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    Restoration and maintenance of passage for aquatic organisms at road-stream crossings represents a major management priority, involving an investment of hundreds of millions of dollars. This report has been written, in part, for field biologists who will be undertaking and evaluating the effectiveness of aquatic organism passage restoration projects at road-stream crossings. The report outlines basic methods for evaluating road-stream crossing passage impairment and restoration and discusses under what circumstances and conditions each method will be useful; what questions each method can potentially answer; how to design and implement an evaluation study; and points out the fundamental reality that most evaluation projects will require special funding and partnerships among researchers and resource managers.

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    Hoffman, Robert L.; Dunham, Jason B.; Hansen, Bruce P., eds. 2012. Aquatic organism passage at road-stream crossings—synthesis and guidelines for effectiveness monitoring. U.S. Geological Survey Open-File Report 2012-1090. 64 p.


    culverts, fish, amphibians, streams

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