Merwin
High HazardFair ConditionEmergency Action Plan: Yes
Location
| State | Washington |
| County | Cowlitz |
| Nearest City | Woodland, WA |
| River/Stream | Lewis River |
| Coordinates | 45.95720, -122.55620 |
Physical Characteristics
| Dam Type | Arch |
| NID Height | 313 ft |
| Dam Height | 313 ft |
| Dam Length | 1,250 ft |
| Year Completed | 1931 (95 years old) |
Storage & Hydraulics
| NID Storage | 422,000 acre-ft |
| Max Storage | 422,000 acre-ft |
| Normal Storage | 422,000 acre-ft |
| Surface Area | 3,921 acres |
| Drainage Area | 726 sq mi |
| Max Discharge | 120,000 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | PacifiCorp |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 04/19/2022 |
| Emergency Action Plan | Yes |