Porcupine Dam (National ID # UT00251) is a dam in East Canyon in Cache County, Utah, United States.
The earthen dam was constructed in 1964 by the Porcupine Reservoir Company, with a height of and a length of at its crest. It impounds the water of the East Fork of the Little Bear River, primarily for irrigation.
The reservoir it creates, Porcupine Reservoir, has a water surface of , a shoreline of about , and a maximum capacity of , with an elevation of . The lake is popular for fishing, boating, and swimming, although there are no recreational facilities. Overnight camping is not available at the reservoir or below the dam in the canyon. All areas are day-use only.
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