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

• Summary of floodplain Requirements (pdf 1.6 mb)
• Applicable Statutes and Regulations (pdf 1.6 mb)
• Governor’s Directive on Agricultural Lands (pdf 1.6 mb)
• WDFW memornadum of agreement for Transportation Acitivities
• Floodplain Discipline Report (pdf 1.6 mb) includes checklist and decision flow chart
• FHWA Floodplain Technical Advisory
• Floodplain Permits and Approvals (pdf 1.6 mb)
• Non-Road Project Requirements (pdf 1.6 mb)

Floodplain Resources

• Comprehensive Flood Hazard Management Plans - State guidance and standards for development of floodplain regulations
• Local Floodplain Management - Links to ordinances for cities and counties
• Emergency Relief Procedures Manual - Guidance for obtaining federal funding for flood damage repair of transportation infrastructure.
• WSDOT GIS Workbench
• Acronyms and Abbreviations (pdf 1.6 mb)
• Glossary (pdf 1.6 mb)
  

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