There are different types of flood maps available. 

Flood Risk Maps: The Federal Emergency Management Agency (FEMA) studies flood risk and publishes maps for each community in the United States. These risk maps show the long-term risk of flooding occurring.

Real-time Flood Information: The U.S. Geological Survey (USGS) monitors real-time flooding conditions as they are occurring, while the National Weather Service (NWS) forecasts river flooding.

Learn More

• FEMA's Flood Map Service Center (Interactive Map), FEMA
  Find and download a flood map for your area that shows long-term risk of flooding.
   
• Current Flood Information (WaterWatch) (Interactive Map), U.S. Geological Survey
  Map of rivers that are currently flooding across the United States.
   
• National Flood Insurance Program (Webpage), FEMA
  Overview of the National Flood Insurance Program, with resources for property owners, decision makers, insurance professionals, surveyors, and more
   
• River Flooding Forecast (Interactive Map), National Weather Service
  Shows the short-term chance of flooding for streams across the United States.
   
• Historical Flooding (Website), U.S. Geological Survey
  Data and information on past floods in the United States from 2011-2018.

• Assessing, Mitigating, and Communicating Flood Risk (Webinar), American Geosciences Institute
  2017 webinar on flood risk assessment, mitigation, and communication efforts in the U.S. from national to state and local levels - includes many additional resources on flood risk in your area