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Watershed Assessment Manuals
OR Watershed Assessment Manual
   Each chapter of the manual is available for download as an 
   Adobe Acrobat file from this page. If you would like to obtain 
   a hard copy of the manual, please mail your request along 
   with a $45.00 fee payable to “Oregon Watershed
   Enhancement Board” to:
 
   Publication Request
   Oregon Watershed Enhancement Board
   775 Summer Street NE, Suite 360
   Salem, Oregon 97301-1290
   For further assistance, please call (503) 986-0178
 
   All files are in PDF format unless otherwise noted.
 
 
 
 
 
 
 
 
Appendices
 
Ecoregion Descriptions
The purpose of this appendix is to organize information that can be helpful to Watershed Councils in interpreting watershed conditions. The Appendix provides information on the ecological characteristics of Oregon´s ecoregions. The descriptions provide information on the potential riparian conditions, disturbanc regimes, hydrologic conditions, stream channel types and other characteristics of watersheds in each ecoregion. The Riparian and Hydrology sections of the manual utilize this information to simplify their assessment process. Addendum 1 at the end of this document gives the percentage of watershed area for each fifth-field watershed in Oregon by Ecoregion type.
 
Hydrologic Process Identification for Eastern Oregon
The purpose of this appendix is to provide information about the hydrologic processes that produce peak flows in streams situated in eastern Oregon. The appendix was prepared to provide a background hydrologic reference for Watershed Councils and others embarking on watershed assessments. Background information on both the season in which peak flows occur and the type of hydrologic processes which generate peak flows can support watershed analyses undertaken to assess land use impacts on aquatic resources. Peak flow increases in response to land use activities can be problematic if they alter the channel geometry and subsequently produce negative impacts to aquatic habitat. Analysts conducting watershed studies should understand which types of hydrologic processes are producing peak flows in their watershed prior to selecting appropriate analysis tools.
 
Hydrologic Process Identification For Western Oregon
The purpose of this project is to determine the hydrologic processes which produce peak flows throughout western Oregon. The identification of peak flow seasons and generating processes in western Oregon can provide some basic information about the types of flood events occurring in a watershed. The analysis of peak flows and changes in their magnitude is often undertaken to assess land use impacts on aquatic resources. Peak flow increases in response to land use activities may alter the channel geometry which could have potential negative impacts on habitat. (September 1998- courtesy of Boise Cascade)

Estuary Assessment
This estuary assessment and prioritization method constitutes Component XII of the Oregon Watershed Assessment Manual. This module can serve as a stand-alone method, but is best used as a component of the larger assessment. Introductory material in this document describes the basic characteristics and functions of estuaries and tidal wetlands. The remainder of the document outlines the estuary assessment in seven steps.
 
To obtain a hard copy of the publication, contact:
Publication Request
Oregon Watershed Enhancement Board
775 Summer Street NE, Suite 360
Salem, Oregon 97301-1290
For further assistance, please call (503) 986-0178
 
 
Estuary Assessment (PDF)