Forest Road 645 is a hiking, biking, and horse trail in Price County, Wisconsin. It is within Chequamegon-Nicolet National Forest (Park Falls Landbase). It is 3.8 miles long and begins at 1,538 feet altitude. Traveling the entire trail is 7.6 miles with a total elevation gain of 532 feet. The Penny Lake water can be seen along the trail.
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