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Public Works

US 85 Widening from Highlands Ranch Parkway to C-470

Under Construction

Budget

Total Approximate Construction Cost = $108 Million

Project Manager

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

Contractor

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

Partners

  • 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 May 13, 2025

Crews will be paving the top layer of the new roadway throughout the month of May. Impactful lane closures, intermittent turn restrictions at signalized intersections and temporary traffic holds up to 20 minutes will be in place during paving.

Wednesday, May 14, and if needed, Thursday, May 15, from 5 a.m. until 8 p.m.

  • Northbound and southbound US 85 traffic single-lane closures intermittently, intersection turn restrictions and driveway access closures.

A weekend-long full closure of US 85 between Blakeland Drive and County Line Road and the C-470 on- and off-ramps will take place from 8 p.m. Friday, May 16, until 5 a.m. Monday, May 19, to pave the roadway on the new bridge and connecting ramps.

  • Full closure of US 85 over C-470, between Blakeland Drive and County Line Road. View detour map
  • No access to/from C-470 at US 85, all on- and off-ramps will be closed. View detour map

Motorists are advised to avoid the area and provide additional time to navigate impacts. 

Watch a video to see how CFIs work

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

Description

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

Schedule

May 11 – May 17

Major Impacts: 

  • Saturday, May 10 from 5 a.m. until 8 p.m.
    • Northbound US 85 reduced to a single lane, project-wide, beginning at Highlands Ranch Parkway.
  • Sunday, May 11 from 5 a.m. until 8 p.m.
    • Southbound US 85 reduced to a single lane, project-wide, beginning north of County Line Road.
  • Monday, May 12 and Tuesday, May 13 from 5 a.m. until 3 p.m.
    • Northbound and southbound US 85 traffic is restricted to a single lane intermittently, with intersection turn restrictions and driveway access closures.
  • Wednesday, May 14, and if needed, Thursday, May 15, from 5 a.m. until 8 p.m.
    • Northbound and southbound US 85 traffic single-lane closures intermittently, intersection turn restrictions and driveway access closures.
  • 8 p.m. Friday, May 16 until 5 a.m. Monday, May 19
    • Full closure of US 85 over C-470, between Blakeland Drive and County Line Road. View detour map.
    • No access to/from C-470 at US 85, all on- and off-ramps will be closed. View detour map.

Daily Impacts:

  • No daily impacts.

Please give yourself extra time and pay attention to posted speed limits and signage. If weather conditions do not allow this work to take place as originally scheduled, crews will conduct this work at a later date.

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