Ryan
Montana — Cascade County — Missouri River
Location
| State | Montana |
| County | Cascade |
| River | Missouri River |
| Coordinates | 47.56880, -111.12510 |
Physical Characteristics
| NID Height | 82 ft |
| Dam Height | 61 ft |
| Dam Length | 1,465 ft |
| NID Storage | 3,653 acre-ft |
| Max Storage | 3,613 acre-ft |
| Surface Area | 168 acres |
Safety Classification
| Hazard Potential | High |
| Condition Assessment | Satisfactory |
| EAP Status | Yes |
| Last Inspection | July 18, 2022 |
| Inspection Frequency | 1 |
Dam Information
| Year Completed | 1915 |
| Primary Purpose | Hydroelectric |
| Dam Type | Gravity |
| Owner Type | Private |
| Owner | NorthWestern Energy |
| Other Name | Volta |
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.