Recent decades have brought the slow collapse of the Sacramento-San Joaquin Delta and its salmon runs. A half dozen species face extinction. Lacking natural flushing, the Delta now suffers outbreaks of toxic algae. The salmon fishing industry suffered a shutdown in 2008 and 2009 which cost thousands of jobs. Science points to a clear cause: inadequate flows caused by excessive diversions. In some years, 90 percent of the Tuolumne River is diverted, leaving only 10 percent for salmon and the Bay-Delta. Every Central Valley salmon river also suffers from over diversion in many years. Recent proposals from water users fall far short of what is needed by salmon and required by the law.