Gammon
Gammon is an earth dam located in Johnson County, Wyoming, built in 1974. It carries a Low hazard potential classification and has a poor condition assessment.
About Gammon
The primary purpose of Gammon is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by T-a Ranch, Llp (private). It impounds the T. A. Creek.
The dam stands 34 feet tall and stretches 1,120 feet across, creates a reservoir covering 8 acres, has a maximum storage capacity of 86 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1974, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected 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 06/21/2021.
At 34 feet, this dam is taller than 80% of dams nationwide.
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Location
| State | Wyoming |
| County | Johnson |
| River/Stream | T. A. Creek |
| Coordinates | 44.15270, -106.69590 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 34 ft |
| Dam Height | 24 ft |
| Dam Length | 1,120 ft |
| Year Completed | 1974 (52 years old) |
Storage & Hydraulics
| NID Storage | 86 acre-ft |
| Max Storage | 86 acre-ft |
| Normal Storage | 46 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 271 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | T-A RANCH, LLP |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 06/21/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01647 |
| Federal ID | WY01647 |
| More Info | State Dam Safety Program |