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As part of its Habitat Conservation Plan, the Pacific Lumber Company is evaluating the effects of its management activities on the water quality parameters of the streams within its 225,000-acre ownership. Our Science Staff, in conjunction with U.S. Forest Service researchers, have developed procedures for estimating the amount of sediment delivered to watercourses from past, present, and future timber harvest operations. These analyses are conducted at the watershed-scale (approximately 15,000 to 20,000 acres) using Watershed Analysis procedures developed for the Washington State Department of Natural Resources. The evaluation tool we designed allows resource managers to compare the effects of varying levels of disturbance (e.g., silvicultural intensity, harvesting method, and site preparation method) so that they can develop appropriate management plans and, site-specific mitigation measures to minimize or completely offset the detrimental impacts.