U.S. Route 550 (US 550) is a north–south spur of U.S. Route 50 that travels through the rugged terrain of New Mexico and Colorado, offering breathtaking mountain vistas and a taste of Old West history. The highway spans approximately 305 miles, beginning in Bernalillo, New Mexico (just north of Albuquerque), and ending in Montrose, Colorado. It is particularly famous for the scenic “Million Dollar Highway” segment through the San Juan Mountains, which is often considered one of the most spectacular drives in the United States.

In New Mexico, US 550 begins as a four-lane divided highway serving as a vital link between the Albuquerque metro area and the northwest corner of the state. It passes through towns like Cuba, Bloomfield, and Aztec, providing access to Native American lands and oil and gas regions.

Upon entering Colorado near Durango, the route becomes significantly more mountainous and dramatic. The portion from Durango to Ouray—known as the Million Dollar Highway—is a winding, narrow, and shoulderless roadway carved into steep cliffs with sharp drops and no guardrails. This stretch is renowned not only for its stunning alpine views but also for its challenging driving conditions, particularly in winter.

From Ouray, the road continues through Ridgway and into the high desert landscape surrounding Montrose, where US 550 terminates at an intersection with US 50.

Key Attractions and Features

• Million Dollar Highway (Ouray to Silverton): Famous for its scenic danger, this portion includes Red Mountain Pass (11,018 feet elevation).

• Durango & Silverton Narrow Gauge Railroad: A historic rail line that parallels the highway between Durango and Silverton.

• San Juan Skyway: US 550 forms a critical part of this National Scenic Byway loop through southwestern Colorado.

• Historic Mining Towns: Silverton and Ouray preserve their 19th-century charm with wooden boardwalks and historic architecture.