Streamflow, Temperature and other parameters from Sampling Stations

Approximately 5,000 of the 6,900 U.S. Geological Survey sampling stations are
equipped with telemetry to transmit data on streamflow, temperature, and other
parameters back to a data base for real-time viewing via the World Wide Web. A
map of the realtime stations is produced every day.

Each USGS District Office serves the realtime data of the stations it services.
A list of these pages may be seen at http://waterdata.usgs.gov/nwis/rt . Every
District realtime page (some have several pages) contains a list of the
stations for which realtime data are available and a link to the data for each
station.

Every hour, an automatic process retrieves the realtime pages from each
District and parses them to find the stations served and the URL for each
station's data. The station numbers on this list are matched against a master
list of USGS stations to find the station name and the latitude/longitude of
each realtime station. This information is used to prepare an updated point
coverage.