POTLATCH CORPORATION Subsidiaries The following subsidiaries are included in the company's consolidated financial statements. State in Which Percentage of Voting Securities Name Organized Owned Duluth & Northeastern Railroad Co. Minnesota 100 Cloquet, Minn. Prescott & Northwestern Railroad Co. Arkansas 100 Prescott, Ark. St. Maries River Railroad Co. Idaho 100 Lewiston, Idaho Warren & Saline River Railroad Co. Arkansas 100 Warren, Ark. All unnamed subsidiaries, when considered in the aggregate as a single subsidiary, would not constitute a significant subsidiary. No separate financial statements are filed for any sudsidiary. Exhibit (22)