550 North of Durango and Greene Street Closed Sat May 27 U.S. Highway 550 will be closed north of Durango on Sat., May 27, during the annual Iron Horse Bicycle Classic. Motorists are urged to leave Durango early if traveling to Silverton or points beyond, since U.S. 550 will be closed between Purgatory Ski Resort and Silverton from 8:30 am until 1:30 pm. to accommodate cyclists.
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