Dust and debris fly as explosives are set off on the Marmot Dam on the Sandy River near Sandy, Ore., Tuesday, July 24, 2007, in the first step towards its, complete removal. Removal of the  47-foot tall dam will make the Sandy River a free-flowing river from Mount Hood glaciers to its' mouth at the Columbia River for the first time in 95 years.(AP Photo/Don Ryan, Pool)

Dust and debris fly as explosives are set off on the Marmot Dam on the Sandy River near Sandy, Ore., Tuesday, July 24, 2007, in the first step towards its, complete removal. Removal of the 47-foot tall dam will make the Sandy River a free-flowing river from Mount Hood glaciers to its' mouth at the Columbia River for the first time in 95 years.(AP Photo/Don Ryan, Pool)

 Don Ryan / The Associated Press
 

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