This data release contains a dataset of continuous in-situ water temperature records from multiple federal, state, local agencies, non-profit organizations, and private industry partners across 788 locations within the Willamette River Basin (WRB) from years 2011 to 2024. This dataset complements and extends the existing multi-agency NorWeST water temperature dataset for the Willamette River Basin which includes records through 2011, by adding new sites and expanding the period of interest through 2024. This work was conducted as part of the U.S. Geological Survey (USGS) Next Generation Water Observation System (NGWOS) and Integrated Water Availability Assessments (IWAAs) projects to characterize spatial and temporal patterns in water temperature and support trends and modeling assessments by IWAAs. The data will also inform site selection in future multi-agency efforts to fill in monitoring gaps and reduce redundancy. This data release includes three files. The first (Willamette_WT_Unit_Values.csv) is a dataset of continuous water temperature data in csv format where data from multiple sources were merged into a single dataset. The second file is a zip file containing a shapefile of all locations with continuous water temperature data contained in this data release (Willamette_WT_Sites.zip). The third file (Willamette_WT_Sites.csv) contains a csv file listing the locations of each water temperature record contained in this data release.