Water temperature data to support effectiveness monitoring of channel and floodplain restoration projects along the Willamette River, Oregon: Willamette Confluence Preserve 2019-2021

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 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). 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 Willamette Confluence Preserve Mile Long pond monitoring site between 06/27/2019 and 03/22/2021. The monitoring site is within a former gravel pit adjacent to the Middle Fork Willamette River and includes two monitoring arrays consisting of three water-temperature loggers suspended in the water column from 06/27/2019 to 08/06/2020 and one monitoring array with one logger from 11/09/2020 to 03/22/2021.

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