Black Butte
Black Butte is an earth dam located in Sublette County, Wyoming, built in 1989. It carries a Low hazard potential classification and has a poor condition assessment.
About Black Butte
The primary purpose of Black Butte is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Twin Eagle Ranch Llc (private). It impounds the Black Butte Draw near Cora.
The dam stands 25 feet tall and stretches 230 feet across, creates a reservoir covering 17 acres, has a maximum storage capacity of 236 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1989, the structure is 37 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 07/19/2022.
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Location
| State | Wyoming |
| County | Sublette |
| Nearest City | Cora |
| River/Stream | Black Butte Draw |
| Coordinates | 43.13950, -110.05220 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 230 ft |
| Year Completed | 1989 (37 years old) |
Storage & Hydraulics
| NID Storage | 236 acre-ft |
| Max Storage | 236 acre-ft |
| Normal Storage | 151 acre-ft |
| Surface Area | 17 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 114 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | TWIN EAGLE RANCH LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 07/19/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY02043 |
| Federal ID | WY02043 |
| More Info | State Dam Safety Program |