DESCRIPTION
This large-scale restoration project will restore approximately 112 acres of Lower Dungeness River floodplain by setting back the Army Corps of Engineers east bank levee (R.M. 1-2.7) in its new location. The goal is to reconnect the Dungeness River with its historic floodplain, improve habitat conditions and restore riverine processes and functions. This phase will complete a preliminary design and perrmitting for the construction phase. Constructed by the Corps in 1963, the current levee constrains the river channel, resulting in increased channel confinement, bedload aggradation, instability, and water quality impacts that are a factor in the current local shellfish closures. Dikes on both sides of the Dungeness have disconnected the river from its floodplain and disrupted river processes which prohibits flood waters from dissipating and inhibits the river's natural ability to store excess sediment outside the channel. Levee setback and channel restoration in this reach provides floodplain and side channel habitat critically-needed by salmon for spawning, rearing and migration.
Clallam County completed 65% project designs for this large-scale restoration project to restore approximately 112 acres of Lower Dungeness River floodplain. The future restoration project includes setting back the Army Corps of Engineers east bank levee (R.M. 1-2.7) to its new location. The goal is to reconnect the Dungeness River with its historic floodplain, improve habitat conditions and restore riverine processes and functions. This phase completed preliminary design and initiated permitting for the construction phase. An engineering and design team was selected to design to US Army Corps of Engineers specifications. Community outreach included one-on-one and community meetings, maintenance of a web page, and periodic email newsletter/updates.
Constructed by the Corps in 1963, the current levee constrains the river channel, resulting in increased channel confinement, bedload aggradation, instability, and water quality impacts that are a factor in the current local shellfish closures. Dikes on both sides of the Dungeness have disconnected the river from its floodplain and disrupted river processes which prohibits flood waters from dissipating and inhibits the river's natural ability to store excess sediment outside the channel. Levee setback and channel restoration in this reach provides floodplain and side channel habitat critically-needed by salmon for spawning, rearing and migration.
Riparian and instream habitat will also be restored. Priority species supported by these habitats are ESA- listed Puget Sound Chinook, Eastern Strait of Juan de Fuca Summer Chum, Coastal-Puget Sound Bull Trout, and Puget Sound Steelhead. The project benefits all migratory salmon listed above as well as coho, pink salmon and coastal cutthroat, by restoring the ecological processes of the lower Dungeness River. This project is a high priority in both the Puget Sound Chinook Recovery Plan and the North Olympic Lead Entity for Salmon's 3-year workplan.