USGS WaterWatch -- Current water resource conditions -Interactive - Excellent data source!

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http://water.usgs.gov/waterwatch/?m=real&r=us&w=real%2Cmap


WaterWatch -- Special Features

Map Interface to All USGS Real-Time Water Data
The real-time water data retrieval map is a portal to all USGS hydrologic monitoring stations that transmit data in real- or near real-time, including surface water, ground water, and water quality sites.

2007 Streamflow summary
The maps and graphs describe streamflow conditions for water-year 2007 (October 1, 2006 to September 30, 2007) in the context of the 78-year period 1930-2007.

Streamgage Statistics Retrieval Tool
A retrieval tool that provides a table of basic summary statistics for the selected streamgage, as computed from daily values, for the period of record.

Google Earth Streamgages
Display real-time streamgages in Google Earth. Google Earth is an interactive, 3D viewer that seamlessly zooms from a global scale down to less than a meter in many urban areas.

Google Maps Streamgages
Display real-time streamgages in Google Maps. Google Maps is an interactive map viewer that opens in your web browser.