Water Resources of the United States


National Water Information System (NWIS)

View current and historical streamflow, groundwater level, and water-quality data

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For more data options, explore our data discovery tools.

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Click map to go to current water resources conditions in the U.S.

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USGS Water Science Centers are located in each state

USGS In Your State (clickable)There is a USGS Water Science Center office in each State.
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Cooperative Water Program

Products > Hazards


 Hazard and Risk Assessment Products by Subject

Recently Added Products in Hazards


thumbnail new Ohio flood inundation maps –Maps are now available for Findlay, Killbuck, and Ottawa, Ohio. These maps show where flooding occurs at various high river levels.  They are just one example of USGS products and services developed in the 100 years since Ohio’s devastating Great Flood of 1913. (Press release) (Note: USGS WaterNow is available, allowing you to send an email or text message containing a USGS current-conditions streamgaging site number and quickly receive a reply with its most recent observation(s).

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Page Last Modified: Tuesday, 04-Mar-2014 10:30:43 EST