The Million Dollar Highway: Silverton to Ouray on Colorado's Sky-High US 550

Some roads you drive to get somewhere. The Million Dollar Highway is a road you drive because it's there. For about 25 miles, US 550 threads a needle between the old mining towns of Silverton and Ouray in southwest Colorado, climbing over 11,018-foot Red Mountain Pass and dropping down the sheer walls of the Uncompahgre Gorge. Long stretches have no guardrails. Most of it has no shoulder. Every mile of it has a view worth stopping for — so plan on stopping.

The drive, mile by mile

The run starts in Silverton, a Victorian mining town sitting at about 9,320 feet and ringed by 13,000-foot peaks — Sultan Mountain, Kendall Mountain, and Storm Peak among them. This whole route was first cut as a toll road by "Pathfinder of the San Juans" Otto Mears in 1882–83 to haul silver ore out of the Red Mountain Mining District. When the mines played out, the road stayed — and was later folded into the San Juan Skyway scenic byway, Colorado's grand 236-mile mountain loop.

Leaving Silverton, the highway climbs through Mineral Creek valley toward Red Mountain Pass. This is mining country in its rawest form: the remains of the Yankee Girl, Longfellow, and Idarado mines still stand along the slopes, with the rust-red iron-oxide coloration that gives Red Mountain its name. There are pull-offs along the climb — use them. The views get bigger with every switchback, and the road gets narrower.

The summit of Red Mountain Pass at 11,018 feet is the highest point on the route and one of the highest paved through-roads in the United States. From here, northbound drivers drop into the Uncompahgre Gorge, where US 550 was literally blasted into near-vertical quartzite cliffs. Curves on this descent call for 15 mph or less, and the highway clings to the mountainside with very little margin for error on either side. It is, to put it plainly, the most dramatic stretch of pavement in Colorado — and possibly in the country.

Then the gorge opens up, and Ouray appears below: "Little Switzerland of America," as Visit Durango puts it, tucked into a box canyon with its own waterfall and natural hot springs. Twenty-five miles, and you've crossed from one century into another.

Why "Million Dollar"?

Nobody knows for sure — and that's part of the fun. The leading theories are all part of local lore:

• The expensive road: it cost a fortune to carve a road through this terrain, with some accounts putting construction or later paving costs at a million dollars per mile.
• The ore-rich gravel: builders reportedly used fill dirt from nearby gold and silver mines — dirt so rich in ore it was said to be worth a million dollars itself.
• The vertigo quote: an early traveler, rattled by the steep, winding route, supposedly swore he wouldn't drive it again even if you paid him a million dollars.
• The views: the drive delivers million-dollar scenery at every turn.

Take your pick. Every version fits the road.

Stops worth making

• Silverton — arrive early and walk the main street before you drive. The town's mining-era buildings are the prologue to everything you'll see on the road.
• Red Mountain Pass overlooks — the formal pull-offs near the summit give you the three Red Mountains and the mining-district ruins in one panorama. On a clear day the contrast between the orange-red slopes and the green valley is something else.
• Yankee Girl Mine viewpoint — the standout ruin along the pass, worth the short stop to read the interpretive signs about the district's 1880s boom.
• Uncompahgre Gorge pull-offs — the few turnouts on the descent north of the pass are your only safe chance to look back up at the cliffs you've just driven down.
• Ouray — the "Little Switzerland" itself: walk the main street, see the box canyon waterfall, and soak in the hot springs. The surrounding peaks make every direction a postcard.

Much of the route runs through the San Juan National Forest, so the pull-offs and trailheads along the way are your gateway to the high country beyond the pavement — but leave the gravel side roads to high-clearance vehicles.

Driving it: tips for the season ahead

1. Check conditions before you go. This is a high-alpine road where weather moves fast. CDOT posts current conditions, closures, and chain-law status at COtrip.org — and CDOT's travel page covers winter driving resources for the whole state. Check both the morning of your drive.
2. Respect the season. The snow season starts in October, and Red Mountain Pass is no stranger to early and late storms. In winter, CDOT runs avalanche-control operations here — all 70 named avalanche paths that cross US 550 between Ouray and Silverton are monitored — and the pass can close for hours or, in big cycles, for weeks.
3. Carry traction gear from September through May. Colorado's must-carry chain law covers all of US 550 from September 1 to May 31, so don't be caught without chains or approved alternate traction devices and tires with adequate tread.
4. Drive the daylight hours. With long guardrail-free stretches and steep drop-offs, this road is best driven in full daylight when you can see the edge — and the views.
5. Let faster traffic pass. The 15-mph switchbacks on the gorge descent frustrate locals too. Pull over where it's safe and let the line behind you go.
6. In winter, only go if you know what you're doing. The pass is paved year-round and plowed when conditions allow, but chain laws, whiteouts, and avalanche closures are part of the deal. If you're not experienced with serious winter mountain driving, save this one for the warm months — another high-country giant, Beartooth Highway, takes a similar seasonal beating for good reason.

When to go

Late June through mid-October is the sweet spot: the road is reliably open, wildflowers line the upper slopes in July, and the whole corridor is at its greenest. September and October bring the show-stopper — the San Juan Skyway has been called possibly America's greatest fall-color drive, and the aspen groves on the Silverton side of the pass burn gold against the evergreens.

Winter is for the hardcore only, but there's a payoff: the Ouray area's frozen waterfalls and the quiet of a snowbound mining town are worth a trip in their own right — just check the avalanche forecast before you point the car at the pass.

If the historic, hand-cut character of this road is what grabbed you, Colorado has more of it: Old Fall River Road in Rocky Mountain National Park is another one-lane mountain road carved from the landscape a century ago.

However you time it, give the drive a full morning or afternoon. The Million Dollar Highway isn't a commute — it's the destination. Roll the windows down in the gorge, pull over at every overlook, and read the mine ruins like the history book they are. Roads like this don't get built anymore.