Boulder County Public Works manages construction projects in unincorporated Boulder County for roads, bridges, multi-use pathways, and drainages.
Construction-Related Travel Impacts
120th Street Reconstruction Starts April 20 – Full Roadway Closure Required Starting in late-May
Phase 1 of the 120th Street Reconstruction Project will start on Monday, April 20. Expect narrow travel lanes and reduced speeds between Overlook Drive and the south entrance to Rock Creek Circle during this phase of work. Phase 2 of the project is anticipated to start on Monday, May 25. This phase will require a full-time closure of 120th Street in both directions between Overlook Drive and Dillon Road. The closure will be in place for up-to five months, weather permitting. Detours will be established to CO 287. Learn more about the 120th Street Reconstruction Project.
Baseline Road CLOSED at Dry Creek Through April 3
Baseline Road will be closed between Cherryvale Road and North 75th Street until 6 p.m. on Friday, April 3 for a utility relocation project taking place near the Dry Creek Trailhead. Detours will be established. Dry Creek Trailhead will also be closed for this work. This project is part of a larger Public Works bridge replacement effort that will start later this year and will also require a closure of Baseline Road. Learn more about the Baseline Bridge Replacement project.
N. 119th Closed For Culvert Replacement – March 2 through April 16
North 119th Street will be closed to all travelers in both directions between Oxford and Prospect roads starting at 7 a.m. on Monday, March 2 so that Road Maintenance can replace a large culvert structure. Construction and the road closure is anticipated to last through 4 p.m. on Thursday, April 16. Detours will be in place.
CDOT CO 119/Diagonal Highway Safety, Mobility, and Bikeway Construction – UNDERWAY – Expect significant travel impacts
CDOT is currently working on this project, which will require significant travel impacts on CO 119/Diagonal Highway between Boulder and Longmont. This project is anticipated to be completed in the Spring of 2027.
Project Hotline – 720-378-8083
Project Email – co119safetyandmobility@gmail.com
Visit CDOT’s CO 119 project Webpage to learn more and to subscribe to the project email list
Helpful Links
- Special Event Permit Requests – Pending and Approved taking place throughout Boulder County
- Utilize CDOT’s COtrip website to see real time traffic condition updates on state highways
- Learn about road closures in the City of Boulder
- City of Boulder Live Traffic Cameras
- Learn about road closures in Longmont
- Learn about road closures in Lafayette
- Learn about road closures in Louisville
- Learn about road closures in Erie