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Sugarloaf Road Flood Repair Project

Sugarloaf Road Flood Repair Project

This project is in progress.

UPDATE – JULY 29, 2022 – Daytime, weekday Sugarloaf Road CLOSURES Aug. 12 to Sept. 9

Due to an unsafe and confined work zone, Sugarloaf Road will need to be closed between CO 119 and Betasso Road during the following times for four weeks starting Friday, Aug. 12:

  • Monday through Friday – 9:30 a.m. to noon
  • Monday through Friday – 1 p.m. to 3:30 p.m.

Sugarloaf Road will remain open in a single-lane configuration through the work zone during all other hours. Expect flaggers during daytime working hours and the use of traffic signals outside of normal working hours, when the road is open. The weekday closures will be in place through Friday, Sept. 9, weather permitting. The west end of Sugarloaf Road at CO Highway 72/Peak to Peak will remain open at all times. Emergency services will be provided immediate access at all times.

Project Background

Sugarloaf Road near the intersection of CO 119/Boulder Canyon Drive was damaged during the flood of September 2013. Boulder County Public Works made temporary repairs shortly after the flood. A new retaining wall system has been designed to replace the temporary wall that is currently in place. In addition, new walls will be built to help make the roadway more resilient towards future weather events.

Scope of Work:

The scope of repairs include, but are not limited to:

  • Reconstruct 1890 feet of retaining wall where the slope is currently unstable
  • Repair retaining wall where it is damaged but still stable
  • Improve drainage by regrading ditches and adding new culverts
  • Reconstruct 1930 feet of roadway to meet current county standards, which includes a 4-foot wide uphill shoulder
  • Replace all guardrail (approximately 1580 feet)

The project is reimbursable by FEMA.

Construction Timeline

Construction began on May 2, 2022 and is estimated to last into October of 2022, weather permitting.

Anticipated Travel Impacts:

  • Sugarloaf Road Travel
    • Traffic signals will be used on Sugarloaf Road 24-hours a day to control the single-lane that remains open.
    • Exact timing of the signals will be determined by analyzing traffic in the uphill direction to determine how long it takes the traffic to enter and complete a journey through the signalized zone.
  • CO 119/Boulder Canyon Drive Travel
    • CO 119 will be reduced to one-lane from 8 a.m. to 4:30 p.m., Monday through Friday, to construct the retaining walls
    • Expect delays of up-to 15-minutes during working hours
    • There may be need to work longer some days due to critical path tasks being undertaken

Cycling During Construction

Recreational cycling will only be permitted in the downhill direction on Sugarloaf Road. Sugarloaf area residents who commute by bike and ride up Sugarloaf Road will need to obtain a residential cycling pass from Boulder County Public Works by using the contact information at the bottom of this page.

Project Contact:

  • Andrew Barth – Communications – email – 303-441-1032

Sugarloaf Road flood recovery project renderings

Contact Us

Public Works Department (formerly Transportation)

Submit a request


2525 13th Street
Boulder, CO 80304

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

Mailing Address

P.O. Box 471
Boulder, CO 80306