FILE - This Oct. 10, 2009 file photo shows a raft approaching the remains of the Savage Rapids Dam through 88 years of sediment build-up on the Rogue River near Rogue River, Ore. Scientists at Oregon State University have found that insect life quickly recovered after this dam and another on the Calapooia River were removed, and the geological structure of the rivers was not far behind. (AP Photo/Jeff Barnard)