Rathbun Irrigation No. 1 is an earth dam located in Hot Springs County, Wyoming, built in 1956. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 29 ft29 ft tall and 280 ft long, taller than 65% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Rathbun Irrigation No. 1
The primary purpose of Rathbun Irrigation No. 1 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Pure Wyoming LLC (private). It impounds the Dry Fork W Kirby Creek near Kirby.
The dam stands 29 feet tall and stretches 280 feet across, creates a reservoir covering 3 acres, and has a maximum storage capacity of 38 acre-feet. Completed in 1956, 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 09/15/2022.
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Location
| State | Wyoming |
| County | Hot Springs |
| Nearest City | Kirby |
| River/Stream | Dry Fork W Kirby Creek |
| Coordinates | 43.51760, -107.83200 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 29 ft |
| Dam Height | 29 ft |
| Dam Length | 280 ft |
| Year Completed | 1956 (70 years old) |
Storage & Hydraulics
| NID Storage | 38 acre-ft |
| Max Storage | 38 acre-ft |
| Normal Storage | 23 acre-ft |
| Surface Area | 3 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Pure Wyoming LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 09/15/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01095 |
| Federal ID | WY01095 |
| More Info | State Dam Safety Program |