DESCRIPTION
This project completed a feasibility study and preliminary design to breach and lower a levee along the left bank of the Puyallup River from approximately RM 9.6 to 10.5 at the confluence of the White River. The project considered a narrow range of alternatives within the study area and final recommendations were included in the 30% design report. Topography in the area allowed for a simpler, less-costly, easier, and nearly as effective alternative to a classic setback levee. The selected design is for breaches in the revetment to be constructed and material removed as needed to reconnect the river to over 17 acres of floodplain and allow natural channel and riparian processes to begin to create habitat in the newly opened area. A historic landfill will be removed from the site and a new side channel created in its place. In addition, the plan calls for the construction of several log structures to enhance fish habitat and direct flow and for relocation of a portion of the Riverwalk Trail. This project in intended to enhance habitat conditions for juvenile salmonids by creating off-channel habitats and increasing channel complexity. The project is expected to benefit Chinook, Chum, Pink, and Coho salmon and steelhead trout.
This particular site was identified by the Pierce County Levee Setback Evaluation done in 2008 for WRIA 10/12 (this location was identified as site number 4 of the 32 listed in the evaluation). This project ranked 19 out of the twenty proposed setback levees in the study.