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. . Mr. J. William McDonald October 17, 1989 Page 5 8. It should be understood that this proposed operating procedure is subject to approval by both the CWCB and the District Board of Directors. All of the numbers shown above are preliminary and based upon the best currently available data. Once the reservoir enlargement has been completed further refinements in this proposed operation plan will probably be needed. Operational decisions will be made in consnltation with the CWCB and the Division of Wildlife. Conclusions Table 2 attached shows how releases from storage in Black Lakes will serve to augment streamflows in Gore Creek to the benefit of the fishery. In each of the critical years shown, releases from Black Lakes would be sufficient to prevent losses in adult habitat for brown trout through March 15. Normally, streamflows increase by 20 to 30 percent through the month of March and severe cold spells that would significantly reduce flows in the later half of March tend to be short-lived. These factors tend to diminish the risk of using up all of the 300 acre feet of augmentation water by mid-March. There is obviously some risk associated with variations in the pattern of wintertime diversions from year to year. (E.g.. in some years February may be a better ski month than January resulting in more water use in February than is typical.) We believe that the magnitude of these changes will be small and manageable through refinements in the operation of Black Lakes. Again, it should be recognized that this operational proposal is still conceptual in nature. The numbers and dates should remain flexible so that refinements can be made in the future. Sincerely yours, a~~ Robert M. Weaver Attachments (2) cc: Jay W. Skinner Edmund H. Drager, Jr. William B. George Wayne B. Schroeder David E. Mott