The Lower Snake River in Washington state was declared the most endangered waterway in the U.S. today by the environmental group American Rivers. Others in the group’s annual list of the most endangered rivers included the Missouri, the Ventura in California, and the Copper in Alaska. The Snake made the top of the list because the group says that four dams on the river have brought salmon runs to the brink of extinction. Enviros are waging a national campaign to breach the dams. Meanwhile, a separate study released today by two other enviro groups found that the electric power provided by the dams on the Snake could be replaced for as little as $1 to $3 a month per household by investing in wind, solar, and geothermal energy, as well as energy conservation.