California’s ambitious plan to tunnel under the West’s largest estuary has always had two primary goals: to restore imperiled native fish and to improve water deliveries to farms and cities. An early analysis by federal wildlife agencies, however, indicates the project might make life worse for fish. The so-called WaterFix project calls for building two giant tunnels under the Sacramento-San Joaquin Delta, a tidal estuary that nurtures the largest salmon run on the West Coast.