Mammoth Pool Dam - Environmental Impacts

Environmental Impacts

Mammoth Pool Dam has caused the submersion of a migratory route commonly used by mule deer in the Sierra, forcing them to swim across the reservoir during their spring and autumn migrations. The reservoir is closed to all public use between May 15 to June 15 to prevent disturbance of the deer population.

During late summer and autumns of most years, nearly the entire flow of the San Joaquin River is diverted into the Mammoth Pool penstock, essentially drying up nearly 9 miles (14 km) of riverbed. This has resulted in severe declines in fish populations in the stretch between Mammoth Pool and Dam No. 6, where the outflow from the Mammoth Pool powerhouse is located.

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