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<br />Streamflow in the Arkansas River in the eastern part of the study area <br />has been regulated by John Martin Reservoir since 1943. The historical <br />maximum storage (about 430,000 acre-ft) in the reservoir occurred in 1965. <br />During water years 1965-73, annual release from the reservoir averaged about <br />200,000 acre-ft (fig. 6). During water years 1974-78, the mean annual release <br />decreased to 92,700 acre-ft, and the reservoir was dry much of the time. During <br />water years 1979-86, mean annual release increased to about 220,000 acre-ft, <br />and in water year 1987, the largest historical annual release (539,300 acre-ft) <br />Occurred. In water year 1988, the release volume decreased, but still remained <br />large (294,900 acre-ft): <br /> <br /> 600 r- <br />f- I <br />w <br />w 500 I <br />u- <br />w <br />a: <br />u <br /><( <br />u- <br />0 I <br /><J) <br />0 400 <br />Z <br /><( <br /><J) <br />:J <br />0 <br />r <br />f- 300 . I <br />~ <br />~. -1 <br />0 <br />-' <br />u- <br />:E 200 <br /><( <br />UJ <br />a: <br />f- <br /><J) 1 <br />-' <br /><( 100 - <br />:J <br />Z <br />Z <br /><( I <br /> 0 <br /> 1940 1950 1960 1970 1980 1990 <br /> WATER YEAR <br /> <br /> <br />Figure 6.--Annual streamflow of the Arkansas River below <br />John Martin Reservoir, Colo., water years 1944-88. <br /> <br />16 <br />