Tryon Creek Confluence Salmon Habitat Restoration

Tryon Creek Confluence Salmon Habitat RestorationThe Tryon Creek confluence is an important habitat area as one of the major tributaries of the Willamette River within the Portland metropolitan area.  Historically, these tributaries provided important functional habitat for all life stages of migrating salmonids and other species within the Willamette River watershed.  HENDERSON environmental design professionals worked within a design team managed by the City of Portland Bureau of Environmental Services to design and assist in the permitting of a floodplain/riparian habitat enhancement effort for a 900-foot reach of Tryon Creek at the Willamette River confluence.  Tryon Creek is physically-constrained geologically and by land-use development, but has great restoration potential for enhancing salmon, steelhead, and lamprey habitat within the local watershed.  Design to enhance the confluence habitat integrated creation of a narrow floodplain bench, constructing a backwater/floodplain cove for refuge, and installing large wood structures along the channel and next to the mouth of Tryon Creek.  HENDERSON professionals worked within the design team contribute value-engineering services, materials salvaging, and proposed construction dewatering and sequencing plans.  HENDERSON also developed construction cost estimate(s) throughout design development and oversaw the final plans and specifications production.  Final design included floodplain regrading, stream channel habitat improvements including stream bed boulder enhancements, engineered large woody debris structures, floodplain roughness log installations, and log structure installations along the beaches of the Tryon Creek/Willamette River confluence.

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