permitted in the work zone – please use signed and signaled intersections to cross US 85.

Project Photos