An entire run of endangered winter-run chinook salmon, as well as the fall-run salmon that make up the core of the California fishery, are in danger of being wiped out this year if the U.S. Bureau of Reclamation keeps diverting water to farmers at its current rate. With state water resources constrained by the extreme drought, that’s the alarm that environmental, fishing and tribal groups are sounding after reports show the Sacramento River will reach dangerous temperatures during spawning season, based on federal scientific scenarios that analyze the bureau’s planned water releases. They warn of a massive die-off as bad as during the last drought, when 95% of winter-run chinook salmon eggs and young fish were wiped out in 2014 and 2015.