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    Image Title  Abstract Category Last Updated
    FEMA Biological Opinion Impact Areas Potential areas impacted by FEMA's Biological Opinion (BioP) related to streams with salmonid habitat. This is an interim mapping established by RPA 2 and does not represent the full scope of area impacted by the Biological Opinion. Hydro 10/19/16 02:49 PM
    National Wetlands Inventory (USFWS) This data set represents the extent, approximate location and type of wetlands and deepwater habitats in the United States and its Territories. These data delineate the areal extent of wetlands and surface waters as defined by Cowardin et al. (1979). The National Wetlands Inventory - Version 2, Surface Waters and Wetlands Inventory was derived by retaining the wetland and deepwater polygons that compose the NWI digital wetlands spatial data layer and reintroducing any linear wetland or surface water features that were orphaned from the original NWI hard copy maps by converting them to narrow polygonal features. Additionally, the data are supplemented with hydrography data, buffered to become polygonal features, as a secondary source for any single-line stream features not mapped by the NWI and to complete segmented connections. Wetland mapping conducted in WA, OR, CA, NV and ID after 2012 and most other projects mapped after 2015 were mapped to include all surface water features and are not derived data. The linear hydrography dataset used to derive Version 2 was the U.S. Geological Survey's National Hydrography Dataset (NHD). Specific information on the NHD version used to derive Version 2 and where Version 2 was mapped can be found in the 'comments' field of the Wetlands_Project_Metadata feature class. Certain wetland habitats are excluded from the National mapping program because of the limitations of aerial imagery as the primary data source used to detect wetlands. These habitats include seagrasses or submerged aquatic vegetation that are found in the intertidal and subtidal zones of estuaries and near shore coastal waters. Some deepwater reef communities (coral or tuberficid worm reefs) have also been excluded from the inventory. These habitats, because of their depth, go undetected by aerial imagery. By policy, the Service also excludes certain types of "farmed wetlands" as may be defined by the Food Security Act or that do not coincide with the Cowardin et al. definition. Contact the Service's Regional Wetland Coordinator for additional information on what types of farmed wetlands are included on wetland maps. For more info: https://www.fws.gov/wetlands/Data/metadata/FWS_Wetlands.xml Hydro 12/15/16 02:47 PM
    Regional Waterbodies Regional streams, rivers, lakes, ponds and other surface water features. Only features large enough to be visible on aerial photographs or delineated from LiDAR data are mapped (more detailed stream information is available as centerlines). This data can be viewed online at www.PortlandMaps.com. Hydro 12/26/18 08:55 PM
    River Bank Treatments Inventory of City of Portland Willamette and Columbia River bank treatments (a.k.a., bank types or habitats). Hydro 08/09/12 02:50 PM
    River Beaches River beaches in the Portland area. Hydro 08/09/12 02:50 PM
    River Depth Contours Willamette and Columbia River depth contours for the City of Portland area. River depths are from ordinary high water (OHW), as measured by the U.S. Army Corps of Engineers in 2004. Hydro 12/26/18 07:04 PM
    River Miles The River Miles layer was created by the CSAR for the purpose of the OR-IRIS map to provide river miles located on the thalweg of seven navigable rivers; the Clackamas, Columbia, Deschutes, Sandy, Snake, Tualatin, and Willamette. Hydro 04/09/19 10:13 AM
    Stream Centerlines Regional stream centerline dataset. Reference sources include 2004 through 2007 LiDAR data, aerial photos, and the mapped stormwater collection system. This data can be viewed online at www.PortlandMaps.com. Hydro 04/17/19 02:32 PM
    subwatersheds_pdx Hydro 06/11/04 04:33 PM
    Top of Bank Lines representing top-of-bank of major rivers and streams in the Portland region (where mapped). River top of bank derived from 2014 LiDAR using an automated mapping method explained in the process steps below. River top of bank will be completely mapped by early 2017. Columbia Slough top of bank derived from visual interpretation of aerial photos and 2007 LiDAR data. Mapping will be expanded over time using LiDAR data and field surveys. Hydro 04/09/19 02:47 PM

       
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