Toutle River Sediment Retention Structure
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| Toutle River Sediment Retention Structure | |
 Aerial photograph looking upriver with Mt. St. Helens in the background |
|
| Official name | Sediment Retention Structure |
|---|---|
| Locale | North Fork Toutle River |
| Maintained by | US Army Corps of Engineers |
| Height | 184 ft. |
| Width (at base) | 1,888 ft. |
| Construction began | December, 1986 |
| Opening date | December, 1989 |
| Construction Cost | US$65 million |
| Reservoir information | |
| Capacity | 258 million yd³ |
| Surface area | 3,200 acres |
The Sediment Retention Structure is a 1800 foot long, 184 foot high earthen dam on the Toutle River in Washington. Its construction was completed by the US Army Corps of Engineers in 1989. Its purpose is to retain sediment created since the 1980 eruption of Mount St. Helens, to prevent the sediment from becoming a hazard to navigation on the Toutle, Cowlitz and Columbia Rivers.
The Corps of Engineers expects the lake behind the dam to be completely filled with sediment by 2035 with 258 million cubic yards (197 million m³) of sand, gravel and sediment.
[edit] External links
- Sediment Retention Structure, US Army Corps of Engineers, Portland District
