The Seattle Times has a very good report of toxic pollution of the Columbia River.
Columbia River toxins moving up food chain
By Craig Welch
Seattle Times staff reporter
VANCOUVER, Wash. — First were the crayfish near Bonneville Dam, so loaded with toxins that scientists wondered how they could still be alive.
Then researchers learned Columbia River fish were contaminated enough that nearby tribes face dramatically higher risks of disease. Scientists since have found deformed sturgeon, uranium building up in clams near the Hanford nuclear reservation, and water in parts of the last stretch of the river as contaminated as Seattle's Duwamish River, a federal Superfund site.
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