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King County applied for and received all permits related to summer 2012 construction, which focused on right bank repairs. Right bank construction was completed in September 2012 to provide a stable setback levee and remove remnant rocks from the channel. Planting work was completed in the fall and winter of 2013.

Project update

The Cedar Rapids reach has continued to evolve subsequent to the 2010 construction of the engineered log jams (ELJs) and the 2012 construction of the right bank setback levee. Since then, King County has been actively monitoring the site to identify needs for adaptive management or facility repairs. One such repair will occur in summer 2017, when King County will construct a maintenance repair of one of the ELJs (ELJ 6), as noted in the aerial photograph below.

Cedar_Rivers_ELJ_repair

Project overview

The Cedar Rapids Levee Setback Repair Project planned repairs to the existing Cedar Rapids setback levees along both the left and right banks of the Cedar River. Since the Riverbend Mobile Home Park was purchased by King County in 2013, the repair of the left bank revetment was deemed unnecessary.

cedar_rapids_project_area

The project is located within the Cedar Rapids Natural Area on the Cedar River between river mile 7.2 and 7.4. The levee setback modification along the left bank was designed between river mile 7.2 and 7.4, and the revetment setback project on the right bank was completed at river mile 7.25. These river locations roughly correspond to the 17600 block of State Route 169 (Maple Valley Highway) on the left bank and Southeast Jones Road on the right bank.

A buried rock toe was designed and permitted along the riverward face of the left (south) bank but was not constructed. This area will be monitored during floods to determine if emergency actions are required.

On the right (north) bank, a short segment of the upstream end of the Brassfield Revetment was set back and will tie into the Cedar Rapids Setback Levee. Large angular rock placed in the channel during a 2011 emergency project was incorporated into the new facility. Native trees and shrubs were planted to restore the areas impacted by this project.

cedar_rapids_levee_repair_2012_diagram

Project goals

  • Flood damage reduction:
    • home buyouts to remove from harm's way
    • increase flood capacity of the reach
    • continue flood protection of adjacent properties
  • Salmon recovery through habitat improvements
  • Design that addresses recreational uses
  • 2012 goals to repair existing levee to provide adequate erosion protection

Project timeline

Benchmark Date
30% design and environmental review December 2011
Design and permitting Winter/early spring 2012
Right bank construction Completed summer 2012
Install native plants Completed fall/winter 2013

Project documents

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For more information about the Cedar Rapids Levee Setback Repair project, please contact John Engel, Supervising Engineer, Cedar River Basin, of the King County River and Floodplain Management Section.