Here.
An excerpt:
A case in point is the Elwha River on the Olympic Peninsula in Washington, where two hydroelectric dams built early in the last century exacted huge environmental costs but were no longer important as power generators. Salmon runs that once reached about 400,000 fish a year dropped to fewer than 3,000. A year after the Elwha Dam was removed, Chinook salmon returned to the river in numbers not seen in decades, with three-quarters of them observed spawning upstream of the former dam site. Today, the river runs free from its headwaters in Olympic National Park to the Strait of Juan de Fuca, and a terrible wrong imposed on the salmon-dependent Lower Elwha Klallam tribe has been righted.
Turtle Talk 