American Society of Civil Engineers

Monitoring Results for a Shoreline Stabilization Project Willapa Bay, Washington

by N. Sultan, (Coastal Engineer, Pacific International Engineering, PLLC, P.O. Box 1599, Edmonds, Washington)
Section: Shoreline Protection—Case Studies, pp. 708-719, (doi:

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Document type: Conference Proceeding Paper
Part of: Solutions to Coastal Disasters ’02
Abstract: The SR-105 Emergency Stabilization Project was constructed in the summer of 1998 to protect a stretch of state highway from destruction because of shore erosion. The project consists of a rock groin and dike structure and beach nourishment. A recently concluded monitoring program has shown that the project has performed to design expectations. The project has the added benefit of reducing beach erosion along an extremely erosive shoreline northwest of the project site. The project, specifically the underwater dike, has induced relocation of a deep tidal channel approximately 500 to 2,000 feet further from the shoreline, resulting in favorable conditions for the recovery of the shoreline. Scour has developed at the toe of the underwater dike that may endanger the stability of part of the structure and the performance of the project. Alternative actions to prevent scour and reduce risk to the structure were developed and are presented below. Also, the project resulted in the development of approximately 16 acres of shallow water habitat. Approximately 15 acres of this habitat are protected from waves and are likely the most environmentally valuable habitat in the area.

ASCE Subject Headings:
Coastal management
Groins (structure)
Seismic effects