Identifier: https://navigator.state.or.us/arcgis/rest/services/Framework/Haz_GeneralMap/MapServer/2

title: Haz_GeneralMap/Oregon 100-yr Flood Zones

Description: This layer includes the best available “100-year” floodplain data for Oregon as represented by FEMA’s Flood Insurance Rate Maps (FIRM). The FEMA flood hazard is defined as the area that will be inundated by the flood event having a 1-percent chance of being equaled or exceeded in any given year; this is also referred to as the base flood, High Risk Area, or the Special Flood Hazard Area (SFHA). Digital representations of this layer are based on the following categories: 1) FEMA Effective – the approved current regulatory data that is the basis of NFIP regulations and flood insurance requirements; 2) FEMA Preliminary – a new study that is in the preliminary stage of review, not yet effective, but where the project is unlikely to change and data can otherwise be considered current; 3) FEMA Q3 - scanned from the existing FIRM “paper maps” to create a thematic overlay of flood risks. The Q3 flood layer is designed to be a tool for general hazard awareness and floodplain management. Its spatial accuracy varies and data from this source should be used with caution - it is not to be used for making a single site flood hazard determination. 4) State Digitized –created by digitizing the paper FIRMs using orthophoto control for areas in the state that had no digital representation of the FEMA floodplain. While the quality is considered good there is no quality control and users should apply similar caution as with the Q3 data. Layer last updated 01/23/2013.

Abstract: This layer includes the best available “100-year” floodplain data for Oregon as represented by FEMA’s Flood Insurance Rate Maps (FIRM). The FEMA flood hazard is defined as the area that will be inundated by the flood event having a 1-percent chance of being equaled or exceeded in any given year; this is also referred to as the base flood, High Risk Area, or the Special Flood Hazard Area (SFHA). Digital representations of this layer are based on the following categories: 1) FEMA Effective – the approved current regulatory data that is the basis of NFIP regulations and flood insurance requirements; 2) FEMA Preliminary – a new study that is in the preliminary stage of review, not yet effective, but where the project is unlikely to change and data can otherwise be considered current; 3) FEMA Q3 - scanned from the existing FIRM “paper maps” to create a thematic overlay of flood risks. The Q3 flood layer is designed to be a tool for general hazard awareness and floodplain management. Its spatial accuracy varies and data from this source should be used with caution - it is not to be used for making a single site flood hazard determination. 4) State Digitized –created by digitizing the paper FIRMs using orthophoto control for areas in the state that had no digital representation of the FEMA floodplain. While the quality is considered good there is no quality control and users should apply similar caution as with the Q3 data. Layer last updated 01/23/2013.

References: https://navigator.state.or.us/arcgis/rest/services/Framework/Haz_GeneralMap/MapServer/2

Bounding Box:

Haz_GeneralMap/Oregon 100-yr Flood Zones

RDF Metadata