Gillette
Gillette is an earth dam located in Campbell County, Wyoming, built in 1908. It carries a Low hazard potential classification and has a fair condition assessment.
About Gillette
The primary purpose of Gillette is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City Of Gillette (local government). It impounds the Stonepile Creek Trib Donkey Cr near Gillette.
The dam stands 10 feet tall and stretches 3,200 feet across, creates a reservoir covering 145 acres, and has a maximum storage capacity of 2,680 acre-feet. Completed in 1908, 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 07/22/2025.
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Location
| State | Wyoming |
| County | Campbell |
| Nearest City | Gillette |
| River/Stream | Stonepile Creek Trib Donkey Cr |
| Coordinates | 44.30240, -105.49700 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 3,200 ft |
| Year Completed | 1908 (118 years old) |
Storage & Hydraulics
| NID Storage | 2,680 acre-ft |
| Max Storage | 2,680 acre-ft |
| Normal Storage | 2,080 acre-ft |
| Surface Area | 145 acres |
| Spillway Type | None |
Ownership & Safety
| Purpose | Water Supply |
| Owner | CITY OF GILLETTE |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 07/22/2025 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01033 |
| Federal ID | WY01033 |
| More Info | State Dam Safety Program |