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Public Works

US 85 Widening from Highlands Ranch Parkway to C-470



Total 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

Subscribe and Receive Updates. View additional closure and schedule information in “Schedule” section below.

Construction on this project began on Oct. 3, 2022. Drivers should expect to see workers and heavy equipment during the day between 7 a.m. and 7 p.m. with daytime lane closures between 9 a.m. and 3 p.m. on weekdays. Overnight lane closures on US 85 and C-470 are expected from 7 p.m. to 5:30 a.m. on weeknights.

Please watch for crews, slow down, and avoid distracted driving in the work zone.


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


Full Closure of eastbound C-470 to US 85 (Santa Fe Drive): On Thursday, Dec. 8 starting at 9 p.m. until Monday, Dec. 12 until 6 a.m., there will be a full closure at this off-ramp for ramp reconstruction while crews relocate an underground water line that provides drinking water to the City of Englewood. Weather Dependent – if weather delays this work, it will be rescheduled to Dec. 15-19. Click here for news release and detour information.

Business Access Changes
For safety reasons, business access is permanently changing 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 will no longer be allowed. These changes will continue to be implemented during overnight operations Friday, Dec. 2, and Sunday, Dec. 4. Access changes will be fully implemented the morning of Monday, Dec. 5. View business access changes.

Left-turn access changing on US 85 

Week of Dec. 4 – 10:

  • Single lane closures on northbound and southbound US 85 daily from 9 a.m. to 3 p.m. Monday through Friday throughout the corridor.
  • Full closure of eastbound C-470 off-ramp to US 85 from 9 p.m. (Dec. 8) to 6 a.m. (Dec. 12).
  • Northbound and southbound US 85 single lane closures from County Line Road to Blakeland Drive overnight Monday through Friday from 9 p.m. to 5:30 a.m.
  • Trail closures continue at US 85 along the C-470, High Line Canal and Highlands Ranch trails.

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.

C-470 and High Line Canal trail detoursposted Nov. 2, 2022

Ramp Closures:

  • Southbound US 85 off-ramp to eastbound C-470 closed starting Nov. 1, and this closure will continue into 2023. Detour Route: Wolhurst residents may use County Line Road to Lucent Boulevard to access eastbound C-470 or utilize the southbound US 85 flyover. Please watch for crews, slow down, and avoid distracted driving in the work zone.

Project Photos