Mount St. Helens Sediment Retention Structure
Washington — Cowlitz County
Location
| State | Washington |
| County | Cowlitz |
| Coordinates | 46.36247, -122.55055 |
Physical Characteristics
| NID Height | 239 ft |
| Dam Height | 186 ft |
| Dam Length | 1,800 ft |
| NID Storage | 0 acre-ft |
| Max Storage | 0 acre-ft |
| Surface Area | 0 acres |
Safety Classification
| Hazard Potential | High |
| Condition Assessment | Not Available |
| EAP Status | — |
| Last Inspection | — |
| Inspection Frequency | 5 |
Dam Information
| Year Completed | 1988 |
| Primary Purpose | Flood Risk Reduction |
| Dam Type | — |
| Owner Type | — |
| Owner | USACE - Portland District |
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.