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History Rock Trail offers mountain bike opportunities in summer months. Length: 4.0 miles Trail Begins: 10 miles up Forest Service Road 62 (Hyalite Canyon Road).Trail Ends: Trail 422 (South Cottonwood Creek) Area Map: Gallatin National Forest Visitor Map USGS Map1: Fridley Peak.USGS Map2: Mount Blackmore.Township 4S; Range 6E; Section 9
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