O'Neil Pass

O'Neil Pass is the Highest Road In South Dakota

O'Neil Pass is a mountain pass at an elevation of 2.046m (6,712ft) above the sea level, located in Lawrence County, in the U.S. state of South Dakota.

Is the road to O'Neil Pass in South Dakota paved?

Set high within the Black Hills National Forest, the road to the summit is paved. It’s called Canam Highway, part of the U.S. Route 85. The road to the summit is steep, hitting a 7% of maximum gradient through some of the ramps. It’s one of the highest roads of South Dakota.

How long is O'Neil Pass in South Dakota?

The pass is 40.55km (25.2 miles) long, running from Cheyenne Crossing (in Lawrence County, South Dakota) to Four Corners (in Weston County, Wyoming). Watch for wildlife. It can be very dangerous in winter months, with ice and snow on the winding road. Just past the pass, you'll find Trailshead Lodge, a year-round lodge offering cabins and snowmobiling.




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