During 2018 and 2019 EAS, under subcontract with Normandeau Associates, provided monitoring and evaluation services for the U.S Army Corps of Engineers, Portland District, NWP Hatchery Program related to the mitigation production and release of spring Chinook salmon into the Willamette Basin. EAS developed a study plan to successfully complete chinook salmon carcass collections and redd counts during both seasons, including regular surveys of more than 360 river kilometers in tributaries of the Willamette River including the Santiam, North Santiam, South Santiam, Middle Fork Willamette, Fall Creek, McKenzie, South Fork McKenzie, Horse Creek, and Lost Creek. Surveys were conducted by foot and from specialized rafts to determine abundance and distribution of hatchery and natural-origin adult Chinook salmon carcasses and the number and distribution of redds. Our staff analyzed data sets and compiled the results into publicly available reports. In addition, we presented at the Willamette Fisheries Science Review to regulators and stakeholders in the Willamette Basin.