The Missouri River is the country’s most endangered waterway, says American Rivers, which yesterday released its annual list of rivers in trouble. The group says that several species face extinction along the Missouri because of six dams run by feds to control the river for the benefit of a small amount of barge traffic. The U.S. Army Corps of Engineers will take public comments on a new operation plan for the river this summer. In all, American Rivers this year listed 13 endangered rivers, including the Canning River in the Arctic National Wildlife Refuge, the Eel River in California, and the Hudson River in New York. The group said that nearly half of the rivers on the list were threatened by the impacts of energy production (yep, a clever news hook these days).