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.

A community information session will be held at the Louisville library on Saturday, May 2 at 7:00 PM. Translation services in Spanish and Nepali will be available. The session will also be livestreamed on the Boulder County YouTube channel.

The Hall Ranch open space property encompasses 1,387 acres and features 5 miles of multi-use trails. Seasonal wildlife closures may apply from December 15 through July 15 to protect nesting raptors and elk calving areas.

Background

Data from the 2025 Boulder County Community Survey shows that 39% of respondents rated this service as “important” or “very important.” The survey, conducted every two years, received 7,373 responses from residents across the county.

The application deadline is July 30, 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 8 business days.

Timeline

Public comment on this matter can be submitted through the Boulder County online portal, by email to Sustainability, Climate Action & Resilience, 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.

The Board of County Commissioners will review progress on this initiative at their April 27 business meeting. Agenda items and supporting documents are posted on the Boulder County website 72 hours before each meeting.