O'Shaughnessy Dam
in
Yosemite

Named for the chief engineer, the O’Shaughnessy Dam was completed in 1938 and is 430-feet tall. Today the 117-billion-gallon reservoir supplies drinking water to about 2.5 million San Francisco Bay Area residents and industrial users. It also supplies hydro-electric power generated by two plants downstream. The reservoir is eight miles long and the largest single body of water in Yosemite.

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