Yellowtail Afterbay Dam
Montana — Big Horn County — BIGHORN RIVER
Location
| State | Montana |
| County | Big Horn |
| River | BIGHORN RIVER |
| Coordinates | 45.31630, -107.92160 |
Physical Characteristics
| NID Height | 72 ft |
| Dam Height | 59 ft |
| Dam Length | 1,360 ft |
| NID Storage | 2,877 acre-ft |
| Max Storage | 2,877 acre-ft |
| Surface Area | 181 acres |
Safety Classification
| Hazard Potential | High |
| Condition Assessment | Not Available |
| EAP Status | Yes |
| Last Inspection | April 25, 2023 |
| Inspection Frequency | 4 |
Dam Information
| Year Completed | 1966 |
| Primary Purpose | Hydroelectric |
| Dam Type | Concrete |
| Owner Type | Federal |
| Owner | BUREAU OF RECLAMATION |
| Other Name | Yellowtail Afterbay Reservoir |
Location Map
About This Dam Record
Dam safety data is maintained by the Army Corps of Engineers National Inventory of Dams (NID). High-hazard dams are those where failure could cause loss of life or major property damage downstream.