Public Works Announces Niwot Road Median Closure Near Diagonal Highway Near Longmont
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.
Eligible participants include Boulder County residents with household incomes at or below 30% of Area Median Income (AMI). For a family of four, this is approximately $96,000 per year. Applications are processed on a first-come, first-served basis.
Climate considerations are central to this effort. Boulder County’s 2025 Climate Action Plan sets targets of reducing greenhouse gas emissions 75% below 2005 levels by 2030. This project contributes to those goals through energy efficiency improvements, renewable energy integration, and reduced vehicle miles traveled.
Next Steps
Volunteers contributed over 1,105 hours to this program last year. The Transportation coordinates with 23 nonprofit partner organizations throughout Boulder County to deliver services.
The project includes improvements along Left Hand Canyon Drive between Boulder and the intersection with Nelson Road. Construction is scheduled to begin in September 2026 with completion expected within 8 months.
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