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Wetland Procedures and Tasks

This page contains procedures and tasks that project staff use to request wetland information from region or headquarters wetland staff or wetland consultants.  Chapter 431 of the Environmental Manual  (EM) contains information about wetland policies. 

Procedures for Determining Presence or Absence of Wetlands and Waters 

  • PRO 300-aDetermining Presence or Absence of Wetlands and Waters (pdf 41 kb) This procedure may be appropriate for the Environmental Review Summary and is required for the Environmental Classification Summary to determine if wetlands are absent. Wetland Inventory field work also provides information for early mitigation planning.
  • Task 300-a: Inventorying Wetlands and Waters (pdf 41 kb) outlines work conducted by a wetland biologist to determine if wetlands and waters are present or absent.  This level of work  does not include determining the boundaries of wetlands and waters.

Procedures for Assessing Wetlands and Waters 

  • PRO-431-a: Assessing Wetlands Waters and Streams (pdf 47 kb) -This procedure is required for an Environmental Classification Summary if wetlands are present. It delineates the wetland/upland boundary, provides the wetland category and describes wetland functions.
  • Task 431-a: Conducting Assessments of Wetlands and Waters(pdf 47 kb) – outlines work conducted by a wetland delineator to determine the boundaries of wetlands and waters.  This level of work is appropriate for Scoping when wetlands are present, NEPA, Design and PS&E stages.  It also supports mitigation design and is used as partial evidence that mitigation goals have been met at the end of monitoring.
  • Useful resources include additional details on Wetland Assessment, a Delineation and Assessment Toolbox and a Scope of work template (pdf 131 kb) for consultants. 

Procedures for Analyzing Impacts to Wetlands and Waters  

  • PRO-431-b: Analyzing Impacts to Wetlands and Waters (pdf 40 kb)– This procedure describes the how wetland impacts are analyzed during the NEPA process.
  • Task 431-b: Writing Wetlands Impact Analyses (pdf 40 kb) – This task describes what a Wetland Impact Analysis author does to disclose the wetland impacts for project alternatives, and how they coordinate with the wetland mitigation specialist.
  • Wetland Discipline Report checklist (pdf 50 kb) is available for more complicated projects. 
  • Additional information is available about the purpose for Wetland Impact Analyses and Wetland Impact Types (pdf 21 kb) required for analysis during NEPA
  • After the preferred alternative is selected, impacts (pdf 465 kb) continue to be evaluated as project, and design progresses.

Procedures for Assessing Jurisdictional Ditches  

  • PRO-431-c: Assessing Jurisdictional Ditches (pdf 21 kb) -- This procedure is required for the JARPA if ditches will be moved, filled or changed by a project, even though they are considered to be self-mitigating.
  • Task 431-c: Writing Jurisdictional Ditch Memos (pdf 21 kb) - outlines work conducted by a wetland delineator to identify the limits of Corps jurisdiction of ditches.  It also identifies the documentation required by the Corps for the JARPA.
  • Useful resources include the Clean Water Act Guidance from the Corps of Engineers, and the WSDOT Rapanos webpage. 

Guidance for Designing Wetland Mitigation