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WSDOT Floodplains Guidance

US 101 Hoh River flood damage
The Environmetal Procedures Manual (EPM) Floodplains chapter describes the process and resources required to evaluate and address the potential impact of WSDOT projects on floodplains. 

This EPM chapter focuses mainly on road projects.

We briefly address ferries, airports, rail, and non-motorized transport projects in Section 432.

Process for Floodplains

Floodplain Resources