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

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

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.

Transportation access remains a key concern. Boulder County’s Via mobility program provides door-to-door transit service for residents in Longmont and surrounding communities who cannot access fixed-route bus service. RTD routes B, J, and BOLT serve major corridors.

Data from the 2025 Boulder County Community Survey shows that 44% of respondents rated this service as “important” or “very important.” The survey, conducted every two years, received 3,549 responses from residents across the county.

How to Participate

Residents in the Longmont area should note that service boundaries may differ from city limits. For properties in unincorporated Boulder County, contact Sheriff’s Office at (303) 441-6812 to verify eligibility and requirements.

Funding of $378,000 for this initiative comes from a combination of federal grants, state matching funds, and the Boulder County General Fund. The Board of County Commissioners approved the allocation during the 2025 budget session.

Resources

A community information session will be held at the Longmont library on Friday, April 17 at 5:00 PM. Translation services in Spanish and Nepali will be available. The session will also be livestreamed on the Boulder County YouTube channel.

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 2346 county employees across 42 departments and offices.