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Advanced Hydrologic Prediction Service (AHPS) River Gauge data

Associated Agencies

National Weather Service (NWS) Advanced Hydrologic Prediction Service (AHPS)

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. An interactive map allows users to view current observations and forecasts.

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.


How to

  • Use the tabs at the top to toggle between current “River Observations,” “River Forecasts,” and more
  • Use the mouse and plus or minus to navigate around the map
  • Select a station to see a time-series graph of that particular station
  • Under “River Forecasts”, use the sliding bar at the top to see forecasts for particular days
  • Select “Download” to download the visible area or selected station in various formats


AHPS Interactive Map: view current and forecasted stream levels as well as magnitude and likelihood of flooding for the United States

AHPS Downloads: link to AHPS Shapefiles and KMZ Data


Helpful links to general information, specific technical instructions, and referenced articles related to this dataset.

AHPS Background

Representative Image
Example AHPS river gauge map