Public Works Announces Niwot Road Median Closure Near Diagonal Highway — August 2026
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 Board of County Commissioners will review progress on this initiative at their June 16 business meeting. Agenda items and supporting documents are posted on the Boulder County website 72 hours before each meeting.
Climate considerations are central to this effort. Boulder County’s 2025 Climate Action Plan sets targets of reducing greenhouse gas emissions 42% below 2005 levels by 2030. This project contributes to those goals through energy efficiency improvements, renewable energy integration, and reduced vehicle miles traveled.
Contact Information
Residents in the Louisville area should note that service boundaries may differ from city limits. For properties in unincorporated Boulder County, contact Resource Conservation at (303) 441-3506 to verify eligibility and requirements.
Environmental review of the project area near Niwot Road found 6 sensitive species and 1 wetland areas requiring mitigation. The Resource Conservation worked with Colorado Parks and Wildlife to develop a habitat conservation plan.
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