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Screening Tools for Identifying Migrating Stream Channels in Western Washington: Geospatial Data Lay

Publication number Date Published
15-06-003February 2015
VIEW NOW Screening Tools for Identifying Migrating Stream Channels in Western Washington: Geospatial Data Lay (Number of pages: 40) (Publication Size: 2800KB)

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Author(s) Nicholas T. Legg and Patricia L. Olson
Description This document describes two screening tools (developed at Ecology) for quickly assessing channel migration potential. The first tool is a GIS data layer called the Channel Migration Potential (CHAMP) layer, which contains a classification of channel migration potential for stream networks of Western Washington. The second component describes channel characteristics visible in aerial imagery that indicate active channel migration. Visual assessment of channels helps refine the initial broad-scale assessments of channel migration potential using the CHAMP data layer. Together, these tools help plan and prioritize floodplain management actions such as Channel Migration Zone mapping, erosion risk reduction, and floodplain restoration.
NOTES A zip file containing the CHAMP data layer is included as an attachment. The layer can also be downloaded from the Ecology GIS data page:
The mission of the Department of Ecology is to protect, preserve, and enhance Washington’s environment. To help us meet that goal, please consider the environment before you print or request a copy.

ADA Accessibility
The Department of Ecology is committed to providing people with disabilities access to information and services by meeting or exceeding the requirements of the Americans with Disabilities Act (ADA), Section 504 and 508 of the Rehabilitation Act, and Washington State Policy #188.
Visit Ecology’s website for more information.
Contact Patricia L. Olson or SEA Program Hydrogeologist at 360-407-6966 or
Keywords hazards, floodplains, channel migration zones, floods, GIS, Channel Migration, streams, shoreline management
WEB PAGE Ecology GIS data webpage

A Methodology for Delineating Planning-Level Channel Migration Zones

Channel Migration Processes and Patterns in Western Washington: A Synthesis for Floodplain Management and Restoration

A Framework for Delineating Channel Migration Zones