Fishermen ply the waters of the Sacramento River near Redding in October. The winter-run Chinook salmon population has declined down to a few thousand fish that manage to run out of the San Francisco Bay and return to spawn below a dam near Redding.

(Luis Sinco/Los Angeles Times)

By James Pogue • June 27, 2021

In mid-June, California’s State Water Resources Control Board wrote a tragic letter. The board, which has significant powers under California’s Constitution to manage water for the benefit of California’s people and ecosystems, wrote that it would approve a plan for water releases out of Lake Shasta that risk destroying the Sacramento River’s iconic winter-run Chinook salmon population forever.

The winter-run Chinook population has already declined by 99%, down to a few thousand fish that manage to run out of the San Francisco Bay and return to spawn below a dam near Redding. Baby salmon need cold water to hatch from their eggs and grow until they’re ready to migrate to the ocean. But in this drought year, the Federal Bureau of Reclamation has proposed drawing down the levels in Lake Shasta — California’s largest reservoir — to deliver water to irrigators in the Central Valley, allowing the diminished reservoir to heat up over the summer to temperatures that when released into the river “could increase the risk of extinction significantly,” as the board’s own letter put it.

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