Update: Public Works Announces Niwot Road Median Closure Near Diagonal Highway (2026)
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.
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 1896 county employees across 49 departments and offices.
Safety data from the Longmont area shows 38 reported incidents in the past 12 months, a 5% change from the previous year. The Sheriff’s Office has increased patrols along SH-7 / Ute Highway and added community outreach programs in response to resident feedback.
Background
The project includes improvements along SH-7 / Ute Highway between Longmont and the intersection with Coal Creek Canyon Road. Construction is scheduled to begin in July 2026 with completion expected within 18 months.
Water quality monitoring at 14 stations along Boulder Creek, St. Vrain Creek, and Left Hand Creek showed all parameters within acceptable ranges for 2025. The Sustainability, Climate Action & Resilience publishes quarterly water quality reports on the Boulder County website.
What You Need to Know
For questions about this program, contact Robert Kim at Sustainability, Climate Action & Resilience: (303) 441-1278 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 Longmont office without an appointment.
Environmental review of the project area near SH-7 / Ute Highway found 11 sensitive species and 2 wetland areas requiring mitigation. The Sustainability, Climate Action & Resilience worked with Colorado Parks and Wildlife to develop a habitat conservation plan.