0001338749-06-000027 4 1 20060228 20060301 20060301 POTLATCH CORP 0001338749 6798 820156045 DE 1231 601 WEST RIVERSIDE AVENUE SUITE 1100 SPOKANE WA 99201 (509) 835-1500 601 WEST RIVERSIDE AVENUE SUITE 1100 SPOKANE WA 99201 Potlatch Holdings, Inc. 20050914 WEYERHAEUSER WILLIAM T 0001056916 4 34 001-32729 06654944 P O BOX 1278 TACOMA WA 98401 2532728336 PO BOX 1278 TACOMA WA 98401 4 1 edgar.xml PRIMARY DOCUMENT