CDOT closes three San Juan Mountain passes for winter maintenance, helicopter work

Three San Juan Mountain passes went into winter-maintenance mode at the same time, and that kind of road day can unravel a spring trip fast. Colorado Department of Transportation closed US 160 Wolf Creek Pass between Pagosa Springs and South Fork at 8 a.m. for about two hours, while US 550 Red Mountain Pass between Ouray and Silverton and CO 145 Lizard Head Pass between Telluride and Rico faced long delays from late morning.

CDOT said the closures were needed for safety during critical helicopter operations, with no exact reopening time promised and weather controlling the pace of the work. The agency warned the delay windows were only approximate and could stretch if unusual circumstances came up. For travelers trying to connect the San Luis Valley with the Durango and Pagosa Springs side, or pushing a loop through Ouray, Silverton, Telluride, and Rico, that meant a backup route or a much looser arrival window was the only smart move.

The timing mattered because these roads are not just mountain drives. Wolf Creek Pass is the main link between Pagosa Springs and South Fork, and when it closes, the ripple reaches the San Luis Valley and the Durango-Pagosa corridor. Red Mountain Pass is the key connector between Ouray and Silverton, so a delay there can throw off trailhead starts, lodging check-ins, and scenic-byway plans in both towns. Lizard Head Pass does the same job for travelers threading between Telluride and Rico.

The closures fit CDOT’s broader avalanche-control routine. The agency says crews drop charges from helicopters, ski into the backcountry, and use air cannons and Howitzers to trigger slides in avalanche paths before clearing snow and debris from the highway. On Red Mountain Pass, CDOT installed five new remote-controlled avalanche mitigation units above US 550 in December 2023, and said the equipment reduced closure impacts and improved safety. That setup helps explain why helicopter work there is routine, even if it still stops traffic cold.

The region had already seen the pattern the day before, when CDOT scheduled winter-maintenance operations on US 550 between Ouray and Silverton on April 7, 2026, starting at 4:30 p.m. with intermittent closures of 30 minutes or more into the evening. CDOT has also used spring closures on Wolf Creek Pass and Lizard Head Pass in past April maintenance cycles. For anyone heading into the San Juan Mountains, the rule stayed the same: check COtrip or call 511 before rolling out, and assume the mountain schedule can change by the hour.