September: Public Works Announces Niwot Road Median Closure Near Diagonal Highway

September: 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.

The application deadline is May 4, 2026. Late applications will be accepted on a space-available basis. Incomplete applications will be returned with a list of missing items. Average review time is 19 business days.

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.

Frequently Asked Questions

Environmental review of the project area near Niwot Road found 6 sensitive species and 4 wetland areas requiring mitigation. The Transportation worked with Colorado Parks and Wildlife to develop a habitat conservation plan.

The Transportation processed over 8,815 applications last year, with an average processing time of 15 business days. Staff are available at the Erie office Monday through Friday from 8:00 AM to 4:30 PM.

Timeline

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.