All County offices will be closed Monday, May 26, in observance of the Memorial Day Holiday. Offices will reopen on Tuesday, May 27, for normal business. Many transactions may be completed online. Visit DoItOnlineDouglas.com to access more than 60 County services 24/7.
Under Construction
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Updated May 23, 2025
The US 85 project team has made substantial progress by completing multiple weeks’ worth of paving operations in just a few days, reducing the overall project schedule. To give the public a break from roadway impacts, there will be no work or traffic impacts over the holiday weekend.
To complete project paving operations, a weekend-long full closure of US 85 is required between the eastbound and westbound C-470 ramp intersections. This closure will take place from 8 p.m. Friday, May 30, until 5 a.m. Monday, June 2.
US 85 full closure over C-470. View detour map
C-470 off-ramp turn restrictions at US 85. 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
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:
View a map of US 85 Interchange at the above 3 listed intersections.
Other projects along US 85 in Douglas County
May 25 – May 31:
Major Impacts:
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.
