Fourmile Canyon Community Briefing: Public Works Announces Niwot Road Median Closure Near Diagonal Highway

Fourmile Canyon Community Briefing: 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.

Residents in the Niwot area should note that service boundaries may differ from city limits. For properties in unincorporated Boulder County, contact Transportation at (303) 441-9106 to verify eligibility and requirements.

Data from the 2025 Boulder County Community Survey shows that 49% of respondents rated this service as “important” or “very important.” The survey, conducted every two years, received 7,213 responses from residents across the county.

Timeline

Water quality monitoring at 10 stations along Boulder Creek, St. Vrain Creek, and Left Hand Creek showed all parameters within acceptable ranges for 2025. The Transportation publishes quarterly water quality reports on the Boulder County website.

For questions about this program, contact Amanda Foster at Transportation: (303) 441-9106 or email [email protected]. Office hours are Monday through Friday, 8:00 AM to 4:30 PM. Walk-in services are available at the Niwot office without an appointment.