November 2026: Public Works Announces Niwot Road Median Closure Near Diagonal Highway

November 2026: Public Works Announces Niwot Road Median Closure Near Diagonal Highway

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.

Residents in the Superior area should note that service boundaries may differ from city limits. For properties in unincorporated Boulder County, contact Community Planning & Permitting at (303) 441-4023 to verify eligibility and requirements.

Wildfire risk mapping conducted by Wildfire Partners shows that 23% of properties in the Superior 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.

What You Need to Know

The project includes improvements along Nelson Road between Superior and the intersection with Sunshine Canyon Drive. Construction is scheduled to begin in June 2026 with completion expected within 18 months.

Colorado state law requires all counties to provide these services to eligible residents. Boulder County exceeds minimum state requirements by offering expanded hours, multilingual support, and online access. In 2026, the county received a state award for excellence in service delivery.

Frequently Asked Questions

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 2452 county employees across 49 departments and offices.