- 738 miles of roadway
- 401 miles of paved road (asphalt and concrete)
- 337 miles of gravel road
- Learn more about county roads, bridges and culverts
- 19 traffic signals & 7 school-zone flashing signs
Public Works Department - Building Services, Fleet Services, Resource Conservation, Road Maintenance, and Transportation Engineering
What's New?
East County Line Road Master Plan COMPLETE
Boulder County, in partnership with Longmont, Erie, and Weld County, have completed a master plan that will guide future road work on East County Line Road. Learn more.
71st Street Reconstruction Project
Reconstruction project on 71st Street between Lookout Road and Winchester Circle. Expect daytime, weekday lane closures and traffic shifts. Project anticipated through mid-August 2021. Project webpage
Isabelle Road and US 287 Intersection Improvements Project – Expect daytime, weekday lane closures
The intersection of Isabelle Road and US 287 is currently under construction. Expect daytime, weekday lane closures on Isabelle Road and associated travel delays. Learn more.
Sugarloaf Road Flood Repair Project Starts Spring 2022
Expect lane closures on Sugarloaf Road and on CO 119/Boulder Canyon Drive. Uphill cycling restricted to Sugarloaf-area residents only. Learn more.
Updated No Parking Guidelines Available for Public Comment
No parking guidelines are currently being updated. A draft of the new guidelines is currently available for public comment. Learn more
Traffic Impact Announcements
4th of July Road CLOSED Aug. 3; NO ACCESS TO HESSIE TRAILHEAD – Gravel road resurfacing requires road closure from 6 a.m. to 4:30 p.m. on Tuesday, Aug. 3. See Map
71st Street Culvert and Roadway Improvements Project In Progress – Daytime, weekday travel delays. Project website
US 287 & Isabelle Road Intersection Safety Improvements Project underway – Learn more.
Learn about all current roadway projects and their travel impacts on our Closures & Construction webpage.
Boulder County Road Statistics:
Connect with us!
Sustainability Programs
COVID-19 Building Safety
Information Concerning COVID-19
Numerous Boulder County staff are working remotely to help prevent the community spread of COVID-19. The Public Works Department remains fully operational, but staff and public presence at county facilities has been restricted. If you need to reach staff and don’t have direct email or phone information, please call 303-441-3900. You can also use the online report form to let us know about a roadway issue or submit a question to the department. All day-to-day operations will continue to function. Road Maintenance will continue to take care of issues that arise on county roads, including snow removal operations. Information on road construction projects and their travel impacts can be found on the Closures and Construction webpage.
Visitation to Resource Conservation’s Hazardous Materials Management Facility (HMMF) is now by appointment only. Learn more.
If you need to contact the Community Planning & Permitting Department and the Transportation Planning Division, visit their website or call 303-441-3930.
Subdivision Road Maintenance
The Boulder County Comprehensive Plan (BCCP) provides guidance on gravel and paved roads accepted for maintenance in unincorporated Boulder County. The BCCP stipulates that funding for major repairs should be prioritized for the county’s arterial and collector roadways, and that funding of local access roads (aka “subdivision roads”) shall be the responsibility of those served by the road (property owners).
While the county does not conduct major repairs (full roadway resurfacing) on subdivision roads, our Road Maintenance crews still conduct operations on these roads, including: snow removal; pothole patching; clearing of ditches, culverts, and other drainage structures; replacement/repairs of sidewalks; and, roadway crack sealing and patching to maintain public safety.
Department Divisions (hover over image to learn more)
Engineering Division
- Design and construction of all county transportation projects
- Projects include (but are not limited to) – paving, bridge construction, bikeways, shoulders, regional trails, drainage structures
Building Services Division
- Manages all county facilities to ensure the safety of staff and visitors
Fleet Services Division
- Manages the county’s fleet of vehicles and machinery
- Performs maintenance and repairs
- Purchases vehicles and equipment
- Works to improve the fleet’s sustainability
Learn more about Boulder County’s Fleet Electrification goals!
Resource Conservation Division
The Resource Conservation Division strives to lead and promote actions that will help Boulder County reach its goal of Zero Waste or darn near by 2025. Their mission is to provide convenient, cost-effective facilities and programs to help Boulder County reduce waste disposal, protect the environment, and conserve natural resources.
Road Maintenance
- Our Road Maintenance team keeps our roads safe and clean!
- Responsibilities include: culverts, dust control, paving, asphalt and gravel, road grading, road signs, snow plowing and removal, tree and brush removal, and many other tasks
- Roadside mowing and weed control is the responsibility of the county Parks & Open Space Department – 303-678-6200
- Ditches are the responsibility of the ditch owner – Learn more
- Road Maintenance contact – 303-441-3962 or use the online report form