Slumgullion Pass

Slumgullion Pass is the steepest paved maintained road in CO

Slumgullion Pass is a high mountain pass at an elevation of 3.528m (11,574ft) above the sea level, located in Hinsdale County, in the U.S. state of Colorado. It claims the steepest grades of any fully paved and maintained road in Colorado.

Is the road to Slumgullion Pass paved?

Located in the southwestern part of Colorado, the road to the summit is totally paved. It’s called Colorado State Highway 149, also known as Silver Thread Scenic Byway. The north side has the steepest grade of any continuously paved road in Colorado (9.8%).

Is Slumgullion Pass dangerous?

At this elevation it's one of the highest mountain roads of Colorado. It has a few switchbacks and tight spots, but other than that, most travelers will find it an easy, scenic route. To reach the summit, starting from Lake City, the ascent is 11.3 km long. Over this distance, the elevation gain is 783 meters. The average gradient is 6.9 %. The climb starts out immediately with near 10% grades and other than false flat in the middle for around 1K the grade never really lets up. Elk, deer, moose, and bighorn sheep are often seen along the highway. It’s one of the steepest paved mountain passes of Colorado.

Is Slumgullion Pass open?

Set high in the San Juan Mountains, this narrow two lane road is maintained year-round because snowplows clear the route regularly during this season. But beware poor conditions in winter.

How long is Slumgullion Pass?

The pass is 80km (50 miles) long running from the town of Lake City (in Hinsdale County) to the historic city of Creede (in Mineral County). Windy Point Overlook, approximately 2 miles west of the pass, offers views of numerous peaks that are above 13,000 feet.


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