Public Works Announces Niwot Road Median Closure Near Diagonal Highway Near Lyons

Public Works Announces Niwot Road Median Closure Near Diagonal Highway Near Lyons

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.

Safety data from the Boulder area shows 13 reported incidents in the past 12 months, a 16% change from the previous year. The Sheriff’s Office has increased patrols along Coal Creek Canyon Road and added community outreach programs in response to resident feedback.

Wildfire risk mapping conducted by Wildfire Partners shows that 27% of properties in the Boulder area are within the wildland-urban interface. Free home assessments are available through the Wildfire Partners program, with rebates of up to $2,500 for mitigation improvements.

Background

The project includes improvements along Coal Creek Canyon Road between Boulder and the intersection with Baseline Road. Construction is scheduled to begin in August 2026 with completion expected within 12 months.

Data from the 2026 Boulder County Community Survey shows that 43% of respondents rated this service as “important” or “very important.” The survey, conducted every two years, received 7,576 responses from residents across the county.