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Scappoose Bay Restoration Plan

09 029 1Client: Scappoose Bay Watershed Council

In 2000, the Scappoose Bay Watershed Council (SBWC) completed a watershed assessment for the streams and catchments that enter Scappoose Bay. The watershed assessment identified several areas of concern affecting watershed and ecosystem health. Of particular concern was the potential impact that incision has on channel and floodplain interaction and the ability of the stream to support and maintain good aquatic habitat. A 5 mile stretch of South Scappoose Creek that flows through the City of Scappoose was determined to have high priority for further assessment. It was identified as a priority for further assessment due to local concerns about erosion and flooding and the opportunities to enhance conditions for salmon and other organisms.

In 2008, SBWC contracted with Waterways to prepare an assessment of the 5 miles of South Scappoose Creek. The study identified the primary forces that led to the current degraded condition and recommended a comprehensive, long-term strategy to improve the physical habitat. Following completion of the restoration plan, Waterways has been assisting SBWC in obtaining grant funding to design and implement high priority projects.  To date, two of the projects have been designed and implemented. They include:

1) Snook Property Restoration: Approximately 3,000 cubic yards of material was removed from an eroding bank to create a bench, lower the bank angle, and revegetate the site. Eight engineered log structures were also installed.

2) Scappoose Confluence: This project is located at the confluence of North and South Scappoose Creek. Six engineered log structures were installed, two side channels were reactivated, and large wood was placed on the reconnected floodplain.  The ultimate goal was to restore function to this tributary alluvial fan and reduce the impacts associated with channel incision.

Waterways conducted all aspects of planning and restoration design for these projects including geomorphology, hydrology, GIS, surveying, restoration design, permitting, construction supervision, and as-built drawings. Our contract totaled approximately $160K for these three projects. The projects were constructed in summer 2011 and will be monitoring by SBWC to evaluate success.

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