Henderson Land Services LLC

Description

HENDERSON provided environmental construction services to the South Scappoose Bay Watershed Council for restoration of the confluence of the South and North Forks of Scappoose Creek. HLS worked closely with Council staff, their design engineer, and local property landowners to value-engineer site restoration design. The confluence of these creeks represent vital salmonid habitat having experienced severe erosion and channel migration for more than a decade. Several engineered log jams were installed by HENDERSON field ecologists to prevent further bank erosion. Near-vertical stream banks were re-graded to a more sustainable 3:1 repose. Scappoose Creek’s historic high flow channel was enhanced with logs and rootwads and re-connected to the base-flow stream channel to provide greater frequency of high flow access to the historic floodplain. Scappoose Creek’s important confluence habitat now has enhanced channel roughness, increased in-water habitat diversity, more-frequent access to the historic floodplain, and enhanced off-channel floodplain refuge.

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 is a highly experienced design-build firm offering professional environmental services in assessment, design, and construction. We believe that long term solutions to complex environmental problems can be achieved through precise assessment of existing conditions, multi-disciplinary design, value-engineering, and field implementable solutions. Henderson prides itself on providing comprehensive environmental services which enables us to work closely with our clients on innovative, effective, and practical natural resource solutions. Our progressive designs and established construction projects have earned Henderson a regional reputation as a leader in the habitat restoration industry.

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