Technical Report


Tide gates : operation, fish passage and recommendations for their upgrade or removal Public Deposited

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  • This document is intended for policymakers so they can make informed decisions about upgrading or removing tide gates in an effort to improve conditions for Oregon’s native migratory fish and other animals and plants that inhabit estuaries. It has two main sections: The first includes an overview of the technical aspects of tide gates, including non-traditional ones. The second contains findings from a review of scientific literature about upgrading or removing tide gates as well as conclusions from a review of estuary restoration projects involving tide gates. Based on those findings, we’re also including recommendations to guide future investments in, and monitoring of, restoration projects associated with tide gates.
  • This document summarizes parts of a 140-page publication, Ecological Effects of Tide Gate Upgrade or Removal: A Literature Review and Knowledge Synthesis, that the Oregon Watershed Enhancement Board (OWEB) funded through a 2016 grant to a team at Oregon State University. That report aimed to help readers understand how tide gates affect water quality and fish. It also sought to help OWEB understand the effectiveness of its investments in estuary habitat restoration projects involving tide gates so it can target future investments. For more information on types of tide gates and their environmental effects, see Oregon Sea Grant’s publications Tide Gates in the Pacific Northwest and The Effects of Tide Gates on Estuarine Habitats and Migratory Fish.
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  • Souder, J. and G. Giannico. 2020. Tide Gates: Operation, Fish Passage and Recommendations for Their Upgrade or Removal. ORESU-T-20-001. Oregon Sea Grant, Corvallis, OR. 15 pp.
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  • This report was prepared by Oregon Sea Grant under award number NA18OAR4170072 (project number M/A-21) from the National Oceanic and Atmospheric Administration’s National Sea Grant College Program, U.S. Department of Commerce, and by appropriations made by the Oregon State Legislature



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