Hydrology and Earth System Sciences
Hydrology and Earth System Sciences
HESS
Articles | Volume 27, issue 14
Articles | Volume 27, issue 14
https://doi.org/10.5194/hess-27-2807-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hess-27-2807-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 27, issue 14
Research article
 | 
28 Jul 2023
Research article |  | 28 Jul 2023

Warming of the Willamette River, 1850–present: the effects of climate change and river system alterations

Stefan A. Talke, David A. Jay, and Heida L. Diefenderfer

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Latest update: 10 Sep 2025
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Short summary
Archival measurements and a statistical model show that average water temperature in a major US West Coast river has increased by 1.8 °C since 1850, at a rate of 1.1 °C per century. The largest factor driving modeled changes are warming air temperatures (nearly 75 %). The remainder is primarily caused by depth increases and other modifications to the river system. Near-freezing conditions, common historically, no longer occur, and the number of warm water days has significantly increased.
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