Us Forest Service Road 307 A is a hiking, biking, and horse trail in Albany County, Wyoming. It is within Medicine Bow-Routt National Forest. It is 1.5 miles long and begins at 9,488 feet altitude. Traveling the entire trail is three miles with a total elevation gain of 626 feet. The Cliff Mine (elevation 8,993 feet), Kentucky Derby Area Mine (elevation 9,098 feet), and Empire Mine (elevation 8,999 feet) quarries can be seen along the trail.