Wednesday, April 25, 2012
Telling Video on History of Dam Building in America
This short video depicts the rapid and dramatic transformation of US rivers wrought by dam construction since 1800. While several high profile dam removal projects in the Pacific Northwest have been major cause for celebration, there are literally hundreds of dams which still block salmon and steelhead from historic habitat. For instance, roughly half of the habitat in the Columbia Basin has been lost to dam construction, and the rest of the basin has been severely impacted by dams which alter hydrographs, increase river temperatures block the downstream transport of sediment, smother miles of habitat under slack water impoundments and impede migrations of juveniles and adults between the spawning grounds and the sea.