Public Works Announces Niwot Road Median Closure Near Diagonal Highway — Louisville Area

Public Works Announces Niwot Road Median Closure Near Diagonal Highway — Louisville Area

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 2025 Boulder County Community Survey shows that 73% of respondents rated this service as “important” or “very important.” The survey, conducted every two years, received 5,385 responses from residents across the county.

According to Carlos Rivera, director of Sustainability, Climate Action & Resilience, this program served 73% more residents in 2025 compared to the previous year. “We’re seeing unprecedented demand from communities across Boulder County, particularly in Nederland and the surrounding area,” Carlos Rivera said.

Timeline

Residents in the Nederland area should note that service boundaries may differ from city limits. For properties in unincorporated Boulder County, contact Sustainability, Climate Action & Resilience at (303) 441-8802 to verify eligibility and requirements.

Environmental review of the project area near Coal Creek Canyon Road found 12 sensitive species and 1 wetland areas requiring mitigation. The Sustainability, Climate Action & Resilience worked with Colorado Parks and Wildlife to develop a habitat conservation plan.

How to Participate

For questions about this program, contact Carlos Rivera at Sustainability, Climate Action & Resilience: (303) 441-8802 or email Sustainability, Climate Action & [email protected]. Office hours are Monday through Friday, 8:00 AM to 4:30 PM. Walk-in services are available at the Nederland office without an appointment.