GRANTS PASS, Ore. - A Pacific Northwest utility must build new fish ladders and take other steps to help salmon swim freely past four hydroelectric dams on the Klamath River if it wants to renew its license to produce electricity, federal fisheries agencies said Tuesday. The cost of the ladders, turbine screens and fish bypasses was estimated at nearly $300 million. The high cost could boost pressure on the utility, PacifiCorp, to remove the dams altogether — something environmentalists have been pushing for. Removing the dams would open access to 350 miles of salmon spawning habitat that have been blocked...