Garnett
Garnett is an earth dam located in Big Horn County, Wyoming, built in 1944. It carries a Significant hazard potential classification and has a poor condition assessment.
About Garnett
The primary purpose of Garnett is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Powers Family Trust, Gene A. And Louise S. Powers Trustees (private). It impounds the Shell Creek Trib Bighorn River near Greybull.
The dam stands 30 feet tall and stretches 430 feet across, creates a reservoir covering 16 acres, has a maximum storage capacity of 185 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1944, the structure is well-established, with more than 75 years of service.
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 05/11/2021.
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Location
| State | Wyoming |
| County | Big Horn |
| Nearest City | Greybull |
| River/Stream | Shell Creek Trib Bighorn River |
| Coordinates | 44.50430, -108.00860 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 430 ft |
| Year Completed | 1944 (82 years old) |
Storage & Hydraulics
| NID Storage | 185 acre-ft |
| Max Storage | 185 acre-ft |
| Normal Storage | 133 acre-ft |
| Surface Area | 16 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | POWERS FAMILY TRUST, GENE A. AND LOUISE S. POWERS TRUSTEES |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 05/11/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01103 |
| Federal ID | WY01103 |
| More Info | State Dam Safety Program |