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Old Big Oak Flat Road is a hiking, biking, and horse trail in Tuolumne County and Mariposa County, California. It is within Yosemite National Park. It is 6.9 miles long and begins at 7,023 feet altitude. Traveling the entire trail is 3.9 miles with a total elevation gain of 898 feet. The Tioga Road in Winter information map and the Tuolumne Grove parking and trailhead parking are near the trailhead. There are also waste baskets, recyclings, restrooms, and an information board. Along the trail there is an information map. The trail ends near the Tuolumne Grove (elevation 5,702 feet) wood, the Viewpoint for Giant Sequoias viewpoint, and the Tunnel Tree attraction. There are also trees near the end of the trail.