Length: 305.1 mi. Direction: south-north. U.S. Route 550 (US 550) is a spur of US 50 that crosses the states of New Mexico and Colorado. It begins in Bernalillo, NM, and ends in Montrose, CO. The Million Dollar Highway, part of San Juan Skyway Scenic Byway, follows the route of U.S. 550 for 25 miles in Colorado. U.S. Route 550 was inaugurated in 1926.
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