[...] dam operators must release enough water into the Sacramento-San Joaquin River Delta in winter and spring to meet the needs of delta smelt and longfin smelt — two native fishes in trouble. Yet they also have to hold enough water in storage to keep flows in rivers cool during summer months because endangered winter-run and spring-run chinook salmon, cut off from their spawning grounds by these same dams, require cold water to support their eggs and young. Scarcity also creates tough trade-
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