SFChronicleEnvironment

REDDING - JULY 7: U.S. Fish & Wildlife fish biologist Sarah Austing surveys and tags a dead salmon while working alongside and technicians with Pacific States Marine Fisheries Commission biologists to spear and survey the amount of dead winter-run Chinook salmon due to low-level, warming water in the Sacramento River in Redding, Calif. Wednesday, July 7, 2021. Sacramento winter-run chinook salmon, which migrates from the Golden Gate in winter each year and spawns just below Shasta Dam in the Sacramento River in spring and summer, is an endangered species that is increasingly at risk from drought. (Jessica Christian/San Francisco Chronicle via Getty Images)