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Ah Pah Dam

Coordinates: 41°25′19″N 123°56′09″W / 41.422038°N 123.935909°W / 41.422038; -123.935909
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Ah Pah Dam
Approximate extent of the planned reservoir
CountryUnited States
LocationHumboldt County, Northern California
StatusUnbuilt
Owner(s)U.S. Bureau of Reclamation
Dam and spillways
Type of damConcrete thick arch
ImpoundsKlamath River
Height813 ft (248 m)
Length3,500 ft (1,100 m)
Reservoir
Total capacity15,000,000 acre⋅ft (19 km3)
Catchment area14,700 sq mi (38,000 km2)
Power Station
Installed capacity900–1,700 MW

Ah Pah Dam was a proposed dam on the Klamath River in the U.S. state of California proposed by the United States Bureau of Reclamation as part of its United Western Investigation study in 1951. It was to have been 813 feet (248 m) high and was to be located 12 miles (19 km) upstream of the river's mouth. It would have been taller than any existing dam in the United States and it would stand almost as tall as the Transamerica Pyramid building in San Francisco, but would have been much more massive. It would have flooded 40 miles (64 km) of the Trinity River, including the Yurok, Karuk and Hupa Indian Reservations, the lower Salmon River, and 70 miles (110 km) of the Klamath River, creating a reservoir with a volume of 15,000,000 acre-feet (19 km3) – three fifths the size of Lake Mead, and over three times the size of the current largest reservoir in California, Shasta Lake. The water would flow by gravity through a tunnel 60 miles (97 km) long to the Sacramento River just above Redding and onward to Southern California, in an extreme diversion plan known as the Klamath Diversion. The tunnel would have been located near the southernmost extent of the reservoir. It was named in the language of the Yurok people.

References

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  • Cadillac Desert, Marc Reisner, revised edition, Penguin US, (1993), ISBN 0-14-017824-4
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41°25′19″N 123°56′09″W / 41.422038°N 123.935909°W / 41.422038; -123.935909