The potential impacts of erosion control structures on habitat, particularly in regard to salmon and other threatened species, is of concern to the Washington State Department of Transportation. Rock armor used to control erosion, protect property, or redirect flows modifies habitat in ways that are as yet unquantified. This letter report documents the methods used and the results obtained from a field data collection program at Washaway Beach that was aimed at studying habitat characteristics and species location and abundance at the groin and dike and comparing it to a nearby control site. This is the first in a proposed series of studies that will document the habitat and occurrence of migrating salmonids through the spring out-migration of juveniles and the fall return of adults.
Pacific Northwest National Laboratory (U.S.)
Animal migrations, Beaches, Behavior, Data collection, Dikes, Environmental impacts, Erosion control, Estuaries, Field studies, Fishes, Groins (Hydraulics), Habitat (Ecology), Monitoring, Salmon, Shore protection.