The plan was developed by seeking out and incorporating the diverse perspectives of our community. This plan also reflects a broader range of flooding types than King County’s past flood plans. In addition to mainstem rivers, new areas of emphasis include coastal flood hazards and sea level rise, small stream flooding, and urban flooding.

By proposing new policies and many different projects and programs, the 2024 Flood Plan intends to reduce risk to people and property from flooding and channel migration while also supporting resilient communities and ecosystems. The plan will guide King County's work, set county policy for floodplain management, and will help to guide county investments that reduce flood risk and deliver multiple community benefits. The plan meets federal requirements for the National Flood Insurance Program, and it’s hoped that other local governments look to this plan as a resource as they implement their own flood risk reduction activities.

Links and Resources

2024 King County Flood Management Plan

Acknowledgments, Executive Summary, Table of Contents

Chapter 1, Introduction

Chapter 2, Flooding in King County

Chapter 3, Review of Flood Risk Reduction Activities

Chapter 4, Comprehensive Risk Mitigation Strategy and Action Plan

Chapter 5, Plan Implementation

Chapter 6, References and Source Material

2024 King County Flood Management Plan Appendices

 State Environmental Policy Act (SEPA)

2024 King County Flood Management Plan SEPA Final Programmatic Environmental Impact Statement

Partner Planning Committee

The Partner Planning Committee helped shape the flood plan through in-depth discussions at 10 meetings over 16 months. 

Partner Planning Committee information

Past flood plans

The most recent flood plan was completed in 2006 and adopted by King County Council in January 2007. The flood plan was last updated in 2013 and adopted by King County Council with the passage of Ordinance No. 2013-0419.

Download the 2006 flood plan and 2013 flood plan update. These reports are provided in Adobe Acrobat .pdf format.

2006 King County Flood Hazard Management Plan (16.6 MB)

2013 King County Flood Hazard Management Plan Update and Progress Report (4 MB)

Printed copies of the 2006 flood plan, 2013 flood plan update are available, and the 2024 flood plan will be available at the following King County libraries:

• Auburn Library
• Bellevue Regional Library
• Bothell Regional Library
• Carnation Library
• Duvall Library
• Fairwood Library
• Fall City Library
• Issaquah Library
• Kent Library
• Maple Valley Library
• Muckleshoot Library
• North Bend Library
• Redmond Regional Library
• Skykomish Library
• Snoqualmie Library
• Tukwila Library