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Posted on: April 29, 2021

King County to Conduct Levee Breach Study of South Fork Snoqualmie River, May - August

SF Snoq River Levee

King County will soon begin fieldwork related to a Levee Breach Study of the South Fork Snoqualmie River in North Bend. 

This fieldwork will help identify areas that are vulnerable to breaching, which occurs when part of a levee gives way suddenly or gradually, creating an opening for floodwaters to flow. When levees breach, fast-flowing water can quickly flood large areas behind them, causing significant damage.

The levee system of the South Fork Snoqualmie River consists of 11 levees – totaling 6.25 miles – that are adjacent to the river where it runs through the North Bend area. This levee system provides critical flooding protection to the City. 

North Bend area levee inspections, surveying and testing will occur May through August 2021. Findings from the South Fork Snoqualmie River Levee Breach Study will be shared with residents when the study is completed in March 2022.

Based on study results, King County may perform repairs, capital improvement projects and/or monitoring and emergency planning of the South Fork levee system.

The King County River and Floodplain Management Section (RFMS) is overseeing the Levee Breach Analysis on behalf of the King County Flood Control District. 

For more information visit or contact Judi Radloff, Project Manager, Water and Land Resources Division 206-263-6844 or

Levee Breach Study Area

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