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State, in the Pacific
Northwest region of the United States
. It rises in two forks on the flanks of
Mount St.
Helens
and joins the Cowlitz
River near Castle Rock
.
and subsequent lahars poured
vast amounts of sediment into the Toutle,
which was formerly navigable. The US Army Corps of Engineers
dredged 85 million m³ (110 million yd³) of sediment from the river
and built the US$65 million Sediment
Retention Structure
on the North Fork of the Toutle
to keep it clear in the future. Part of the same
engineering works is a tunnel to drain Spirit
Lake
whose natural outlet was blocked by the
eruption.| Embed code: |
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