This tool allows users to explore the full set of inundation maps that shows where flooding would occur given a selected stream condition. Users can also access historical flood information and potential loss estimates based on the severity of the flood.

The U.S. Geological Survey works with the National Weather Service, the U.S. Army Corps of Engineers, and the Federal Emergency Management Agency to connect communities with federal flood-related science, thereby ensuring the quality and consistency of flood inundation maps across the country. The Flood Inundation Mapping Program is a cooperative effort that helps communities protect lives and property by providing tools—such as this one—and information to help them understand their local flood risks and make cost-effective mitigation decisions. The program's two main functions are:

• Partnering with local communities to assist with the development and validation of scientifically sound flood inundation map libraries that show where flooding may occur over a range of water levels in the community’s local stream or river, and
• Providing online access to flood inundation maps, along with real-time streamflow data, flood forecasts, and potential loss estimates.