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Originally published Tuesday, March 30, 2010 at 5:08 PM

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Study seconds Army's plans for Hanson Dam

An independent review substantially backs the Army Corps of Engineers' plans to shore up a reservoir wall at Howard Hanson Dam on the Green River.

The Associated Press

SEATTLE —

An independent review substantially backs the Army Corps of Engineers' plans to shore up a reservoir wall at Howard Hanson Dam on the Green River.

An abutment next to the dam was severely weakened during heavy rains in early 2009, increasing the flood danger to the heavily developed Green River Valley downstream. Since then, millions of dollars have been spent on flood preparations in the valley south of Seattle while the corps rushes to make repairs.

The review by Battelle Memorial Institute engineers agrees with the corps' efforts to inject grout in the abutment to temporarily reduce seeping. It also concurs with a proposal to build a deep concrete wall the length of the abutment as a permanent fix. In addition, it recommends updating what risks would be posed by a dam failure, along with the dam's vulnerability to earthquakes.

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