‘Extreme draining’ of Oregon reservoir eliminates invasive species, helps endangered salmon

Oregonian - 05-21

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Turns out, if you want a river to act like it did before it was dammed, you just have to drain the reservoir the dam created. Letting a river return to its natural course, even if only for a brief period, has other benefits, too. Invasive species disappear and endangered species, like the imperiled salmon of the Willamette River basin, get an extra boost.