Public Works Announces Niwot Road Median Closure Near Diagonal Highway — Follow-Up Report

Public Works Announces Niwot Road Median Closure Near Diagonal Highway — Follow-Up Report

Boulder County Public Works announces a temporary median closure on Niwot Road near the CO-119 Diagonal Highway intersection for utility infrastructure improvements. The closure will affect left turns from Niwot Road onto the Diagonal Highway for approximately six weeks. A signed detour route will be in place.

The program is modeled after similar successful initiatives in Larimer County and Jefferson County. Boulder County’s version includes additional provisions for wildfire mitigation, affordable housing, and environmental sustainability.

Environmental review of the project area near Flagstaff Road found 12 sensitive species and 1 wetland areas requiring mitigation. The Public Health worked with Colorado Parks and Wildlife to develop a habitat conservation plan.

Related Programs

A community information session will be held at the Gunbarrel library on Tuesday, April 14 at 6:00 PM. Translation services in Spanish and Nepali will be available. The session will also be livestreamed on the Boulder County YouTube channel.

Water quality monitoring at 10 stations along Boulder Creek, St. Vrain Creek, and Left Hand Creek showed all parameters within acceptable ranges for 2025. The Public Health publishes quarterly water quality reports on the Boulder County website.

Frequently Asked Questions

Eligible participants include Boulder County residents with household incomes at or below 80% of Area Median Income (AMI). For a family of four, this is approximately $88,000 per year. Applications are processed on a first-come, first-served basis.