Boysen
WIND RIVER·
Fremont, Wyoming·
Built 1951·
Earth·
220 ft tall
High Hazard
Flood Risk Reduction
Irrigation
Fish And Wildlife Pond
Recreation
Hydroelectric
Water Supply
Federal Government
Physical Details
| Dam Height | 220 ft (taller than 99.7% in WY) |
| Dam Length | 1,143 ft |
| Dam Type | Earth |
| Max Storage | 1.5M acre-ft |
| Normal Storage | 701.5K acre-ft |
| Surface Area | 19,560 acres |
| Drainage Area | 7,710 sq mi |
| Max Discharge | 20,000 cfs |
| Year Completed | 1951 (75 years old) |
| NID ID | WY01299 |
Safety Information
High Hazard
Loss of human life is likely if the dam fails
Emergency Action Plan: Yes
Last Inspection: July 30, 2020
State Regulated: Yes
Regulatory Agency: SEO
Ownership
RECLAMATION
Federal Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Boysen?
Boysen is classified as High Hazard. Loss of human life is likely if the dam fails.
Who owns Boysen?
Boysen is owned by RECLAMATION (Federal Government).
When was Boysen last inspected?
Boysen was last inspected on July 30, 2020.
When was Boysen built?
Boysen 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.