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Oregon Rapid Wetland Assessment Protocol

The Oregon Rapid Wetland Assessment Protocol (ORWAP) is a tool for quickly assessing wetland functions and values in all wetland types throughout Oregon. ORWAP is used for assessing wetlands for the purposes of Oregon’s Removal-Fill Law, as well as purposes related to Section 404 of the federal Clean Water Act.

ORWAP Components

ORWAP components are available for download below, as well as on the Aquatic Mitigation Portal of Oregon Explorer.

ORWAP User’s Manual Version 3.2 (PDF)
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 Version 3.2 (Excel Spreadsheet)
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).

Field Data Worksheets (PDF): The PDF forms below are user-friendly, print-ready versions of the data form worksheets to use when collecting data in the field.
ORWAP Supplemental Information (Excel Spreadsheet) Version 3.2
This spreadsheet provides a wealth of information on plant species, rare animal species, invertebrates, and important bird areas. Explore it!

ORWAP Technical Supplement Version 3.2
Procedures used to refine, re-calibrate and test ORWAP version 3.2 and 3.1. This document provides information on the models, weighting and scoring, normalization of scores, and score ratings used in ORWAP v. 3.2 and 3.1.

Oregon Explorer ORWAP and SFAM Map Viewer
The map viewer provides site-specific mapping and reporting information needed to answer most of ORWAP's office indicator questions.

Guidance for Using ORWAP version 3.2 in State and Federal Permitting Programs
See Appendix F of the ORWAP User’s Manual. 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 Resources
Previously distributed versions of ORWAP are provided here to allow users to apply an identical ORWAP version to a site that is being assessed over a period of years.

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

Version 2.0
If you used version 2.0 and completed data entry, please contact Paul Adamus for instructions on pasting answers into the updated version 2.0.2.  This is important due to several cell/formula errors discovered in version 2.0.  Version 2.0.1 was the first version maintained for future use.


Melody Rudenko
Aquatic Resource Mitigation Specialist
Phone: 503-508-4035

For more information about ORWAP, contact protocol developer Paul Adamus, Adamus Resource Assessment Inc., at