CC,

There will be some sediment, including silt, accumulation and release. However the quantity will be far less than what happened on the Sauk, which was due to natural conditions at Chocolate Glacier up the Suiattle. The quantity probably won't be measurably different than the amount moved naturally by the river during any good freshet. Of course that natural sediment movement is due to unnatural logging and road building, but that is another topic.

Sg