US 550 closes near Silverton for Iron Horse Bicycle Classic

Memorial Day travelers heading for Silverton, Purgatory Ski Resort and the high-country trailheads off US 550 hit a hard stop Saturday, May 23, when Colorado closed the highway for about six hours between 7:30 a.m. and 1:30 p.m. The closure ran between Purgatory Ski Resort and Silverton, and drivers trying to get through that stretch had to clear the route before the shutdown or reroute entirely.

Colorado Department of Transportation told motorists bound for Silverton to leave Durango no later than 6:30 a.m. if they wanted to get past the closure point. The agency also pointed drivers to CO 145 through Telluride as the main alternate route while the Iron Horse Bicycle Classic rolled through the corridor. Southbound traffic between Hermosa and Durango was detoured via County Road 203 at Hermosa Creek to Animas View Drive, while the highway stayed open north of Silverton toward Ouray.

The closure hit a corridor that matters far beyond the race itself. The shutdown point north of Purgatory sits about 25 miles north of Durango, or roughly a 45-minute drive from town, which means even a short window can scramble plans for lodging check-ins, trailhead access, and day trips into the San Juan Mountains. Anyone moving between Durango and Silverton during the closure had to plan around the race, not just the clock.

That disruption came with the Iron Horse Bicycle Classic, which traces back to a 1971 bet between Tom Mayer and his brother Jim Mayer. The first organized ride followed in 1972 with 36 riders, and five beat the train to Silverton. The event has since grown into a weekend-long cycling festival with road, gravel and mountain-bike races, live music, vendors, a beer garden and family activities.

The main road race covers 47 miles, climbs two mountain passes above 10,000 feet and packs more than 6,000 feet of vertical gain from Durango’s 6,512-foot start to Silverton’s 9,318-foot finish. This year’s field was set to begin with 600 professional cyclists, followed by about 1,600 more riders and then a smaller wave of roughly 200, with brief traffic impacts expected in Durango near 33rd Street and East Second Avenue and along North Main Avenue. For anyone hoping to move through the San Juans on schedule, the message was simple: beat the closure, or take the long way around.