Removal of two dams built on the Elwha River, Washington, in the early 20th century will allow spawning salmon to access to pristine reaches of the river that lie within the Olympic National Park.
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What happens when there isn't enough oxygen in the ocean? Our guide to hypoxia and 'dead zones.'
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Revised: 2014-01-16 | You are here: http://oceanservice.noaa.gov