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2. Forecast of Stream Flow The April 1, 1998 forecast of inflow to Lake Powell by the National Weather Service, Department of Commerce, for April-July was estimated to be 6,800,000 acre-feet' . The, unregulated inflow to Lake Powell for the period April-July 1998 amounted to 8,625,000 acre-feet , which was about 1 12 percent of the 30-year (1961-1990) average flow. During the April-July 1998 period, changes in storage in Colorado River Storage Project reservoirs including Lake Powell resulted in an overall increase of 4,773,000 acre-feet, with 302,000 acre-feet of evaporation and a 202,000 acre-feet increase in bank storage 3 . Actual regulated inflow to Lake Powell for the period April-July 1998 was 7,761,000 acre-feet. For the period October 1, 1997 through September 30, 1998, the change in reservoir storage, excluding bank storage anal evaporation, at selected reservoirs above Lake Powell was as follows: • Fontenelle decreased 20,100 acre-feet. • Flaming Gorge decreased 17,500 acre-feet. • Taylor Park decreased 8,600 acre-feet. • Blue Mesa decreased 136,500 acre-feet. • Morrow Point increased 4,200 acre-feet. • Crystal increased 600 acre-feet. • Navajo decreased 163,600 acre-feet. The virgin flow4 of the Colorado River at Lee FerryS for the 1998 water year amounted to 17,249,000 acre-feets . ' Including water to be stored upstream in other Colorado River Storage Project Reservoirs. z Adjusted for upstream regulation and depletions. ' Includes Flaming Gorge Reservoir on the Green River. ° Virgin flow is the estimated flow of the stream if it were in its natural state and unaffected by the activities of man. e Lee Ferry, Arizona is the division point between the upper and lower basins of the Colorado River as defined in the Colorado River Compact. It is located about one mile downstream from the mouth of the Paria River and about 16 miles downstream from Glen Canyon Dam. s Based on provisional records subject to revision.