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    Image Title  Abstract Category Last Updated
    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 05/05/19 02:59 PM
    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
    Portland Flood Response Stages This layer reflects the expected impact and response required for each phase of a flood event. Hazard 04/11/19 01:06 PM
    potential_flood_hazard_pdx Hazard 12/26/01 04:01 PM
       
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