An Army Corps of Engineers’ hydrology study estimates that 100 million
to 150 million cubic yards of sediment is stored behind the four lower
Snake River dams and that as much as half that sediment will move downstream
over time to the McNary Dam pool if Congress chooses to breach the four
dams.
The study is a part of the Corps’ "Lower Snake River Juvenile Salmon
Migration Feasibility Study," which looks at three major options for
the four dams: status quo; status quo with …