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USGS provides access to over 135 years of high-quality and discoverable water data collected at more than 1 million monitoring locations across the United States and territories.
Data Coverage
United States
Period of Record
Current Conditions, Historical data (period of record varies)
WaterWatch is a U.S. Geological Survey (USGS) World Wide Web site that displays maps, graphs, and tables describing real-time, recent, and past streamflow conditions for the United States.