Dimensions
Mammoth Pool is a rockfill structure standing 411 feet (125 m) above the foundations and 820 feet (250 m) long. The dam rises for 330 ft (100 m) above the bed of the San Joaquin River, and contains about 5,250,000 cu yd (4,010,000 m3) of material. The crest is situated at an elevation of 3,361 ft (1,024 m) and is approximately 30 ft (9.1 m) wide. The dam's base, by contrast, is more than 2,100 ft (640 m) thick.
The reservoir formed behind the dam has a conservation storage of 119,940 acre·ft (0.14794 km3), a maximum capacity of 123,000 acre·ft (0.152 km3), and can reach elevations of 3,337 ft (1,017 m) above sea level. Normal water releases from the dam are controlled by a cone (Howell-Bunger) valve with a capacity of 2,100 cu ft/s (59 m3/s) at maximum pool. Any higher water will flow over an uncontrolled ogee crest spillway cut into the rock of the San Joaquin Canyon about a quarter of a mile to the west of the main dam. The spillway is 403 ft (123 m) wide and has a capacity of approximately 170,000 cu ft/s (4,800 m3/s).
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—Ralph Waldo Emerson (1803–1882)
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—Henry David Thoreau (1817–1862)