May 18, 2010. /Lesprom Network/. Stimson Lumber Co., headquartered in Portland, Oregon, USA, will curtail 100% of stud production at five mills the week of May 31, as Random Lengths reported. Market conditions were cited. The mills involved are in Tillamook and Forest Grove, Oregon, and Priest River, Plummer, and St. Maries, Idaho. Stimson Lumber Company is a privately-held forest products and natural resource company. Stimson Lumber Company has assets and operations in four Western States: Idaho, Montana, Oregon, and Washington.