what are the dams of this river?
Grand Coulee Dam.
Columbia River
 One of its major undertakings was building Grand Coulee Dam to provide irrigation for the of the Columbia Basin Project in central Washington. 
what is hanford site? A decommissioned nuclear production complex. where is it located? On the Columbia River in Benton County. where is this river's course? It flows northwest and then south into the US state of Washington.
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Columbia River [SEP] Dams
In 1902, the United States Bureau of Reclamation was established to aid in the economic development of arid western states. One of its major undertakings was building Grand Coulee Dam to provide irrigation for the of the Columbia Basin Project in central Washington. With the onset of World War II, the focus of dam construction shifted to production of hydroelectricity. Irrigation efforts resumed after the war. River development occurred within the structure of the 1909 International Boundary Waters Treaty between the US and Canada. The United States Congress passed the Rivers and Harbors Act of 1925, which directed the Army Corps of Engineers and the Federal Power Commission to explore the development of the nation's rivers.