Old-growth forests provide an important resource in terms of both timber and non-timber values. Northwest Oregon represents an area where this resource is scarce and options for preserving old-growth habitat are limited. This study identifies the old-growth resource on public lands within the area, suggests a range of preservation alternatives for remaining old-growth stands, and assesses the effects of these alternatives on harvest levels, present net values, payments to counties, and the forest products industry. Alternatives range from setting aside a distribution of old-growth tracts to preserving all remaining old growth. Acreages withdrawn vary from 3,027 to 21,627 acres. Harvest scheduling and economic effects of these alternatives vary over time. In the short term, harvest levels drop by a greater percentage than the percentage of the land base withdrawn. Alternative harvest schedules represent present net value opportunity costs of 16 to 74 million dollars.