USGS Water Data Explorer
The National Water Information System (NWIS) is the Nation's principal repository of water resources data. It includes data from more than 1.5 million sites, some in operation for more than 100 years.
Most NWIS data can be accessed directly at
The USGS Water Data Explorer searches a cached (December 2008) subset of most flow, level, and water-quality data from NWIS for streams, ground water, lakes, reservoirs, springs, and estuaries.
Other water data may be available. Try contacting a local USGS Water Science Center.
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