0 Occurrences 5 Occurrences 34 Occurrences 63 Occurrences 
Lower Green Right Bank Location
City, County, and State of the levee system. Determined by the levee alignment location not the leveed area.
Kent, King County, Washington
System ID
Unique identifier code for the levee system using 10 or 12 numbers in length.
5505000043
Operation and Maintenance Organization
Entity responsible for day-to-day management of the levee.
King CountyKing CountyKing CountyKing CountyKing CountyKing CountyKing County
Floodplain Management
Entities responsible for regulating activities that occur in areas prone to flooding.
FEMA Region 10
Last Assesment Date Last Risk Assessment or Formal Inspection.
8/14/2020
Data Last Updated Date any of this information for the system has been updated.
10/15/2024
Levee Length
Combine length of all the levee system features including the embankments, floodwalls, closures where they exist for this system.
8.499 Miles Average Levee Height
The average height of the levee system. The levee profile viewer on the mapping window will show the actual levee height values for the length of the levee if available.
6 Feet Year Levee Constructed Year levee system was fully completed as a flood reduction project.
1990 Summary
General text description of the levee system with a summary of why the levee is there, and the benefits it provides.
The Lower Green Right Bank Levee system is a non-federally constructed, operated, and maintained system located on the Right bank of the Green River near Tukwila, King County, WA. It consists of eight levee segments that extend from river mile 14.5 to 23.2. From downstream to upstream they are: Desimone, Boeing, Lower Russell Road Holliday Kennel, Upper Russell Road Somes Dolan, Kent Shops – Narita, and Meyer’s Golf, Signature Pointe, and WValley Highway NPS that tie together to create a continuous system. The levee system was constructed in the 1960s by the local sponsor King County to provide flood risk reduction to roughly 8 square miles of retail businesses, manufacturing, public infrastructure, agricultural property with some farm and residential structures. It also protects critical infrastructure including: 1 airport, 10 chemical industries, 1 college, 1 EMS, 1 electric substation, 2 fire stations, 1 hazmat location, 2 oil gas facilities, 7 oil gas pipelines, and 2 schools. The local sponsor of record responsible for operations and maintenance of the levee system is King County. The local communities are generally aware of flood risk and evacuation routes appear to be effective.
Performance & Condition
General text description of the historical and anticipated performance of the levee, the people and property benefitting from the levee and who may be at risk of flooding, and actions to address areas of concern.
The Corps of Engineers performed a screening level risk assessment on the Lower Green River Right Bank Levee System in 2015. The risk was determined to be moderate for this levee system based on a combination of the flood hazard frequency, the anticipated levee performance, and the potential consequences. A 175-year return period level of protection has been estimated for this levee system based on the lowest segment. If inundation were to occur, approximately $1.2 Billion in property damages would accrue with 2908 structures affected. Loss of life is expected to be Moderate. King County is currently participating the USACE System-Wide Improvement Framework (SWIF) program to make improvements to the system while remaining eligible under PL 84-99.
Flooding Hazard
Historic Loading by Percentage of Height
Representative loading associated with historical flood information as a percentage of the levee height or overtopping.
Representative loading associated with historical flood information as a percentage of the levee height or overtopping.
0 Occurrences 5 Occurrences 34 Occurrences 63 Occurrences