Clifton Court Forebay is a reservoir in the San Joaquin River Delta region of eastern Contra Costa County, California, 17 mi (27 km) southwest of Stockton.

[4] If a large enough earthquake happens near or at the Clifton Court Forebay, the California water system for irrigation and municipal use will be adversely affected.

[citation needed] The Clifton Forebay is a wetland system that drained nearby small rivers into the Pacific Ocean.

[citation needed] A documentary about the decline of the United States' infrastructure, The Crumbling of America,[5] was commissioned by the U.S. A&E network in the late 2000s.

It features the Clifton Court Forebay as a "strategic piece of California freshwater infrastructure" subject to shutdown for up to two years if struck by an earthquake of magnitude 7.5 or greater.