Metadata: Wetlands


Category Hydro
Feature Dataset Name STAND-ALONE
Database Type SDE
Originator City of Portland
Bureau Bureau of Planning and Sustainability
Publication Date 10/18/2005
Abstract National Wetland Inventory (NWI) with revisions made by local governments in the tri-county region. Portland wetlands are updated from the original Metro dataset by City of Portland, Bureau of Planning & Sustainability to refine geometry, remove erroneously mapped wetlands, and add missing wetlands. This data can be viewed online at
Purpose For identifying the location of wetlands.
Supplemental Information This dataset is regularly updated.
Last Dataset Update 01/02/2024 18:52
Last Source Update 01/02/2024 09:43
Maintenance/Update Frequency As needed
Extent Clackamas County, Multnomah County, and Washington County, Oregon
Data Type Vector
Shape Type Polygon
Feature Count 6567
Horizontal Position Accuracy Horizontal accuracy varies. For wetlands mapped using photogrammetric data, accuracy appears to be roughly +/- 10' in most circumstances. Wetlands mapped with differential GPS are within +/- 3'. Horizontal accuracy of wetlands mapped with aerial photography and LiDAR is +/- 5'. The horizontal accuracy of wetlands based on other sources (such as Metro) is unknown. Due to the difficulty in identifying an exact boundary of a wetland feature without a detailed field survey, wetland location should be considered approximate.
Horizontal Position Accuracy Link Neither
Progress Complete
North Bounding Coordinate 768281.312664047
South Bounding Coordinate 582344.875
East Bounding Coordinate 7754045
West Bounding Coordinate 7496235.5
Theme Keyword(s) wetlands, waterbodies, hydrology
Theme Keyword Thesaurus None
Place Keyword(s) Portland, Multnomah County, Washington County, Clackamas County, Oregon
Place Keyword Thesaurus None
Access Constraints Available for Public Use
Use Constraints These data are distributed under the terms of the City of Portland Data Distribution Policy. Care was taken in the creation of this data but it is provided "as is".

The City of Portland cannot accept any responsibility for errors, omissions, or positional accuracy.
Source Dataset Type File Geodatabase
Output Geodatabase EGH_Public
Distribution Grid: State plane coordinate system 1983(91).
Units: International feet
Datum: North American Datum of 1983/1991 (HPGN)
Liability: The information in this file was derived from digital databases on the City of Portland GIS. Care was taken in the creation of this file. The City cannot accept any responsibility for errors, omissions, or positional accuracy. There are no warranties, expressed or implied.
Format: Shapefile or File Geodatabase Feature Class - Data will be provided via City of Portland FTP Site.
Online Resource:
Online Instructions: City of Portland Public/Open Data is distributed via the PortlandMaps Open Data Site - Data not available on the PortlandMaps Open Data site can be requested by contacting the City of Portland CGIS Group -
Transfer Size: varies
SPCS Zone Identifier: 5076
Neil Loehlein
1900 SW 4th Avenue, Suite #7100
Portland, OR 97201

City of Portland - BPS
52608.png 112.06Kb X
Wetland_Data_Refinement_Project_Report.pdf 848.49Kb X
01/01/2010 Wetlands were modified in remapped in January 2010 using Oregon Department of State Lands (DSL) permit information, field surveys from the City of Portland's Bureau of Environmental Services and Parks & Recreation, and 2004/2005/2007 LiDAR data (a complete description of the mapping methodology is attached). As new DSL and survey information becomes available, the data will be modified accordingly.
02/05/2020 The original National Wetland Inventory (NWI) was modified by Metro with revisions made by other local governments in the tri-county region. These revisions were coordinated by Metro's Growth Management department. Wetlands are registered to the U.S. Geological Survey (USGS) 7.5 minute quadrangles. For more information, refer to:
05/10/2020 Wetlands within the City of Portland and the Multomah County pockets were remapped using the 2002 Metro wetland inventory polygon shapefile as the original reference. All attributes from any Metro-mapped data were maintained in the updated waterbodies. Wetlands were reviewed and remapped as necessary based on data collected in the field, correcting discrepancies between the wetland data and the aerial photos, removing filled wetlands, etc. To date there has been no comprehensive review of ALL wetlands within the City and County pockets. Photogrammetric data (2' contours) and aerial photos were used as reference for remapping waterbodies. Any open water feature visible on the aerial photos or apparent as a depression in the 2' contour data was mapped. Waterbodies identified in the field were remapped to correspond with visual assessment (as recorded on a field sheet) and any GPS points collected. Waterbodies located in this matter were attributed with a "GPS_DATE". All of this supporting information is in digital format and available from the City of Portland, Bureau of Planning.

Web Services

Service Description Feature Access Layer
BES_Layers Referecne layers as used by various BES web content Dynamic City of Portland Wetlands
BDS_Layers Map layers used to facilitate the permitting process Dynamic City of Portland Wetlands
BDS_Layers Map layers used to facilitate the permitting process Dynamic Wetlands
BPS_Misc Collection of micellaneous layers published to support Portland Bureau of Planning and Sustainability web mapping applications. Dynamic City of Portland Wetlands

Attribute Tables & Domains

Table Description
Table Jurisdiction
Column Sort Column Name Column Alias Column Type Column Size Domain Value(s) Column Description
1 CODE Wetland Code String 8
U.S Fish & Wildlife National Wetland Classification wetland code (if known)
1 SOURCE Reference Source String 30
Aerial Photos Wetland mapped using current aerial photos X
DSL Permit Wetland mapped based on documentation supporting a Oregon Department of State Lands (DSL) permit X
Field Survey Wetland mapped based on GPS information or other data collected in a field survey X
Land Use Review Wetland mapped based on documentation supporting a land-use review (LUR) case X
LiDAR Wetland mapped based on topography derived from 2004, 2005 or 2007 LiDAR data X
Photogrammetrics Wetland mapped based on existing photogrammetric data (i.e., 2' contours) derived from 1990's aerial photographs X
The reference source for the mapped wetland
1 MODIFIER Modified By String 30
BPS City of Portland Bureau of Planning & Sustainability X
BES City of Portland Bureau of Environmental Services X
COG City of Gresham X
CWS Clean Water Services X
Metro Metro X
PPR City of Portland Parks & Recreation X
WL City of West Linn X
Last organization to edit the wetland polygon
1 MOD_DATE Modification Date Date 36
Date of the last modification
A unique software ID for each polygon. May change when data is modified.
1 NAME NAME String 50
Name of the wetland (if known)
1 LLID LLID Integer 4
A unique ID for the wetland based on a latitude/longitude point that falls within the polygon
1 SOURCE_REF Reference Source Details String 30
Any additional reference information regarding the mapping source (LiDAR flight date, DSL case number, etc.)
1 NHD_FCODE NHD Feature Code Integer 4
National Hydrology Dataset (NHD) feature code
1 WS_ID Watershed ID Integer 4
Unique ID for watershed containing the waterbody
1 HUC12 HUC Numeric 8
12-digit USGS hydrologic unit boundary (HUC) of the wetland
1 HUC12_NAME HUC Name String 80
Name of the USGS hydrologic unit boundary (HUC)
1 MOD_NAME Modifier Name String 15
Initials of the last person to edit the wetland polygon
1 CREATED_BY Created By String 15
Name of the organization that originally created the wetland polygon. Same domain as the "MODIFIER" attribute.
1 CREATEDATE Creation Date Date 36
Date the wetland polygon was originally created.
1 FIELD_DATE Field Date Date 36
Date of any field visit to the wetland.
1 REVIEW Flag for Review? String 5
Indicates whether the wetland polygon needs further review (i.e., the mapped location is approximate).
1 NOTES NOTES String 255
Any notes related to the wetland
1 SUBAREA Maintaining Agency String 30
Regional agency responsible for the mapping of the wetland