Merwin
Washington — Cowlitz County
Location
| State | Washington |
| County | Cowlitz |
| Coordinates | 45.95720, -122.55620 |
Physical Characteristics
| NID Height | 313 ft |
| Dam Height | 313 ft |
| Dam Length | 1,250 ft |
| NID Storage | 422,000 acre-ft |
| Max Storage | 422,000 acre-ft |
| Surface Area | 3,921 acres |
Safety Classification
| Hazard Potential | High |
| Condition Assessment | Fair |
| EAP Status | — |
| Last Inspection | — |
| Inspection Frequency | 1 |
Dam Information
| Year Completed | 1931 |
| Primary Purpose | Hydroelectric |
| Dam Type | — |
| Owner Type | — |
| Owner | PacifiCorp |
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.