Abstract Title

Session S-02G: Reimagining Shorelines

Proposed Abstract Title

Shannon Point Revetment Removal Feasibility and Restoration Alternatives

Presenter/Author Information

Stephanie WilliamsFollow

Keywords

Shorelines

Location

Room 6C

Start Date

1-5-2014 5:00 PM

End Date

1-5-2014 6:30 PM

Description

Coastal Geologic Services assessed the feasibility of removing nearly 800 ft of large boulder rock and fill from the intertidal. The rock revetment was an apparent abandoned railroad causeway cut from bedrock and filled along the intertidal portion of a bluff backed beach just south of Shannon Point in Anacortes, Skagit County, Washington. This restoration project was previously identified in a restoration prioritization report by CGS (2008) as a high priority for habitat benefit, but removing approximately 2,500 cubic yards of boulder and fill from the beach presents many challenges. Several issues needed to be considered and flushed out if this project was to proceed smoothly. These issues included, variable ownership within and surrounding the project area, balancing full restoration goals of project proponents with cost effectiveness and future trail options for Parks, and foreseeable permitting requirements such as method of removal – over land or by barge, the nature of a small wetland area confined between the base of the bluff and the rock revetment, and slope stability. The range of issues to investigate and address here are representative of the challenges associated with nearshore restoration feasibility projects throughout the Salish Sea. Background data investigation and site assessment determined the feasibility of removal actions and informed restoration alternatives. Site access was secured by the project proponents. Site assessment included several visits to the site for reconnaissance, topographic survey and rock quantities estimate, and detailed slope stability assessment. Three restoration alternatives were produced including: 1. Full Restoration entailing removal of all revetment rock and fill, 2. Full Rock Revetment Removal, and 3. Partial Rock Revetment Removal. Maneuvering through challenges presented in the feasibility stage of the project to the recommended restoration alternative and design (currently in process) for Shannon Point will be the focus of this presentation.

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May 1st, 5:00 PM May 1st, 6:30 PM

Shannon Point Revetment Removal Feasibility and Restoration Alternatives

Room 6C

Coastal Geologic Services assessed the feasibility of removing nearly 800 ft of large boulder rock and fill from the intertidal. The rock revetment was an apparent abandoned railroad causeway cut from bedrock and filled along the intertidal portion of a bluff backed beach just south of Shannon Point in Anacortes, Skagit County, Washington. This restoration project was previously identified in a restoration prioritization report by CGS (2008) as a high priority for habitat benefit, but removing approximately 2,500 cubic yards of boulder and fill from the beach presents many challenges. Several issues needed to be considered and flushed out if this project was to proceed smoothly. These issues included, variable ownership within and surrounding the project area, balancing full restoration goals of project proponents with cost effectiveness and future trail options for Parks, and foreseeable permitting requirements such as method of removal – over land or by barge, the nature of a small wetland area confined between the base of the bluff and the rock revetment, and slope stability. The range of issues to investigate and address here are representative of the challenges associated with nearshore restoration feasibility projects throughout the Salish Sea. Background data investigation and site assessment determined the feasibility of removal actions and informed restoration alternatives. Site access was secured by the project proponents. Site assessment included several visits to the site for reconnaissance, topographic survey and rock quantities estimate, and detailed slope stability assessment. Three restoration alternatives were produced including: 1. Full Restoration entailing removal of all revetment rock and fill, 2. Full Rock Revetment Removal, and 3. Partial Rock Revetment Removal. Maneuvering through challenges presented in the feasibility stage of the project to the recommended restoration alternative and design (currently in process) for Shannon Point will be the focus of this presentation.