Boulder County Public Works manages construction projects in unincorporated Boulder County for roads, bridges, multi-use pathways, and drainages.
Construction-Related Travel Impacts
Baseline Road Bridge Replacement – Full Closure of Baseline Road Starts Aug. 24
Baseline Road will be closed between Cherryvale Road and 75th Street from Monday, Aug. 24 through October for a bridge replacement project at Dry Creek. Residents west Dry Creek will be able to access their homes from Cherryvale, while resident east of Dry Creek will access their homes from 75th and 76th streets. The City of Boulder’s Dry Creek Trailhead and trail will also be closed during the bridge replacement. Learn more about the Baseline Bridge Replacement project.
Chip Seal Project Underway on Roads in Northern Boulder County
Road Maintenance has started start chip sealing work on several roads north of Highway 66. This work will result in lane closures and reduced speeds during daytime, weekday working hours, which are 7 a.m. to 4 p.m., Monday through Thursday, through August. Please maintain posted speed limits to avoid getting oil on vehicles from freshly sealed roads. Cyclists are encouraged to avoid freshly sealed roads as the surface will be rough until chips are compacted and excess material is swept. Striping work will follow chip sealing work. Learn more about chip sealing.
75th Street Electrical Undergrounding Project – Expect travel delays
Xcel Energy is undergrounding overhead lines along 75th Street between Lookout and Valmont roads. Expect daytime, weekday travel delays. Flaggers will be used to guide cars and bikes around work zones. Work is expected to last through the summer. Learn more about Xcel’s project.
120th Street Reconstruction in Progress – Full Roadway into October
Phase 1 of the 120th Street Reconstruction Project has ended. Phase 2 of the project started May 26. This phase will require a full-time closure of 120th Street in both directions between the southern entrance to Rock Creek Circle and Dillon Road. The closure will be in place through October. Detours will be established to CO 287. Learn more about the 120th Street Reconstruction Project.
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