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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.

Another website for streamflow data is the National Water Dashboard. Zoom in and hover your cursor over a station to get a quick real-time reading. Click on a station to see a graph and get links to the gage’s site page and data. The National Water Dashboard defaults to showing streamflow but other parameters can be selected in the right column.

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