This first-ever USGS summary of seasonal, regional, and national streamflow conditions for water year 2006 has recently been released.

From the site: “The maps and graphs appearing in this summary describe streamflow conditions for water-year 2006 (October 1, 2005 to September 30, 2006) in the context of the 77-year period 1930-2006, unless otherwise noted. The illustrations are based on observed data from the U.S. Geological Survey’s (USGS) National Streamflow Information Program. The period 1930-2006 was used because prior to 1930, the number of streamgages was too small to provide representative data for computing statistics for most regions of the country.”

Get the report from the USGS.
TPE Link - Fluvial Systems: Channel Geometry and Flow

Map courtesy USGS (Source)