Corps plans to raise Toutle volcano sediment dam
Monday, November 7, 2011
LONGVIEW, Wash. (AP) -- The Corps of Engineers plans to raise the sediment dam on the Toutle River near Mount St. Helens to prevent volcanic runoff from filling the Cowlitz River bed downstream and increasing the flood danger.
The corps plans to add 10 feet on top of the 125-foot-tall dam that was built 25 years ago.
The Daily News reports (http://bit.ly/tBLYJC ) the work next summer depends on congressional approval of $6.5 million requested by the Obama administration for Mount St. Helens response and monitoring.
The corps' coordinator for the project, Tim Kuhn, says the long-term plan calls for a combination of raising the spillway as much as 30 feet, periodically dredging the Cowlitz and building weirs along the Toutle to trap silt.
A channel would be left through the dam spillway for salmon.
Information from: The Daily News, http://www.tdn.com