Slumgullion Pass is a high mountain pass at an elevation of 3.514m (11,530ft) above the sea level, located in Hinsdale County, in southwestern Colorado, USA. It claims the steepest grades of any fully paved and maintained road in Colorado.
Located in the San Juan Mountains, the road over the pass is asphalted. 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%).
Is Slumgullion Pass dangerous?
Drive at moderate speed. You’re not on a race. 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.
Is Slumgullion Pass open?
This narrow two lane road is maintained year-round because snowplows clear the route regularly during this season. But beware poor conditions in winter. 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 percentage 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.
How long is Slumgullion Pass?
The pass is 80km (50.0 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 1 mile west of the pass, offers views of numerous peaks that are above 13,000 feet.