Boulder County Transportation manages the construction projects for roads, bridges, pathways, drainage improvements and trails. The projects listed on this page are related to flood recovery and regularly scheduled roadway maintenance.
Construction-Related Travel Impacts
Use the Road Service Request Form to let us know about an issue on area roads.
Travel Impacts
County Road Projects
N. 57th Street Traffic Calming Project
On Monday, Sept. 28, work will begin to help mitigate vehicle speeds on N. 57th Street between Independence and Jay roads. Boulder County Road Maintenance crews will be working on the intersection of Woodbourne Hollow Road and N. 57th Street, and they will also install three speed tables along the road. The goal of this project is to help control excessive speeding along this county road. Work will take place between 7 a.m. and 4:30 p.m., Monday through Thursday. Travelers along the road can expect to see lane closures and traffic shifts. A full road closure may be necessary to perform certain aspects of the work. The project is anticipated to last into November.
US 287 & Isabelle Road Intersection Safety Improvements Project
- Starts November 2020
- 8 a.m. to 4:30 p.m., Monday through Friday
- Lane closures and traffic shifts on US 287 and on Isabelle Road
- Expect delays – Alternate routes advised
- Project anticipated to last until March 2021
- Project Website
Longmont East County Line Construction Project
- City of Longmont reconstructing East County Line Road between 9th and 17th avenues
- July 2020 to April 2021
- Expect travel delays – Alternate Routes Advised
- Project Website
Thank you for following restrictions! We apologize for any inconvenience.
For more information about Boulder County road travel impacts, please contact – Andrew Barth – 303-441-1032
Projects Impacting Cycling
OLDE STAGE ROAD reduced to a single lane in two locations
- Olde Stage Road construction requiring flaggers during daytime, weekday working hours
- Expect work to last through August
South Boulder Road Emergency Repairs – Aug. 17 to Aug. 28
- Emergency concrete panel replacement on South Boulder Road (SBR) between 55th Street and Cherryvale Road.
- NO LEFT-TURNS ONTO CHERRYVALE FROM SOUTH BOULDER ROAD 24/7 until work is done
- Expect Delays – lane closures and shifts on South Boulder Road
- Cyclists will need to merge with motor vehicles in the travel lane
- 8 a.m. to 4:30 p.m. – Monday through Friday
- Project anticipated to last through August
- Project website
Thank you for following restrictions! We apologize for any inconvenience.
Project Contact – Andrew Barth – 303-441-1032
Non-County Projects
- S. 120th Street CLOSURE – Sept. 30 to Oct. 14
- City and County of Broomfield project on Dillon Road requires the closure of S. 120th Street for 2-weeks
- Dillon Road will remain open
- Project Website
- SH 119/Boulder Canyon Drive Reconstruction Project – CDOT April 2019 to February 2021
- Expect significant travel delays and roadway closures
- Project hotline = 720-500-9912
- Project email = CDOTCO119@gmail.com
- Text “CO119” to 21000 to receive project alerts
- Special Event Permit Requests – Pending & Approved taking place throughout Boulder County
- Learn about road closures in the City of Boulder at www.BoulderConeZones.net.
- Learn about road closures in Longmont
- Learn about road closures in Lafayette
- Learn about road closures in Louisville
- Learn about road closures in Erie