USGS Surface Water Information
New & Noteworthy
Today's Water Conditions
View maps of current and historical conditionsStreamflow
Flood and high flow
Surface water quality
USGS in Your State
USGS Water Science Centers are located in each state.
Other Water Sites
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The National Flood Frequency (NFF) Program
NOTE: The computer program National Flood Frequency Program (NFF) has been replaced by the National Streamflow Statistics (NSS) program and as such does not contain the most current flood frequency regional equations.