Ewen is an earth dam located in Big Horn County, Wyoming, built in 1946. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 40 ft40 ft tall and 235 ft long, taller than 86% 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 Ewen
The primary purpose of Ewen is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Horse Creek Properites LLC (lessee) (private). It impounds the Beaver Creek near Greybull.
The dam stands 40 feet tall and stretches 235 feet across, creates a reservoir covering 9 acres, and has a maximum storage capacity of 184 acre-feet. Completed in 1946, the structure is well-established, with more than 75 years of service.
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 07/20/2022.
At 40 feet, this dam is taller than 86% of dams nationwide.
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Location
| State | Wyoming |
| County | Big Horn |
| Nearest City | Greybull |
| River/Stream | Beaver Creek |
| Coordinates | 44.57660, -107.82180 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 40 ft |
| Dam Height | 40 ft |
| Dam Length | 235 ft |
| Year Completed | 1946 (80 years old) |
Storage & Hydraulics
| NID Storage | 184 acre-ft |
| Max Storage | 184 acre-ft |
| Normal Storage | 132 acre-ft |
| Surface Area | 9 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Horse Creek Properites LLC (lessee) |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 07/20/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01157 |
| Federal ID | WY01157 |
| More Info | State Dam Safety Program |