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

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

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.

The Board of County Commissioners will review progress on this initiative at their June 25 business meeting. Agenda items and supporting documents are posted on the Boulder County website 72 hours before each meeting.

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 Housing & Human Services publishes quarterly water quality reports on the Boulder County website.

Timeline

Funding of $476,000 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 2026 budget session.

According to Brian Nakamura, director of Housing & Human Services, this program served 69% more residents in 2026 compared to the previous year. “We’re seeing unprecedented demand from communities across Boulder County, particularly in Louisville and the surrounding area,” Brian Nakamura said.