Under Construction
Traffic Impacts – Week of Sept. 27
The eastbound right lane on County Line Road is closed between Broadway and Phillips Street to continue roadway construction. This lane closure will remain in place until approximately the end of September.
Both eastbound and westbound traffic shifted to the north on the newly paved roadway between E. Phillips Avenue and the Target intersection to construct of the south side of the roadway. One lane of traffic remains open in each direction.
As part of this traffic shift, access to businesses between Clarkson Street and University Boulevard will be available from both directions, except for the Highlands Ranch Plaza entrance, which will only be available travelling eastbound. Access to these businesses remain available at the traffic signal at Circle K.
Due to weather concerns, the County Line Road night closures between Broadway and Phillips Avenue will now begin Sunday, Oct. 4 through Monday, Oct. 5. The closure will be in place from 8 p.m. to 5 a.m. each night and reopened at 5 a.m. each day. Traffic will be detoured at Mineral Avenue, Dry Creek Road, Dad Clark Drive, Clarkson Street and University Boulevard, and business access will remain open. These closures are required for crews to mill the roadway.
Please drive through the area with caution and follow the posted speed limit. Be aware of construction crews, truck traffic and flaggers on the roadway.
Pedestrian Access at Phillips Avenue
Sidewalk improvement work continues along Phillips Avenue near the Wilmore Nursery. A small portion of the sidewalks on the east side of Phillips Avenue between County Line Road and E. Phillips Court remains closed for the construction of new sidewalks. Pedestrians should plan to detour by using the sidewalks on the west side of Phillips Avenue. Cones and signage are in the area to keep pedestrians safe and out of the work zone.
Safety Message
This is an active construction zone. Please drive posted speeds, watch for crews and equipment, and avoid distractions. If you’re traveling through the area, plan ahead, allow extra time and check your navigation app for real-time traffic updates.
We appreciate your patience and cooperation as improvements to County Line Road continue.
Since 2019, Douglas County has worked with partners to advance the final design, acquire right-of-way and prepare utility relocation design for a major water line located within the project area. Douglas County is partnering with the Denver Regional Council of Governments, the City of Littleton and the City of Centennial to fund the project. The total construction cost is estimated to be approximately $30 million for budget planning purposes which includes contingency funds, construction costs and consultant engineering costs to provide project management, inspections, and material testing for the project.
This project will include an additional travel lane in each direction, a new traffic signal at the Clarkson Street/County Line Road intersection, a mill and overlay for the portion of the road within the City of Littleton located between Phillips Avenue and Broadway, as well as adding sidewalks. Construction started in September 2025.