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Advanced Hydrologic Prediction Service (AHPS) is a new and essential component of our Climate, Water, and Weather Services. AHPS is a web-based suite of accurate and information-rich forecast products. They display the magnitude and uncertainty of occurrence of floods or droughts, from hours to days and months, in advance. These graphical products are useful information and planning tools for many economic and emergency managers. These new products will enable government agencies, private institutions, and individuals to make more informed decisions about risk based policies and actions to mitigate the dangers posed by floods and droughts.

The majority of the observed water level data displayed on the AHPS web pages originates from the United States Geological Survey's (USGS) National Streamflow Information Program which maintains a national network of streamgages. In addition, real-time water level information is collected from other federal, state, and local streamgage networks.


River Flood

Map Type

ArcGIS Mapserver

Map Source


NOAA National Weather Service (NWS) Advanced Hydrologic Prediction Service (AHPS), National Centers for Environmental Information (NCEI), NESDIS, U.S. Department of Commerce.