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Where can I get real-time and historical streamflow information?

The best starting point for USGS streamflow data is the interactive National Water Information System (NWIS): Mapper website. Zoom in to your area of interest or use the search options in the left navigation window. The map displays active surface-water sites by default, but you can change the type of water site (surface-water, groundwater, springs, atmospheric) and select to show inactive sites in the left menu. 

The USGS Water Resources Data and Web Tools websites are other good starting points.

If you are unable to find the information that you need, contact the USGS Water Science Center for that state.

Learn more: Tutorials for using the National Water Information System