Field Investigation of Success Factors of Fish Passageways in Oregon
channel, fish passage, habitat, life cycle, scour, slope, transportation
This paper discusses the results of a field investigation of 19 fish passage ways constructed by the Oregon Department of Transportation The Intent of these passageways is to avoid significant disruption to the habitats required for a healthy life cycle for fish and other aquatic organ isms The field investigation of physical factors that may correlate with successful passageways may provide insight into more reliable and sus tamable solutions to the problem of constructing highway crossings over natural waterways The investigation is part of a larger study of whether construction practices may be additional factors that result in success The researchers collected measurement information including slopes channel configurations crossing structure characteristics and streambed soil characteristics The sites were judged on the basis of their suitability as fish passageways for analytical purposes a success factor was created and used to rate each site on the basis of the field observations The physical metrics of the sites were correlated against the success index and other important fish passageway factors and the results are presented Important findings Include a relationship between downstream slope and scour as well as an assessment that subsurface flow may be related to factors perhaps construction techniques other than the configuration of the channel.
Transportation Research Record
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