http://images.google.com/imgres?imgurl=http://water.usgs.gov/waterwatch/regplots/pa01d/pa01d_us_2.gif&imgrefurl=http://water.usgs.gov/waterwatch/%3Fm%3Dpa01d%26w%3Dplot&h=450&w=550&sz=6&hl=en&start=13&tbnid=UFJF3QgC5v36cM:&tbnh=109&tbnw=133&prev=/images%3Fq%3Dindex%2Bvalue%2Bplot%26gbv%3D2%26ndsp%3D20%26hl%3Den%26sa%3DNThe above image is an index value plot for the United States showing the current water resource conditions recorded in January 2001. The information is calculated each day as an average of the streamflow index values for all the stream gaging stations located in the state or water resource region that have at least 30 years of recordings.
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