After the Dam...
All ten native Elwha River anadromous fish runs have been severely diminished and the ecosystem disrupted.

Since 1911, Elwha and Glines Canyon dams have blocked anadromous fish passage to more than 70 miles of the Elwha River and its tributaries, most within Olympic National Park. This has limited anadromous salmon and trout production to the 4.9 miles of the river below Elwha Dam, which in turn reduces nutrients for aquatic and riparian habitats.

All ten native Elwha River anadromous fish runs have been severely diminished and the ecosystem disrupted. At least one Elwha River salmon stock, the sockeye, may now be extinct while two stocks, the pink and spring chinook, may only be present in small numbers.

Sorry for the hijack. But here's a bit more.
http://www.nps.gov/archive/olym/issues/isselwha2.htm
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