Black Diamonds to Mt Diablo Regional Trail is a hiking, biking, and horse trail in Clayton, California. It is 3.8 miles long and begins at 443 feet altitude. Traveling the entire trail is 0.0 miles with a total elevation gain of 3 feet. The Clayton Historical Society Museum (elevation 390 feet) museum can be seen along the trail. There are also a bench, a picnic site, restrooms, a fountain, and a residential along the trail.
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