WASHINGTON - Banks are not the only ones struggling in the growing financial crisis.

The fund established to insure their deposits is also feeling the pinch, and the taxpayer may be the lender of last resort. The level set by Congress, could be forced to tap tax dollars through a Treasury Department loan if Washington Mutual Inc., the nation's largest thrift, or another struggling rival fails, economists and industry analysts said Tuesday.

Treasury has already come to the rescue of several corporate victims of the housing and credit crunches. The government took over mortgage finance companies Fannie Mae and Freddie Mac, and helped finance the sale of investment bank Bear Stearns to J.P. Morgan Chase & Co.

Eleven federally insured banks and thrifts have failed this year, including Pasadena, Calif.-based IndyMac Bank, by far the largest shut down by regulators.

Additional failures of large banks or savings and loans companies seem likely, and that could overwhelm the FDIC's insurance fund, said Brian Bethune, U.S. economist at consulting firm Global Insight.

'We've got a ... retail bank run forming in this country,' said Christopher Whalen, senior vice president and managing director of Institutional Risk Analytics. .....