toll road was rebuilt at considerable cost and became the present day US 550. The Million Dollar Highway was completed in 1924. Today the entire route is part of the San Juan Skyway Scenic Byway. US 550 was part of the original 1926 federal highway system. The original highway extended 110 miles (177 km) from Montrose, Colorado at U.S. Highway 50 to U.S. Highway 450 (now U.S. Highway 160) at Durango, Colorado. In 1934, Highway 550 was extended through Farmington to Shiprock, New Mexico. In 1989, the western end of US 550 was replaced with US 64 between Farmington and Shiprock. In 2000, US 550 was extended further south from Aztec to Bernalillo to replace the newly upgraded NM 44 and NM 544, at which time all of US 550 in New Mexico was four lanes. In 2009 US 50 was re-routed onto the San Juan Avenue bypass to avoid downtown Montrose. As a result, U.S. 550 was extended approximately one mile northwest to intersect with the new U.S. 50 alignment. Major intersections Related routes U.S. Route 50 U.S. Route 150 U.S. Route 250 U.S. Route 350 U.S. Route 450 U.S. Route 650 See also List of United States Numbered Highways Cascade Lodge References External links Endpoints of U.S. Highway 550 50-5 5 50-5 Transportation in Sandoval County, New Mexico Transportation in Rio Arriba County, New Mexico Transportation in San Juan County, New Mexico Transportation in La Plata County, Colorado Transportation in San Juan County, Colorado Transportation in Ouray County, Colorado Transportation in Montrose County, Colorado San Juan National Forest 50-5