This index value plot is explaining the "Streamflow Conditions Plots." The red lines on graph are plots for the average streamflow. It is showing the every day average of the water resource region or the gaging stations over 30 years. You may notice there are gaps in the map which signify days where there was less than 2/3 reported data from the stations.
Map url: water.usgs.gov/.../regplots/real/real_us_2.gif
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