Big Sand Wash Dam
Key Takeaway
Big Sand Wash Dam is classified as high hazard in Utah. It was completed in 1968 and is 58 years old. Its primary use is irrigation. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.
Physical Details
| Dam Length | 920 ft |
| Dam Type | Earth |
| Max Storage | 26.5K acre-ft |
| Normal Storage | 25.7K acre-ft |
| Drainage Area | 27 sq mi |
| Max Discharge | 595 cfs |
| Year Completed | 1968 (58 years old) |
| NID ID | UT53326 |
Safety Information
Loss of human life is likely if the dam fails.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
MOON LAKE WATER USERS
Private
Nearby Dams
Big Sand Wash East
Duchesne, UT
High HazardBig Sand Wash West
Duchesne, UT
High HazardSix Lakes - #3 - Totem Lake
Duchesne, UT
Low HazardSix Lakes - #1 - Eagle Lake
Duchesne, UT
Low HazardSix Lakes - #4 - Loon Lake
Duchesne, UT
Low HazardHansen No.3 (Grant)
Duchesne, UT
Low HazardHansen
Duchesne, UT
Low HazardUpper Sandwash Ranch - Honeymoon - 1
Duchesne, UT
Significant HazardFrequently Asked Questions
What is the hazard classification of Big Sand Wash Dam?
Big Sand Wash Dam is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Big Sand Wash Dam?
Big Sand Wash Dam is owned by MOON LAKE WATER USERS (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Big Sand Wash Dam built?
Big Sand Wash Dam was completed in 1968, making it 58 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
What is the primary purpose of Big Sand Wash Dam?
Big Sand Wash Dam serves the following purposes: Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Big Sand Wash Dam last inspected?
Big Sand Wash Dam was last inspected on May 10, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.