View of the O'Shaughnessy Dam at the Hetch Hetchy Reservoir, Yosemite National Park - California.
Looking out over the Hetch Hetchy Reservoir from on top of the O'Shaughnessy Dam, Yosemite National Park - California. Wapama Fall can be seen in the distance (center).
Water being drained from the Hetch Hetchy Reservoir behind the O'Shaughnessy Dam, Yosemite National Park - California.
