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years from 1998 through 2004 is unusual, it is perhaps not unprecedented. The period from <br />1987-1992 was likewise characterized by a series of below-average years, with several years of <br />low flow occurring in succession. In the 16-year period from 1954-1969, the average annual <br />discharge was exceeded in only four years, half the expected number. The 2000-2004 drought is <br />notable for its severity, however, strings or three or four low-flow years in a row have occurred <br />several times in the past, and they are very likely to occur in the future. <br />B <br />250 - <br />Colorado River near <br />Cameo, CO (USGS 9095500) <br />;n 200- <br />E <br />150 <br />ca <br />L <br />U <br />5 100 <br />m <br />c <br />Q 50 <br />0 <br />1930 1940 1950 1960 1970 1980 1990 2000 <br />Figure 9. Trends in annual runoff of the Colorado River based on streamflow records <br />from USGS gauging stations (a) near Palisade, CO, and (b) near Cameo, Colorado. <br />25