Ashley Twin Lakes
Ashley Twin Lakes is an earth dam located in Uintah County, Utah, built in 1920. It carries a Significant hazard potential classification.
About Ashley Twin Lakes
The primary purpose of Ashley Twin Lakes is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Ashley Valley Reservoir Company (private). It impounds the South Fork Of Ashley Creek near Vernal.
The dam stands 17 feet tall and stretches 400 feet across, has a maximum storage capacity of 450 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1920, the structure is over a century old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. An emergency action plan is in place for this dam. The most recent inspection on record was 08/08/2023.
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Location
| State | Utah |
| County | Uintah |
| Nearest City | Vernal |
| River/Stream | South Fork Of Ashley Creek |
| Coordinates | 40.72353, -109.79904 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 17 ft |
| Dam Length | 400 ft |
| Year Completed | 1920 (106 years old) |
Storage & Hydraulics
| NID Storage | 450 acre-ft |
| Max Storage | 450 acre-ft |
| Normal Storage | 365 acre-ft |
| Drainage Area | 1 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | ASHLEY VALLEY RESERVOIR COMPANY |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not Rated |
| Last Inspection | 08/08/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | UT00011 |
| Federal ID | UT00011 |
| More Info | State Dam Safety Program |