Sedgwick
Sedgwick is an earth dam located in Weston County, Wyoming, built in 1962. It carries a Low hazard potential classification and has a poor condition assessment.
About Sedgwick
The primary purpose of Sedgwick 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 Black Thunder Wyoming Ranches Llc (private). It impounds the Alkali Creek near Edgemont, S.d..
The dam stands 25 feet tall and stretches 781 feet across, creates a reservoir covering 25 acres, and has a maximum storage capacity of 169 acre-feet. Completed in 1962, 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 05/01/2025.
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Location
| State | Wyoming |
| County | Weston |
| Nearest City | Edgemont, S.d. |
| River/Stream | Alkali Creek |
| Coordinates | 43.55190, -104.41300 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 21 ft |
| Dam Length | 781 ft |
| Year Completed | 1962 (64 years old) |
Storage & Hydraulics
| NID Storage | 169 acre-ft |
| Max Storage | 169 acre-ft |
| Normal Storage | 112 acre-ft |
| Surface Area | 25 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | BLACK THUNDER WYOMING RANCHES LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 05/01/2025 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00815 |
| Federal ID | WY00815 |
| More Info | State Dam Safety Program |