Antelope Dam
Antelope Dam is a gravity dam located in Natrona County, Wyoming, built in 1956. It carries a Low hazard potential classification and has a fair condition assessment.
About Antelope Dam
The primary purpose of Antelope Dam is debris control. The dam is designed to catch sediment, rocks, and debris carried by flowing water — particularly important in areas prone to mudslides or heavy erosion. The dam is owned by Doi Blm (federal). It impounds the Antelope Draw.
The dam stands 25 feet tall and stretches 482 feet across, creates a reservoir covering 7 acres, has a maximum storage capacity of 96 acre-feet, and collects water from a drainage area of 3 square miles. 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 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 07/20/2017.
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Location
| State | Wyoming |
| County | Natrona |
| River/Stream | Antelope Draw |
| Coordinates | 43.18612, -107.30590 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 25 ft |
| Dam Length | 482 ft |
| Year Completed | 1956 (70 years old) |
Storage & Hydraulics
| NID Storage | 96 acre-ft |
| Max Storage | 96 acre-ft |
| Normal Storage | 42 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 300 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Debris Control |
| Owner | DOI BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 07/20/2017 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01434 |
| Federal ID | WY01434 |
| More Info | State Dam Safety Program |