- Associated Press - Wednesday, October 8, 2014

GRANTS PASS, Ore. (AP) - Scientists at Oregon State University have found that the ecosystems on two rivers quickly recovered after small dams were removed, and the geological structure was not far behind.

The study was published in the online peer-reviewed journal PLOS ONE.

It looked at insect life and riverbed geology before and after removal of Savage Rapids Dam on the Rogue and Brownsville Dam on the Calapooia.

The scientists found that the numbers and varieties of insects downstream of the dams recovered to levels elsewhere on the river within a year, despite large amounts of silt scouring the river bottom after the dams were breached.

Lead author Desiree Tullos, associate professor of biological engineering, says the findings are important in light of the growing number of aging dams being removed around the country.

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