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 camping, although there are no recreational facilities. Only primitive camping is available at the reservoir; most areas for camping are located below the dam in the canyon.