Briones to Mt. Diablo Regional Trail is a hiking, biking, and horse trail in Walnut Creek, California. It is within Shell Ridge Open Space and Mount Diablo State Park. It is 5.6 miles long and begins at 214 feet altitude. Traveling the entire trail is 6.3 miles with a total elevation gain of 1,288 feet. Along the trail there are a water and a reservoir.
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