Within the 459-square-mile Hetch Hetchy watershed are 287 miles of trails, including a portion of the Pacific Crest Trail, offering views of abundant flora and fauna along with breathtaking scenery. Upstream from the dam, depending on the season, Tueeulala and Wapama falls plunge more than 1,000 feet from the tops of the cliffs into Hetch Hetchy Reservoir and are fullest from late spring to early or mid summer. Tueeulala, which dries to a trickle in the late summer, is approximately a thirty-minute hike from the dam after passing through the granite tunnel. Wapama Falls is 2.5 miles farther along the trail. Rancheria Falls, 5.4 miles from the granite tunnel adjacent to the dam, is an ambitious all-day trip with an overall elevation of 900 feet, and this popular trail traverses the granite cliffs above the reservoir and offers beautiful vistas.