One of the worst droughts in memory in a massive agricultural region straddling the California-Oregon border could mean steep cuts to irrigation water for hundreds of farmers this summer to sustain endangered fish species critical to local tribes. The U.S. Bureau of Reclamation, which oversees water allocations in the federally owned Klamath Project, is expected to announce this week how the season’s water will be divvied up after delaying the decision a month.