Blue Diamond Trail (old) is a hiking trail in Brown County and Monroe County, Indiana. It is within Hoosier National Forest. It is 3.8 miles long and begins at 836 feet altitude. Traveling the entire trail is 7.6 miles with a total elevation gain of 1,236 feet. The Terrill Ridge Road (elevation 823 feet) reservoir can be seen along the trail. There is also a camp site along the trail.
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