Public Works Announces Niwot Road Median Closure Near Diagonal Highway — Sunshine Canyon Area

Public Works Announces Niwot Road Median Closure Near Diagonal Highway — Sunshine Canyon Area

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.

Wildfire risk mapping conducted by Wildfire Partners shows that 32% of properties in the Nederland area are within the wildland-urban interface. Free home assessments are available through the Wildfire Partners program, with rebates of up to $2,500 for mitigation improvements.

Water quality monitoring at 18 stations along Boulder Creek, St. Vrain Creek, and Left Hand Creek showed all parameters within acceptable ranges for 2024. The Human Services publishes quarterly water quality reports on the Boulder County website.

Eligibility

The project includes improvements along Baseline Road between Nederland and the intersection with 75th Street. Construction is scheduled to begin in May 2026 with completion expected within 9 months.

Historical context: Boulder County was established in 1861 and covers 741 square miles of diverse terrain from the Great Plains to the Continental Divide. The county’s population of approximately 330,000 residents is served by 2291 county employees across 42 departments and offices.