We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (Nos. 333-20165, 333-20167, 333-89949, 333-64083 and 333-68176) of Northwest Pipe Company of our report dated March 11, 2005 relating to the consolidated financial statements, financial statement schedule, management’s assessment of the effectiveness of internal control over financial reporting and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.