Bonneville is an earth dam located in Fremont County, Wyoming, built in 1914. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 40 ft40 ft tall and 1,010 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 Bonneville
Bonneville is a dam in Fremont, Wyoming. The dam is owned by Flagstone Ranch, LLC (private). It impounds the Gulch Trib Badwater Creek near Thermopolis.
The dam stands 40 feet tall and stretches 1,010 feet across, creates a reservoir covering 63 acres, and has a maximum storage capacity of 681 acre-feet. Completed in 1914, the structure is over a century 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 08/28/2023.
At 40 feet, this dam is taller than 86% of dams nationwide.
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Location
| State | Wyoming |
| County | Fremont |
| Nearest City | Thermopolis |
| River/Stream | Gulch Trib Badwater Creek |
| Coordinates | 43.30583, -108.06806 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 40 ft |
| Dam Height | 40 ft |
| Dam Length | 1,010 ft |
| Year Completed | 1914 (112 years old) |
Storage & Hydraulics
| NID Storage | 681 acre-ft |
| Max Storage | 681 acre-ft |
| Normal Storage | 511 acre-ft |
| Surface Area | 63 acres |
| Max Discharge | 670 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | Flagstone Ranch, LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 08/28/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01155 |
| Federal ID | WY01155 |
| More Info | State Dam Safety Program |