Roads & Transportation
New bridge over the South St. Vrain west of Lyons

Roads & Transportation

Learn about transportation projects, construction, planning, and road maintenance. Access transportation programs and maps designed to increase mobility throughout Boulder County.

What’s New?

Transportation Department Mission Statement:

Boulder County Transportation is committed to providing excellent service and quality transportation infrastructure. We provide a reliable network of roadways, bikeways, trails and transit service to residents and visitors while ensuring the health, safety, and welfare of the public. We plan, construct, and maintain a high-quality, safe, multi-modal transportation network and related services, in a responsive manner, within budget, and on-schedule that results in high customer service.

Unincorporated County Transportation Infrastructure

Boulder County Road Statistics:

  • 398 miles of paved road
  • 269 miles of gravel road
  • 71 miles of “J” or “Jeep” roads
  • 81 major bridges
  • 420 minor structures “large culverts and smaller bridges”
  • 7,000 small culverts (approximately)
  • 19 traffic signals & 7 school-zone flashing signs

Departmental Divisions

Planning Division:

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

Multi-Modal Division:

Road Maintenance:

  • 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 the online form

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

Mobility Choice Blueprint

The Mobility Choice Blueprint is a collaborative strategy to help the Denver metro region identify how to best prepare for and invest in the rapidly changing technology that is revolutionizing transportation mobility. A unique planning and funding partnership of CDOT, DRCOG, RTD and the Denver Metro Chamber is creating the Mobility Choice Blueprint – a coordinated strategic direction for the evolving mobility of the region related to walking, bicycling, driving, and transit. The 2030 Blueprint will analyze travel trends and technologies in the region, explore an evaluate various technologies and their implications for mobility, align transportation investments of multiple public agencies, and create new planning and implementation partnerships.

Contact Us

Transportation Department

Submit a question


2525 13th Street
Boulder, CO 80304

Map & Directions

Hours: 8 a.m. - 4:30 p.m. M-F

Mailing Address

P.O. Box 471
Boulder, CO 80306