IOWA FLOOD RISK MANAGEMENT MAPS

Scour-prone Floodplain Areas
   Areas likely to experience floodplain scour during major flood events
Flood Depth Maps
   High-resolution maps of flood depths associated with the 50-, 20-, 10-, 4-, 2-, 1-, 0.5-, and 0.2-percent annual probabilities
Flood Risk Maps
   Floodplain areas associated with varying degrees of risk
MAP WEB SERVICES
Flood risk management data are available GIS format from the Iowa Geospatial Clearinghouse.
Flood Risk Gradients
https://programs.iowadnr.gov/geospatial/rest/services/SurfaceWaters/FloodGradient/MapServer
Flood Depth Grids
https://programs.iowadnr.gov/geospatial/rest/services/SurfaceWaters
Flood Scour Data
https://programs.iowadnr.gov/geospatial/rest/services/SurfaceWaters/FloodScour/MapServer

GIS DATA ACCESS
Flood risk management data are available GIS format from the IDNR NRGIS library. Metadata describing the available files are located at the following links:
Flood Depth Grids
https://geodata.iowa.gov/dataset/modeled-flood-depth-raster-datasets-eight-flood-events-iowa
Flood Risk Gradients
https://geodata.iowa.gov/dataset/flood-risk-areas

PDF MAPS ACCESS
Flood risk management data is also available in the form of layered PDF files, organized by county. These files allow the user to work offline, while retaining the ability to activate/deactivate various data layers and create custom flood risk management maps.
PDF files can be downloaded at
http://www.iihr.uiowa.edu/iowafloodmaps/flood-risk-management-maps/