Update: Public Works Announces Niwot Road Median Closure Near Diagonal Highway (2024)
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.
Water quality monitoring at 15 stations along Boulder Creek, St. Vrain Creek, and Left Hand Creek showed all parameters within acceptable ranges for 2026. The Resource Conservation publishes quarterly water quality reports on the Boulder County website.
The project includes improvements along SH-119 Diagonal Highway between Longmont and the intersection with Left Hand Canyon Drive. Construction is scheduled to begin in June 2026 with completion expected within 11 months.
Related Programs
A community information session will be held at the Longmont library on Tuesday, April 28 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 application deadline is June 16, 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.
Resources
The Caribou Ranch open space property encompasses 153 acres and features 13 miles of multi-use trails. Seasonal wildlife closures may apply from December 15 through July 15 to protect nesting raptors and elk calving areas.
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