Continuous water temperature data were collected at multiple sites along the Middle Fork and mainstem Willamette Rivers between Jasper and Newberg, Oregon, to support effectiveness monitoring for a large-scale channel and floodplain restoration program (Willamette Focused Investment Partnership, WFIP). Continuous water temperature loggers were deployed at a subset of WFIP restoration sites where river restoration activities were implemented to improve habitat conditions for native fish species. Data from water temperature monitoring will be used to evaluate the effectiveness of restoration activities at improving habitat conditions for Endangered Species Act (ESA)-listed salmonids and other native fish in the Willamette River. Additionally, water temperature monitoring in summer and early fall months at restoration sites is useful for determining whether thermal conditions at these sites are optimal, sub-optimal, or lethal for cold-water adapted fish species like spring Chinook salmon (Oncorhynchus tshawytscha). Water temperature monitoring for this study spans 2019 through 2022. Water temperature loggers were suspended in the water column on a wire between a concrete block and a buoy as part of a monitoring arrays installed at multiple off-channel location throughout the study area. This document describes data collected at the Minto-Brown Island Park monitoring site between 07/30/2020 and 10/19/2021 and associated data quality files. The monitoring site is within Willamette Slough, an alcove perennially connected to the Willamette River, and includes two monitoring arrays consisting of one water temperature logger suspended in the water column per array from 07/30/2020 to 05/14/2021 and one monitoring array consisting of two water temperature loggers suspended at different elevations in the water column from 05/14/2021 to 10/19/2021. These data and metadata have been added to the data release originally published in 2021.