X0202 4 2005-12-02 0000079716 POTLATCH CORP PCH 0001180473 QUESNEL GREGORY L 601 W. RIVERSIDE AVE. SUITE 1100 SPOKANE WA 99201 1 0 0 0 Phantom Stock Units 49.64 2005-12-02 4 A 0 604.35 49.64 A Common Stock 604.35 1202.84 D Phantom stock units are credited to the reporting person's account on the transaction date in accordance with the provisions of the Potlatch Corporation Deferred Compensation Plan for Directors and will be converted to cash and paid on a 1-for-1 basis with the issuer's common stock. The phantom stock units acquired represent an equity compensation award approved by the Potlatch Corporation Board of Directors and granted to the reporting person. The number of phantom stock units was determined by dividing the closing price of the issuer's common stock on the transaction date into the reporting person's award amount. The phantom stock units become payable in cash upon the reporting person's termination of service as a Director of Potlatch Corporation. Malcolm A. Ryerse, Attorney-in-Fact 2005-12-05