Moon Lake Dam
Moon Lake Dam is an earth dam located in Duchesne County, Utah, built in 1938. It carries a High hazard potential classification.
About Moon Lake Dam
The primary purpose of Moon Lake Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Bureau Of Reclamation (federal). It impounds the Lake Fork River near Myton.
The dam stands 101 feet tall and stretches 1,108 feet across, creates a reservoir covering 773 acres, has a maximum storage capacity of 49,500 acre-feet, and collects water from a drainage area of 112 square miles. Completed in 1938, the structure is well-established, with more than 75 years of service.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. An emergency action plan is in place for this dam. The most recent inspection on record was 09/21/2021.
At 101 feet, this dam is taller than 98% of all dams in the United States.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Utah dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Utah |
| County | Duchesne |
| Nearest City | Myton |
| River/Stream | Lake Fork River |
| Coordinates | 40.56180, -110.48830 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 101 ft |
| Dam Height | 101 ft |
| Dam Length | 1,108 ft |
| Year Completed | 1938 (88 years old) |
Storage & Hydraulics
| NID Storage | 49,500 acre-ft |
| Max Storage | 49,500 acre-ft |
| Normal Storage | 49,500 acre-ft |
| Surface Area | 773 acres |
| Drainage Area | 112 sq mi |
| Max Discharge | 10,000 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | BUREAU OF RECLAMATION |
| Owner Type | Federal |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 09/21/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | UT10128 |
| Federal ID | UT10128 |
| More Info | State Dam Safety Program |