EXHIBIT 23.1 CONSENT OF DELOITTE & TOUCHE LLP Deloitte & Touche LLP [Logo] ---------------------------------------------------- Suite 3900 Telephone: (503) 222-1341 111 S.W. Fifth Avenue Facsimile: (503) 224-2172 Portland, Oregon 97204-3698 Deloitte & Touche LLP Letterhead INDEPENDENT AUDITORS' CONSENT The Boards of Directors Oregon Trail Financial Corp. Pioneer Bank, a Federal Savings Bank Baker City, Oregon We consent to the use in this Amendment No. 1 to the Registration Statement on Form S-1 on behalf of Oregon Trail Financial Corp. of our report dated May 22, 1997, relating to the consolidated financial statements of Pioneer Bank, a Federal Savings Bank, and subsidiaries as of March 31, 1997 and for the nine-month period then ended, which appear in such amended Registration Statement. We also consent to the reference to us under the headings "Legal and Tax Opinions" and "Experts" contained in the Prospectus, which is a part of such amended Registration Statement. /s/Deloitte & Touche LLP DELOITTE & TOUCHE LLP Portland, Oregon August 6, 1997