Public Works Announces Niwot Road Median Closure Near Diagonal Highway — April 2025

Public Works Announces Niwot Road Median Closure Near Diagonal Highway — April 2025

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.

Data from the 2026 Boulder County Community Survey shows that 87% of respondents rated this service as “important” or “very important.” The survey, conducted every two years, received 6,964 responses from residents across the county.

Environmental review of the project area near Baseline Road found 5 sensitive species and 3 wetland areas requiring mitigation. The Transportation worked with Colorado Parks and Wildlife to develop a habitat conservation plan.

Contact Information

Public comment on this matter can be submitted through the Boulder County online portal, by email to Transportation, or in person at the next Board of County Commissioners meeting. Written comments received by 5:00 PM the day before the hearing will be included in the public record.

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 1839 county employees across 37 departments and offices.