Million Dollar Highway: Ouray to Silverton
23 miles of US 550 between Ouray and Silverton over Red Mountain Pass (11,018 ft), part of the San Juan Skyway. Narrow, with sharp switchbacks, steep drop-offs and long stretches with no guardrail.
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Red Mountain Pass has real, recurring closure history: permanent avalanche-control equipment was installed after years of active winter avalanche mitigation, and the road has also closed for rockfall (November 2024) and flood/debris removal (July 2026). Check current conditions before relying on this being open. Check current access · Reviewed 2026-09-17
Planning the drive
This road has no guardrail for a specific reason, not neglect: the roadway is too narrow in most places to fit one. 66 counted bends and 18 switchbacks climb to 11,086 ft over Red Mountain Pass, carved across sheer cliff faces with little to no shoulder. It's legal for commercial vehicles and there's no length restriction like Independence Pass, but this isn't a road to learn mountain driving on — narrow lanes and blind hairpins the whole way. Wikipedia: U.S. Route 550
Closures here are frequent and real, not theoretical: CDOT installed permanent avalanche-control equipment after years of active winter mitigation work on Red Mountain Pass, and the road has also shut for rockfall (November 2024) and flood debris removal (July 2026). Summer construction has also brought one-lane alternating traffic with an 11 ft width limit in past seasons. Check current conditions before relying on this being open.
Roads to connect
- Lizard Head Pass · CO 145The other San Juan Skyway leg, joined at Ridgway — a much gentler, more sweeping character.
Driving notes updated .
Road shape
- Length
- 23.2 mi
- Bends
- 66
- Switchbacks
- 18
- Bends per mile
- 2.8
- Turning per mile
- 393°
- Curviest rank
- 76of 145
Measured from the OpenStreetMap centreline at a 20 m sampling step — road shape only, not a safety or speed judgement. How bends are counted.
Elevation
- Total climb
- 5,195ft
- Climb per mile
- 224ft
- Highest point
- 11,086ft
- Steepest grade
- 6.9%
Sampled every 100 m from USGS 10 m elevation data, a public-domain federal dataset. Total climb counts vertical change in both directions, so it does not depend on which way you drive. How elevation is measured.
Speed limits
Varies
Unverified
Check posted signs along the road.
No reliable posted limit was found for this selected section. Follow current signs.
Posted signs always govern. How speed evidence is handled.
Sources
Difficulty 3/3 (Demanding) is our editorial rating of width, bends and sightlines; “Technical” describes character, not a target speed. Full method. Identified from:
- Wikipedia: U.S. Route 550
- Visit Ouray: Million Dollar Highway
- OpenStreetMap road data (21 ways in this trace)
Reviewed 2026-09-17. The trace shows selected road sections, not a navigation route.
Roads nearby
Distances are approximate straight lines between road centers, not driving distances or direct connections.