SAN FRANCISCO | State and federal wildlife officials are resorting to installing giant water chillers in some of California's fish hatcheries, as drought, over-allocation of water and climate change all combine this year to make temperatures too warm for some baby salmon and other fish to survive.

U.S. Fish and Wildlife Service workers installed the coolers at the Livingston Stone National Fish Hatchery at the foot of northern California's Shasta Dam this summer when water temperatures hit the mid-60s — too tepid for the half-million winter-run baby salmon growing there, said Scott Hamelberg, a federal hatchery manager.

The winter-run salmon are endangered, and the coolers lower the water temperature to a more livable 60 degrees, he said.

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