(Portland, OR) -- Four conservation and fishing groups have given the U.S. Army Corps of Engineers notice they plan to file a lawsuit over hot water conditions in the Snake River. They say despite above-average snowpack and a colder spring, higher water temperatures threaten endangered salmon. They want four dams on the Snake River to be removed. Opponents argue that removing hydroelectric dams will make climate change worse causing more problems for salmon. The Corps has argued the courts don't have the authority to order the dams to be removed, but conservationists say the Endangered Species Act would allow it.