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The Forum is continuing to study salinity conditions and is developing flow versus salt load relationships that will reflect present and anticipated conditions and to develop new salinity projections. Salinities at each of the three lower mainstem stations for which numeric criteria have been established have decreased since 1972. 2. Forecast of Stream Flow The April 1, 1987 forecast of inflow to Lake Powell by the National Weather Service, Department of Commerce, for April- July was estimated to be 7,500,000 acre-feet. I The unregulated inflow to Lake Powell for the period April-July 1987 amounted to 7,844,000 acre-feet,2 which was about 95 percent of the 25- year (1963-1987) average flow. During the April-July 1987 period, changes in storage in Colorado River Storage Project reservoirs including Lake Powell resulted in an overall increase of 3,551,700 acre-feet, with 303,000 acre-feet of evaporation and a 310,000 acre-foot increase in bank storage. 3 / Actual regulated inflow to Lake Powell for the period April- July 1987 was 6,728,000 acre-feet. For the period October 1, 1986 through September 30, 1987, the change in reservoir storage, excluding bank storage and evaporation, at selected reservoirs above Lake Powell was: Fontenelle decreased 4,400 acre-feet; Flaming Gorge increased 56 1,400 acre-feet; Taylor Park increased 43,900 acre-feet; Blue Mesa increased 44 1,300 acre-feet; Morrow Point decreased 700 acre-feet; Crystal decreased 700 acre-feet; and Navajo decreased 28 ,500 acre-feet. The virgin flow4 of the Colorado River at Lee Ferry5 for the 1987 water year amounted to 16,620,000 acre-feet. 6 'Including watcr to bc storcd upstrcam in other Colorado Rivcr Storagc Projcet Reservoirs, 'Adjusted for upstream regulation and depletions, 'Includes Flaming Gorgc Rcscrvoir on the Grccn River. ~Virgin flow is the estimated flow of the stream if it wcre in its natural state and unaffected by the activities of man, 5Lee Ferry, Arizona is the division point between the upper and lower basins of the Colorado River as dctincd in thc Colorado River Compact. It is located about one mile downstream from the mouth of the Paria River and about 16 miles downstream from Glcn Canyon Dam, "Bascd on provisional records subjcct to rcvision, 9