EXHIBIT 8.1 [LETTERHEAD OF FOSTER PEPPER TOOZE LLP] Western Sierra Bancorp 4080 Plaza Goldorado Circle Cameron Park, California 95682 Umpqua Holdings Corporation One SW Columbia Street, Suite 1200 Portland, Oregon 97258 Re: Mergers Pursuant to...Umpqua Holdings Corp • April 13th, 2006 • Savings institution, federally chartered
Company FiledApril 13th, 2006 Industry