FILE – A bathtub ring of light minerals shows the high water line of Lake Mead near water intakes on the Arizona side of Hoover Dam at the Lake Mead National Recreation Area Sunday, June 26, 2022, near Boulder City, Nev. The U.S. Interior Department announced, Friday, Oct. 28, 2022, that it will consider revising a set of guidelines for operating two major dams on the Colorado River in the first sign of what could lead to federal action to protect the shrinking reservoirs behind them. (AP Photo/John Locher, File)