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Public Works

US 85 Widening from Highlands Ranch Parkway to C-470

Under Construction


Total Approximate Construction Cost = $108 Million

Project Manager

Douglas County / CDOT / Kraemer North America
[email protected] 719-695-0052


Kraemer North America
[email protected] 719-695-0052


  • 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

Click here to receive updates on this project by email

Updated Feb. 26, 2024

C-470 and US 85 Interchange Reconstruction
It’s demolition day(s) on the US 85 Widening Project! Drivers should plan alternate routes around the interchange of C-470 and Santa Fe March 7-March 13 as crews reach this significant project milestone.

Around-the-clock work and an interchange closure will take place from 7 p.m. Thursday, March 7 until 5:30 a.m. Wednesday, March 13. There will be no C-470 access to or from US 85, and through traffic on C-470 will be delayed as crews safely demolish the old US 85 bridge over C-470.

See the “Schedule” section below for more detailed information on traffic impacts. For background information prior to construction, visit US85DouglasCounty.com


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


March 7- March 13:

Traffic Impacts:

  • Full closures of C-470 between the US 85 off- and on-ramps.
  • Full closure of US 85 between County Line Road and Blakeland Drive in Highlands Ranch.
  • C-470 through traffic will be rerouted around the interchange via the off- and on-ramps. Significant delays expected.

What can you do?

  • If traveling east or west on C-470, expect delays beyond 20 minutes and watch for trucks entering and exiting the work zone. Consider an alternate route.
  • If traveling north or south on US 85, take an alternate route to access C-470.
  • If traveling regionally, take an alternate route around this interchange.
  • Please watch for crews, heavy machinery and trucks entering and exiting the work zone.
  • Heed the speed limit and avoid distracted driving in the work zone.

Detour Maps:

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