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Shoreline City Hall
17500 Midvale Ave N
Shoreline, WA 98133
Completed July 2015
Phase: Plant Establishment
Construction of the biorevetment structure and other major structural work was complete as of July 20, 2015. Plantings were completed in December 2015. The project is now in a 5-year plant establishment period, as required by City and U.S. Army Corps of Engineers permits, to be completed at the end of 2020.
The completed project, looking downstream
Overview & HistoryPrior to the City’s incorporation, King County installed a dam structure on McAleer Creek downstream from the project location at NE 196th Street. The dam allowed for in-stream flow detention to alleviate downstream flooding within Lake Forest Park. As a condition of the installation, the County obtained a drainage easement and agree to maintain the stream embankment upstream from the dam. The maintenance responsibility was transferred to the City as part of the incorporation.
To uphold the conditions of the City's drainage easement, the City is required to maintain the revetment upstream of the dam to ensure a stable stream bank along private property (a revetment is a sloping structure placed on banks or cliffs of streams in such a way as to absorb the energy of incoming water).
The existing revetment provides a low level of bank protection for the majority of the stream
bank along the private property adjacent to McAleer Creek, which has exhibited an eroding cutbank condition for approximately 60 feet of its length. Many of the rocks that comprise the revetment have been dislodged from their original positions and are no longer functioning to prevent erosion of the bank. This project will repair the erosion of the embankment.
This project will also take the opportunity to enhance stream habitat by creating friendly fish areas along the creek and adding shade trees to help maintain a cooler water temperature.