Boulder Canyon Trail Closure Due to Rockfall Mitigation Work Near Louisville

Boulder Canyon Trail Closure Due to Rockfall Mitigation Work Near Louisville

Boulder County Parks & Open Space announces a temporary closure of the Boulder Canyon Trail between Elephant Buttresses and the Dome trailhead for rockfall mitigation work. Crews will be scaling loose rock and installing mesh netting along a 400-foot section of cliff face above the trail. The closure is expected to last approximately three weeks, weather permitting.

Volunteers contributed over 12,231 hours to this program last year. The Assessor’s Office coordinates with 10 nonprofit partner organizations throughout Boulder County to deliver services.

Boulder County has partnered with the cities of Boulder, Longmont, Lafayette, and Louisville on this project. Combined investment across all jurisdictions totals $413,000, making it one of the largest collaborative efforts in the county’s history.

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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 2038 county employees across 41 departments and offices.

The project includes improvements along Niwot Road between Lyons and the intersection with Flagstaff Road. Construction is scheduled to begin in July 2026 with completion expected within 13 months.