Bay Delta Protection

The San Francisco Bay Delta, a freshwater body formed where the Sacramento, San Joaquin and several smaller rivers meet, near the city of Stockton, is the largest natural esturary on the West Coast. It covers more than 1,100 square miles, an area about three times the size of the City of San Diego. It provides breeding grounds and habitat for a range of animals, including salmon.

The Bay Delta's ecosystem has dramatically declined because of excessive water diversions, introduced nonnative invasive species, and water pollution.

Now the Bay Delta's future and function is threatened by a proposal to build two 30-mile-long, four-story-in-diameter pipes to divert water from above the Delta to parts below the estuary. Sierra Club California opposes the construction of these giant tunnels. Instead, we believe Californians should pursue a range of other strategies that together will sustainably meet water needs while protecting the environment.

Fact Sheets, Position Papers and Other Relevant Documents

Clean, Sustainable and Reliable Water Supply: Alternatives to the Giant Bay Delta Tunnels a white paper produced by the Sierra Club California Water Committee 

Fact sheet on Sierra Club California position on giant Bay Delta tunnels

Letter to Governor Brown re Sierra Club California concerns about the giant bay delta tunnels