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    Image Title  Abstract Category Last Updated
    FEMA 100-year Floodplain Areas identified by the Federal Emergency Management Agency (FEMA) as having a 1% annual chance of flooding. Known as the "Special Flood Hazard Area" (SFHA), which is also commonly referred to as the 100-year floodplain. Based on November 2010 FEMA maps, with subsequent "Letters of Map Revision" (LOMR) information incorporated as approved by FEMA. Hazard 06/10/16 03:47 PM
    FEMA 500-year Floodplain Areas identified by the Federal Emergency Management Agency (FEMA) to have a 0.2% annual chance of flooding. Commonly known as the 500-year floodplain. Hazard 06/10/16 03:47 PM
    FEMA Flood Hazard Areas The FEMA Flood Hazard Layer represents the location and attributes of flood insurance risk zones from the Flood Insurance Rate Map (FIRM) databases published by the Federal Emergency Management Agency (FEMA), and any Letters of Map Revision (LOMRs) that have been issued against those databases since their publication date. It is updated on a monthly basis. The FIRM Database is the digital, geospatial version of the flood hazard information shown on the published paper FIRMs. The FIRM Database depicts flood risk information and supporting data used to develop the risk data. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual-chance flood event, and areas of minimal flood risk. The floodway, 100-year floodplain/SFHA (Special Flood Hazard Area), and the 500-year floodplain are all derived from this dataset. Hazard 02/27/19 10:10 AM
    FEMA Floodway FEMA Floodway. Based on November 2010 FEMA maps, with subsequent "Letters of Map Revision" (LOMR) information incorporated as approved by FEMA. Hazard 02/27/19 10:12 AM
    Flood Insurance Rate Map Index Polygons representing the index of FEMA flood insurance rate maps. Hazard 01/03/11 10:49 AM
    Floodplain - 1996 Portland Flood Area of inundation in the 1996 flood, as mapped by the US Army Corps of Engineers Hazard 02/27/19 11:49 AM
    Hazardous Materials Sites Point features representing the locations of Extremely Hazardous Substances as defined in the Oregon State Fire Marshal's "Community Right to Know" program. In 1985, the Oregon Legislature passed the Oregon Community Right to Know (CR2K) and Protection Act. The purpose of this law is to provide first responders and the public with information about hazardous substances in their response areas and neighborhoods. The law directs the Office of State Fire Marshal to survey business and government facilities for information about the presence of hazardous substances and to collect information about incidents involving hazardous substances. The law further directs the OSFM to provide planning and training assistance to local jurisdictions on hazardous substance emergency response and preparedness. Hazard 12/26/18 05:00 PM
    landslide_inv_deposits_bes_pdx Hazard 03/29/19 06:39 PM
    landslides_bes_pdx Hazard 12/08/16 05:59 AM
    lust_bes_pdx Leaking Underground Storage Tank data is downloaded periodically from Oregon Department of Environmental Quality. Hazard 12/18/18 04:00 PM

       
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