Accession Number : ADA146512


Title :   Feasibility Study for Habitat Development Using Dredged Material at Jetty Island, Everett, Washington.


Descriptive Note : Final rept.


Corporate Author : CORPS OF ENGINEERS SEATTLE WA SEATTLE DISTRICT


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a146512.pdf


Report Date : Jul 1984


Pagination or Media Count : 80


Abstract : The feasibility of developing additional wildlife and fish habitat at Jetty Island, Everett, Washington, using dredged material was explored. Existing literature were reviewed and field surveys undertaken to define environmental conditions at the site and to determine constraints of developing habitat adjacent to the island. Terrestrial plant communities and intertidal habitats were characterized. Based on the analysis of field data and literature, the most suitable location for habitat development was found to be on unvegetated mudflats adjacent to the western shore of Jetty Island. Four alternative concepts (enclosed pond, spit/open lagoon, enclosed lagoon, islands) consisting of seven designs were evaluated. Of those seven designs, four were considered feasible based on such constraints as quantity of material available, tidal and current conditions, stability of substrate, location of dredging sites, and monetary considerations. The habitat types found to be most suitable for development were salt marsh and beach grassland. The preferred project design is an enclosed lagoon with tidal access via a channel from the protected eastern shore of the island. Approximately 24 acres of marsh community, 6 acres of beach grassland, and 5 acres of sand beach would be created. The project would primarily benefit juvenile fish (salmon, smelt, shiner perch, and Pacific Herring), waterfowl, shorebirds, and wading birds.


Descriptors :   *WASTE DISPOSAL , ENVIRONMENTS , MODIFICATION , FEASIBILITY STUDIES , ANIMALS , DREDGED MATERIALS , ISLANDS , ECOLOGY , PLANTS(BOTANY) , PUGET SOUND , WASHINGTON(STATE)


Subject Categories : Civil Engineering


Distribution Statement : APPROVED FOR PUBLIC RELEASE