The Wetland Guidelines web pages are a central location where WSDOT staff and consultants access the latest wetland technical tools, templates, and guidance.  Our goal is to promote consistency across WSDOT in the way we collect, develop, and report wetland information. 

WSDOT's Wetland Mitigation Technical Group develops these guidelines, which are updated regularly as tools and guidance are completed or revised.

Featured Items

• Arid West Regional Supplement (U.S. Army Corps of Engineers 2008a). Required on all delineations for WSDOT projects in the arid west region of Washington, along with Arid West Supplement data forms (doc 276 kb).
• Western Mountains, Valleys, and Coast Interim Regional Supplement. (U.S. Army Corps of Engineers, 2008b). Required on all delineations for WSDOT projects in the western mountains, valleys, and coasts region of Washington, along with Western Mountains, Valleys, and Coast Supplement data forms (doc 274 kb).
• Corps of Engineers Wetland Delineation Manual (Environmental Laboratory 1987 On-line edition). As modified by the appropriate regional supplement.
• Wetland Rating System Boundary Between Eastern and Western Washington. Ecology's recent guidance.

Wetland Guidelines

• Regulations
• Delineation & Assessment 
• Delineation & Assessment Toolbox
• Mitigation
• Mitigation Links
• Construction
• Monitoring
• Monitoring Reports
• Internship  

Most Requested Wetland Links

• Data Forms: Delineation and Rating
• Delineation Manuals & Methods
• WSDOT-specific Delineation Guidance 
• WSDOT-specific Mitigation Guidance 
• Monitoring Methods (pdf 90 kb)
• Performance Criteria Guidance 
• Wetland and Stream Assessment Report Template (doc 457 kb)
• Wetland and Stream Mitigation Report Template (doc 1.2 mb)

Related Links

• Environmental Procedures Manual (pdf 210 kb)
• Roadside Manual (pdf 5.4 mb)