Keyhole
BELLE FOURCHE RIVER·
Crook, Wyoming·
Built 1951·
Earth·
168 ft tall
Physical Details
| Dam Height | 168 ft (taller than 99.4% in WY) |
| Dam Length | 3,420 ft |
| Dam Type | Earth |
| Max Storage | 629.0K acre-ft |
| Normal Storage | 334.2K acre-ft |
| Surface Area | 9,411 acres |
| Drainage Area | 1,950 sq mi |
| Max Discharge | 10,850 cfs |
| Year Completed | 1951 (75 years old) |
| NID ID | WY01380 |
Safety Information
High Hazard
Loss of human life is likely if the dam fails
Emergency Action Plan: Yes
Last Inspection: August 27, 2020
State Regulated: Yes
Regulatory Agency: SEO
Ownership
RECLAMATION
Federal Government
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Low Hazard 22 ftFrequently Asked Questions
What is the hazard classification of Keyhole?
Keyhole is classified as High Hazard. Loss of human life is likely if the dam fails.
Who owns Keyhole?
Keyhole is owned by RECLAMATION (Federal Government).
When was Keyhole last inspected?
Keyhole was last inspected on August 27, 2020.
When was Keyhole built?
Keyhole was completed in 1951, making it 75 years old.
Data from the National Inventory of Dams (NID) maintained by the US Army Corps of Engineers. Dam conditions may have changed since the last update. This site is not affiliated with USACE. Do not use for emergency planning — contact your local dam safety program.