Technical info

Please take this time to thoroughly navigate our resources below to learn about the current zoning regulations, river conditions, methodology, and more.


The county’s project team, including technical consultant GeoEngineers, will gather physical and historical data. This data will be augmented with local information provided by area residents and community groups to analyze the potential future migration of the Upper White River. The study will be based on best available science, using the Washington State Department of Ecology’s CMZ study methodology.

For more information on the methodology behind identifying CMZs, please visit Washington State Department of Ecology’s CMZ webpage.

For more information on the different types of channel migration processes and patterns in Washington State, view the Department of Ecology’s Synthesis for Floodplain Management and Restoration, August 2014.

View the Department of Ecology's Flood Hazard Map finder to find the flood hazard map near you.

Click through the below graphics and images