Paterson Lake
Paterson Lake is an earth dam located in Uinta County, Wyoming, built in 1907. It carries a Significant hazard potential classification and has a poor condition assessment.
About Paterson Lake
The primary purpose of Paterson Lake is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by John L. & Cheryl Eyre (private). It impounds the Blacks Fork River near Granger.
The dam stands 14 feet tall and stretches 1,650 feet across, creates a reservoir covering 200 acres, and has a maximum storage capacity of 1,649 acre-feet. Completed in 1907, 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. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 04/11/2025.
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Location
| State | Wyoming |
| County | Uinta |
| Nearest City | Granger |
| River/Stream | Blacks Fork River |
| Coordinates | 41.35010, -110.31120 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 1,650 ft |
| Year Completed | 1907 (119 years old) |
Storage & Hydraulics
| NID Storage | 1,649 acre-ft |
| Max Storage | 1,649 acre-ft |
| Normal Storage | 1,237 acre-ft |
| Surface Area | 200 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | JOHN L. & CHERYL EYRE |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 04/11/2025 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01248 |
| Federal ID | WY01248 |
| More Info | State Dam Safety Program |