South Fork Klaskanine River Dam Removal, Hatchery Diversion, and Salmon Habitat Restoration

HENDERSON environmental design-build professionals removed an existing concrete dam on the South Fork of the Klaskanine River to restore about 500 feet of active river channel and improve conditions for wild salmonid migration routes.  Additionally, HENDERSON’S design was required to provide reliable passive seasonal diversion to Clatsop County’s adjacent salmon hatchery.  HENDERSON’s work was integral to a larger effort at Clatsop County’s salmon hatchery within the Young’s Bay watershed located near Astoria.  The goal of this project in its entirety was to eliminate a concrete dam that prevented fish passage during low river flows and to improve the then-threatened runs of wild salmon and steelhead — and at the same time, continue to provide a diversion for existing hatchery operations.  HENDERSON’S work included rescue and removal of more than 200 juvenile Coho and Chinook salmon, cutthroat trout, Pacific lamprey and Pacific salamanders within the project reach; isolation and dewatering of the South Fork Klaskanine River to eliminate construction-related turbidity during in-water work; installation of large wood and root-wads, biodegradable erosion control fabric-wrapped native soil lifts, and more than 1,200CY of 3-foot and 4-foot boulders and river cobble.  HENDERSON’s South Fork Klaskanine Project was funded by a multi-faceted group of local, state, and federal stakeholders.

South Fork Klaskanine River Dam Removal, Hatchery Diversion, and Salmon Habitat Restoration

Website Design by BOING