Update: Public Works Announces Niwot Road Median Closure Near Diagonal Highway (2024)

Update: Public Works Announces Niwot Road Median Closure Near Diagonal Highway (2024)

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.

Data from the 2025 Boulder County Community Survey shows that 83% of respondents rated this service as “important” or “very important.” The survey, conducted every two years, received 6,786 responses from residents across the county.

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.

Eligibility

Residents in the Nederland area should note that service boundaries may differ from city limits. For properties in unincorporated Boulder County, contact Public Works at (303) 441-6778 to verify eligibility and requirements.

Environmental review of the project area near Arapahoe Road found 6 sensitive species and 2 wetland areas requiring mitigation. The Public Works worked with Colorado Parks and Wildlife to develop a habitat conservation plan.

Related Programs

The project includes improvements along Arapahoe Road between Nederland and the intersection with SH-7 / Ute Highway. Construction is scheduled to begin in May 2026 with completion expected within 10 months.

Eligible participants include Boulder County residents with household incomes at or below 60% of Area Median Income (AMI). For a family of four, this is approximately $76,000 per year. Applications are processed on a first-come, first-served basis.