DESCRIPTION
King County proposes to complete final designs to open up habitat behind the McElhoe Pearson Levee on the Snoqualmie River near Carnation WA, by breaching the levee and placing setback protection along the road. The levee and revetment confine the mainstem channel and prevent the river from accessing its floodplain. This project will restore up to 2.26 acres of aquatic off-channel habitat and up to 4,200 lineal feet of off-channel and mainstem edge habitat along the mainstem Snoqualmie River. The McElhoe Pearson Levee is located along the right bank of the Snoqualmie R at river mile 22, just upstream of the Carnation Farms Rd Bridge. The property is owned by King County and used for passive recreation. The project site is located within and immediately adjacent to the east bank of the active Snoqualmie R channel. Since the construction of the levee in 1960, the area behind the levee has been protected from significant fluvial changes and subsequent habitat forming processes. The area behind the levee contains several depressional areas and is comprised of an early to mid seral stage mixed deciduous/coniferous forest. The goal of this project is to restore natural floodplain inundation and channel migration processes along the Snoqualmie R, thereby restoring habitat conditions for numerous native salmonids. This project targets restoring habitat for ESA-listed Chinook salmon and will also improve habitat for other salmonids found in the Snoqualmie including coho, chum, and pin
King County completed final designs to breach the McElhoe Pearson levee to provide salmonid access to floodplain habitat behind the levee. The design included the placement of setback protection along 310th Ave NE. This backwater project restored approximately 1648 lineal feet of off channel edge habitat and 1.57 acres off-channel habitat of the Snoqualmie River (PRISM Attachment 23: Table 2).
The McElhoe Pearson Levee is located near the City of Carnation, along the right bank of the Snoqualmie R at river mile 22. Since levee construction in 1960, the mainstem channel has been confined and disconnected from its floodplain, preventing significant fluvial changes and subsequent habitat forming processes. The area behind the levee contains several depressional areas and is comprised of an early to mid seral stage mixed deciduous/coniferous forest.
The goal of this project is to provide connectivity between the river and the floodplain area behind the McElhoe Pearson levee and provide rearing and flood refuge habitat for juvenile Chinook and other salmonids. This project targets restoring habitat for ESA-listed Chinook salmon and will also improve habitat for other salmonids found in the Snoqualmie including coho, chum, and pink salmon and steelhead and cutthroat trout. This project was constructed in August 2012 and the Snoqualmie now has access to the backwater habitat behind the levee.