Updated January 22, 2026:
100-Day Closure of County Line Road
The 100-Day Closure of County Line Road began on Tuesday, Jan. 6, 2026. County Line Road is fully closed for approximately 100 days between Clarkson Street and the U-Haul business access. This closure is required for crews to safely import, move and place large quantities of dirt, equal to filling 40,000 washing machines, at Lee Gulch. The fill operations, which are a key component of the widening and reconstruction work, will level out the roadway by removing the dip at Lee Gulch, improving drainage, driver line of sight and overall public safety.
Detours and Access:
Businesses: Business access will remain open via County Line Road.
- Use University Boulevard to reach businesses east of the closure.
- Use Broadway to reach businesses west of the closure.
Residents: Residential access to Clarkson Street will be maintained via Dry Creek and County Line roads.
Commuters: For through trips on County Line Road, use C-470 between University Boulevard and Broadway to navigate around the closure.
Detour Map Detour map for the 100-day closure of County Line Road. Use C-470, University Boulevard, Broadway, Dry Creek Road, and County Line Road to access your destination.
Although crews will not work 24/7, the road cannot be reopened during off-hours due to significant earthwork and unsafe travel conditions during this phase.
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 behind the wheel.
Winter is here! Make sure your car is winter-ready, give yourself plenty of time to get to your destination, allow for extra space between you and the car in front of you and keep a safety kit in your car for emergencies. For more information on winter preparedness, visit CDOT’s Winter Driving website
We appreciate your patience and cooperation as we continue improving County Line Road. Before heading out, check your navigation app for real-time conditions and allow extra time to reach your destination.
Total Project Duration: About 24 months.