Rising costs and weak market conditions have forced Stimson Lumber Company to curtail operations at its Clatskanie and Forest Grove, Oregon, mills. The company cited rising costs in many areas from labor, raw materials, packaging, fuel, and energy as weighing heavily on the ability to maintain an effective, safe, and healthy production environment. Stimson plans to curtail production by 30% immediately.    Stimson Lumber Company stretches across Oregon, Idaho and Montana and operates seven mills in Oregon and Idaho; and owns over 500,000 acres of forest land in the western United States ...