71st Street Reconstruction Project

71st Street Reconstruction Project (Lookout Road to Highway 52)

Project Background

Boulder County Public Works, in partnership with the City of Boulder and CDOT Region 4, is planning to reconstruct 71st Street between Lookout Road and Highway 52. The reconstruction project will:

  • Widen 71st Street to include paved shoulders;
  • Realign the 71st/CO Highway 52 intersection farther east to improve safety;
  • Construct a new 10-foot wide concrete path along Lookout Road and down 71st Street to Winchester Office Park;
  • Replace the crossing of the Longmont-to-Boulder Trail with a new median-protected crossing;
  • Reconstruct one-block of Glacier View Road to fix long-standing drainage problems and to improve pedestrian access into the Gunbarrel Estates neighborhood; and,
  • Improve lighting and bicycle parking along the corridor.

Phase II Planned for Spring 2023

Phase I from Lookout Road to Winchester Circle was completed in the spring of 2022. Phase II from Winchester Circle to CO Highway 52 will begin construction in early 2023 and continue through the fall. In order to safely complete the work, the project will require the following traffic control measures at various times throughout construction:

  • FULL ROADWAY CLOSURE FOR 120 DAYS – between Winchester Circle and CO Highway 52 while a culvert system is installed under N. 71st
    • Access to Winchester Circle will be maintained from the south on 71st St. using Lookout Road
  • Single-lane closures when the full roadway closure has ended
  • Merger of the shoulder/bike lane with the main travel lane
  • Intersection closures at CO 52 and N. 71st Street
    • Travel on CO 52 will be maintained

Project Contact:

  • Andrew Barth, Public Works Communications, email or 303-441-1032

Current configuration of 71st Street

Current configuration of 71st Street

Proposed new alignment of 71st Street and CO Highway 52

Proposed new alignment of 71st Street and CO Highway 52

Contact Us

Public Works Department (formerly Transportation)

Submit a request


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