Milltown Island, located at the mouth of the South Fork Skagit River, Skagit County, Washington was diked and maintained for farming from approximately the early 20th century until the late 1970s when flooding breached a perimeter levee system and washed out a local bridge providing access to the island. Until the initiation of the Milltown Restoration Project, the island sat fallow, yet impaired to the full hydraulic influence of tides, diminishing the value and quality of the island habitat to salmonids and other native species, in particular Chinook. The site was appealing for the project because historically it contained estuarine shrub habitat, which is rare in the Skagit delta and provides significant ecological functions to rearing juvenile salmon. The object of this project was to restore tidal/riverine processes and to scour and maintain the on-site tidal channels. To accomplish this goal, the project removed 335.4 meters of levee and constructed 1136.3 meters of channel from 2006 to 2007. Between 2006 and 2008 13,400 native plants were planted on the island in an effort to restore historic vegetative conditions. As a result of the project, natural tidal and river hydraulic/hydrologic connections have been restored to the project area. Channel formation within the project area has increased as the area has been subjected to the direct influence of river and tidal action. In addition, the project area is more freely connected to the river and bay, with tidal fluctuation influences. Furthermore, natural vegetation communities have established along the created channels and dike breaches.
Clifton-Cardoso, C., 2009. Milltown Restoration Project As-built Report. Skagit River System Cooperative, La Conner, WA. pp. 62.
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