Big Sand Wash Dam is on the Big Sand Wash in Duchesne County, Utah and is used for irrigation purposes. Construction was completed in 1965. It is owned by Moon Lake Water Users.Big Sand Wash is of earthen construction. Its length is 795 feet. Maximum discharge is 195 cubic feet per second. Its capacity is 14600 acre feet. Normal storage is 12050 acre feet. It drains an area of 11 square miles.

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