Pacific salmon and steelhead once contributed large amounts of marine-derived carbon, nitrogen and phosphorus to freshwater ecosystems in the Pacific Northwest. These nutrients are no longer available in the historic quantities because fewer adult fish are returning to spawn (and die). To compensate for reduced nutrient load and resultant lowered stream productivity, recent mitigation efforts have focused on addition of nutrients to freshwater systems (Columbia River Hatchery Reform Project, Appendix A). Consistent with the Upper Columbia Salmon Recovery Plan (filling this data gap is a Tier 1 priority), the objective of this project is to determine the need for, and extent of, conducting nutrient enhancement in high priority tributaries in the Wenatchee basin. Our goal is to evaluate baseline conditions (water quality, periphyton, marcroinvertebrates), establish goals or budgets for these indicators, develop a treatment and monitoring plan, and secure approval from Department of Ecology (DOE) for a pilot nutrient enhancement program in the Upper Wenatchee. State water quality standards are designed to protect salmonids. This scientifically established opinion has been promulgated in an agreement between DOE, US EPA, and regional stakeholders as a Total Maximum Daily Load (TMDL) that limits additional phosphorus loads to specific areas in the Wenatchee basin.