Toutle River Sediment Retention Structure

Infobox_Dam
dam_name=Sediment Retention Structure


caption=Aerial photograph looking upriver with Mt. St. Helens in the background
official_name=Sediment Retention Structure
crosses=
reservoir=
locale=North Fork Toutle River
maint=US Army Corps of Engineers
length=
height=184 ft.
width=1,888 ft.
began=December, 1986
open=December, 1989
closed=
cost=US$65 million
reservoir_capacity=258 million yd³
reservoir_catchment=
reservoir_surface=3,200 acres
bridge_carries=
bridge_width=
bridge_clearance=
bridge_traffic=
bridge_toll=
bridge_id=
map_cue=
map_

map_text=
map_width=200px
coordinates=
lat=
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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.

External links

* [https://www.nwp.usace.army.mil/op/srs/srs.asp Sediment Retention Structure] , US Army Corps of Engineers, Portland District