Mill D South Trail is a hiking, biking, and horse trail in Salt Lake County, Utah. It is within Uinta-Wasatch-Cache National Forest. It is 3.1 miles long and begins at 7,620 feet altitude. Traveling the entire trail is 4.3 miles with a total elevation gain of 1,295 feet. The Baby McKee Mine (elevation 9,262 feet) and Price Tunnel (elevation 8,425 feet) quarries and the Montreal Spring can be seen along the trail. The trail ends near the Howell Tunnel (elevation 8,868 feet) quarry.
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