Coal Bank Pass, elevation , is a mountain pass in the San Juan Mountains of western Colorado in the United States. The pass is in the San Juan National Forest. Route The pass is traversed by the Million Dollar Highway, U.S. Highway 550 south of Silverton, which is part of the San Juan Skyway Scenic Byway. While the north side is fairly gentle, the descent on the south side is very steep (6.5%), and has a runaway truck ramp for trucks that lose control. It is basically downhill the entire way to Durango. References Mountain passes of Colorado Landforms of San Juan County, Colorado San Juan Mountains (Colorado) San Juan National Forest Transportation in San Juan County, Colorado U.S. Route 50