USGS Surface Water Information
New & Noteworthy
Today's Water ConditionsView maps of current and historical conditions ![]() ![]() ![]() ![]() ![]() USGS in Your StateUSGS Water Science Centers are located in each state. ![]() Other Water SitesPDF Reader!Documents are presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge. |
The National Flood Frequency (NFF) ProgramNOTE: The computer program National Flood Frequency Program (NFF) has been replaced by the National Streamflow Statistics (NSS) program and as such does not contain the most current flood frequency regional equations. |