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Oregon Rapid Wetland Assessment Protocol (ORWAP)

ORWAP consists of several components - all downloadable below. Components include the User's Manual; two Excel spreadsheets (assessment questions and models); four PDF versions of the data forms that users fill out; Technical Supplement; and a separate guidance document for using ORWAP for state and federal permitting. 
ORWAP is used for assessing wetlands for purposes of the state Removal-Fill Law, and is also recommended by the Portland District Corps of Engineers. However, please see DSL's administrative rules regarding those instances when Oregon's reference-based HGM methods must be used, instead of ORWAP (OAR 141-085-0685). 
ORWAP User's Manual Version 3.1  

Errata for V.3.1 September 2016 
The ORWAP User's Manual provides step-by-step, illustrated instructions for using ORWAP. It also includes background information, changes in the refined version, using ORWAP for various purposes, and descriptions of the models. It is essential that anyone applying ORWAP read the manual thoroughly. See below and/or contact DSL for information regarding training in ORWAP. 
ORWAP Calculator (Excel Spreadsheet) Version 3.1 November 2016
This spreadsheet contains a cover page to enter basic information about the assessment, worksheets for entering office and field data, a Scores sheet (scores automatically generated by ORWAP and worksheets detailing the computation of function and value scores). The PDF forms below are user-friendly, formatted versions of the data form worksheets for use in the field. Print and use these PDF versions rather than the worksheets for collecting your data.
Cover Page Form  
Field Data Form T (tidal)  
Field Data Form F  
Field Data Form S

ORWAP Supplemental Information (Excel Spreadsheet) Version 3.1 November 2016
This separate spreadsheet contains a wealth of additional information. Explore it! The worksheets that you will need for answering specific questions - and are most likely to refer to regularly and want to take with you in the field - are provided below as concise, formatted PDF files. The name of the related worksheet is given in parentheses.

Technical Supplement: Procedures Used to Refine, Re-calibrate and Test ORWAP version 3.1
This document provides information on the models, weighting and scoring, normalization of scores, and score ratings use in ORWAP v.3.1.

Oregon Explorer ORWAP Map Viewer (cannot be opened with Chrome or Mozilla browsers)
The ORWAP map tool provides site-specific mapping and reporting information needed to answer most of ORWAP's office indicator questions. It also allows ORWAP users to upload completed assessments.

Guidance for Using ORWAP in State and Federal Permitting Programs
This document was developed along with ORWAP to provide guidance to applicants, consultants and regulatory staff for using ORWAP for state and federal permit purposes.
Helpful Website Tools
USGS National Map Viewer:
Wetland Explorer ORWAP Reporter Assessment website:

USDA's Web Soil Survey website:
Oregon DEQ LASAR website:
PRISM Data Explorer for Mean Annual Precipitation Data:
Portland Audubon Important Bird Area (IBA) map:
A site that draws and measures the CA automatically if a stream intersects your wetland:
Previous ORWAP Versions  
Previously-distributed versions of ORWAP are provided here. The purpose is to allow users to apply an identical ORWAP version to a site that is being assessed over a period of years.  However, if you used version 2.0 and completed data entry, please contact Paul Adamus (see e-mail below) for instructions on pasting answers into the updated version 2.0.2.  This is important due to a couple of cell/formula errors discovered in version 2.0.  Version 2.0.1 was the first version maintained for future use. 
Version 2.0.2
ORWAP Calculator (Excel Spreadsheet) Version 2.0.2 May 2012
ORWAP Supplemental Information (Excel Spreadsheet) Version 2.0.2 June 2012
CoverPg Data Form  
Office Data Form  
Field F Data Form  
Field S Data Form  

Version 2.0.1

ORWAP Calculator (Excel Spreadsheet) Version 2.0.1
ORWAP Supplemental Information (Excel Spreadsheet) Version 2.0.1
CoverPg Data Form 
Office Data Form 
Field F Data Form 
Field S Data Form  

Additional Information

For more information about ORWAP, contact Paul Adamus at Adamus7@comcast.net    or Kathy Verble at Kathy.Verble@state.or.us.