Lower Monumental Dam, Little Goose Dam and Lower Granite Dam — has long been a contentious one that has generally split along party lines. Shown is the Ice Harbor Lock and Dam, the first of four ...

The report found that across the four reservoirs created by the Ice Harbor, Lower Monumental, Little Goose and Lower Granite dams, about 30,400 acre-feet of water is lost each year to evaporation.