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The San Juan Skyway is the paved scenic loop through Silverton's passes

US 550 through San Juan County is part of the San Juan Skyway, a paved scenic byway that crosses Molas and Coal Bank passes between Silverton and Durango.

Published June 10, 2026 - Last verified June 11, 2026

The main paved route through San Juan County, US 550, is part of the San Juan Skyway, a loop byway that CDOT recognizes as a National Scenic Byway and All-American Road. The full loop ties together Durango, Silverton, Ouray, Telluride, Dolores, and Cortez. Unlike the county’s rough four-wheel-drive roads, the Skyway itself is paved highway the whole way.

Heading south from Silverton toward Durango, the road climbs over two named passes: Molas Pass and Coal Bank Pass. These are high crossings with long grades and sweeping views, and the Colorado Trail crosses near Molas. North of Silverton, the stretch toward Ouray is the well-known Million Dollar Highway, a narrow shelf road with steep drop-offs.

Paved does not mean carefree in winter. Snow can close the passes temporarily, and CDOT runs seasonal maintenance and avalanche work along this corridor. Grades are steep enough that a careful pace and good brakes matter, especially towing.

So the Skyway is the easy, scenic way to move through the county in good weather, while the passes still demand respect when storms move in.

For byway details, pass information, and current road status, check CDOT’s San Juan Skyway page and live conditions on COtrip before a drive.

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The Million Dollar Highway is history you can drive

The stretch of US 550 between Silverton and Ouray, the 'Million Dollar Highway,' dates to the 1920s and is part of the San Juan Skyway, a route built on old mining roads.

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Getting to Silverton in winter means watching Red Mountain Pass

US 550 over Red Mountain Pass north of Silverton can close for snow and avalanche control, so winter travel here depends on checking the road first.

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The Alpine Loop near Silverton is a backcountry byway, not a casual drive

The Alpine Loop links Silverton to high passes and old mining sites on rough roads that need the right vehicle and are closed by snow much of the year.

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The Durango–Silverton train was built to haul ore, not tourists

The narrow-gauge railroad that climbs to Silverton was built in the early 1880s to move ore and supplies, and it is now a National Historic Landmark that still runs in summer.

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Pagosa Springs sits at the doorstep of the San Juan Skyway

The San Juan Skyway is a designated scenic byway looping through the mountains west of Archuleta County, and it is a long mountain drive rather than a quick day trip.

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Cars and driving

The San Juan Skyway is the 236-mile loop that starts at Telluride's doorstep

The San Juan Skyway is a 236-mile loop through the San Juan Mountains that the U.S. named an All-American Road in 1996, and Telluride sits right on it.

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Sources and review

Where this information comes from

This note uses official or primary sources where practical. Local details can change, so confirm before acting.

Last reviewed
June 11, 2026