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Wetland photo courtesy NRCS Gary Wilson
Are there Wetlands On my Property?
A wetland determination and wetland boundary delineation may be needed to determine what areas are subject to state Removal-Fill Law and federal Clean Water Act permit requirements, for wetland inventory work, or for other purposes.
Wetland inventory maps (Statewide Wetlands Inventory ) are useful tools for  helping to determine if wetlands may be present in an area.
However, only an on-site inspection of "suspect areas" by a qualified professional can provide a definitive answer.
The Department conducts wetland determinations for the public upon request, as staffing and other priorities (like processing permits) allow. Sometimes, an "offsite" determination by the Department using available wetland and soil maps and information from the landowner suffice to get the process started.
If the offsite determination reveals that wetlands are probable and there are development plans for the site, you may be referred to private consultants who can perform the detailed wetland delineation and mapping and handle the permit application process for you.
All wetland delineation reports should be submitted to the wetlands program leader at the Department for verification and a written jurisdictional determination--a determination of which areas are subject to state permit requirements--prior to any ground alteration.
For further information --
Just the Facts #4: How to Identify Wetlands 
Just the Facts #7: Choosing and Using a Wetlands Consultant 
Wetland Determination Request Form 
Wetland Assessment Methods
HGM Guidebook for the Willamette Valley
HGM Guidebook for Assessing Tidal Wetlands of the Oregon Coast
Hydrogeomorphic Approach for Assessing Wetland Functions (National Level)
Download or Order Form for OFWAM (OR Freshwater Wetland Assessment Methodology)
Wetland Delineation Technical Resources
Wetland 1987 Delineation Manual 
Arid West Delineation Manual Supplement 
Wetland Delineation Report Cover Form
Rules for Jurisdictional Determinations and Wetland Delineation Reports (see Division 90)
Wetland Delineation Report Checklist
Wetland Delineation Report Guidance
DSL Wetland Determination Data Form 
Arid West Supplement Data Form
Hydric Soil List for Oregon Soil Survey Areas
Joint Public Notice - Arid West Interim Regional Supplement
Oregon Soil Survey Reports and Maps
Corps of Engineers Technical Standard for Water-Table Monitoring of Potential Wetland Sites 
Wetland Plants:
National List of Plant Species that Occur in Wetlands 
USDA Plants Database 
USGS Western Wetland Flora
Climatic Data:
Oregon Climate Service
Wetland Training
Northwest Environmental Training Center 
Portland State University - Wetland, River and Watershed Professional Development Training

Society of Wetland Scientists
Other Resources
Classification of Wetlands and Deepwater Habitats of the U.S.
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