Windmill No. 1
Windmill No. 1 is an earth dam located in Niobrara County, Wyoming, built in 1956. It carries a Low hazard potential classification and has a poor condition assessment.
About Windmill No. 1
The primary purpose of Windmill No. 1 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 D & W Livestock Company, Inc. (private). It impounds the South Fork Windmill Draw near Edgemont, Sd.
The dam stands 50 feet tall and stretches 763 feet across, creates a reservoir covering 29 acres, and has a maximum storage capacity of 649 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 08/30/2022.
At 50 feet, this dam is taller than 93% of dams nationwide.
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Location
| State | Wyoming |
| County | Niobrara |
| Nearest City | Edgemont, Sd |
| River/Stream | South Fork Windmill Draw |
| Coordinates | 43.44820, -104.75180 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 50 ft |
| Dam Height | 50 ft |
| Dam Length | 763 ft |
| Year Completed | 1956 (70 years old) |
Storage & Hydraulics
| NID Storage | 649 acre-ft |
| Max Storage | 649 acre-ft |
| Normal Storage | 490 acre-ft |
| Surface Area | 29 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | D & W LIVESTOCK COMPANY, INC. |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 08/30/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00440 |
| Federal ID | WY00440 |
| More Info | State Dam Safety Program |