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How can I obtain real-time streamflow information?

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Welcome to CoreFacts, where we're always short on time and big on science. I'm Steve Sobieszczyk. Today we have another pretty straight forward question.

How can I obtain real-time streamflow information?

Real-time streamflow data are available from the USGS for over 4000 stream-gaging stations throughout the United States. These data are available online from the National Water Information System, or NWIS, at Real-time data typically are recorded at 15-60 minute intervals, stored onsite, and then transmitted to USGS offices every 1 to 4 hours, depending on the data relay technique used. Recording and transmission times may be more frequent during critical events. Data from real-time sites are relayed to USGS offices via satellite, telephone, or radio and are available for viewing within minutes of arrival.

And now you know. Join us every weekday for a new CoreFact. If you have a question you think we should answer on the air, email it to us at or leave us a voicemail at 703-648-5600; long distance fees do apply.

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