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" " .. UNITED STATES DEPARTMENT OF THE INTERIOR BUREAU OF RECLAMATION Washington 25, D.C. Jan 18, 1960 105 To: Secretary of the Interior From: Commissioner, Bureau of Reclamation Subject: Principles to Govern, and Operating Criteria for, Filling Glen Canyon, Flaming Gorge, Navajo and Curecanti Reservoirs. Historical During the stages of formulating the planning report for the Colorado River Storage Project and Participating Projects (House Doc. 364, 83rd Cong., 2nd Sess.), it was recognized that special consideration would need to be given to ways and means of accumulat- ing storage in the reservoirs which were contemplated for authoriza- tion and construction. That these were matters for special consid- eration was pointed out to the committees of the Congress during the extensive hearings leading to authorization of the project. Refer- ences to the filling period may be found on pages 73, 160,163, and 164 of House Doc. 364, 83rd Cong., 2nd Sess. The Congress, by Public Law 485, 84th Congress, 2nd Sess., authorized the Colorado River Storage Project and Participating Proj- ects. In so doing, it excluded the Echo Park Unit (consisting of Echo Park Dam and Split Mountain Dam) and included the Flaming Gorge, Navajo, and Curecanti units in the initial stage. As a result of this change and because it was felt that administrative people and the Congress were entitled to a reappraisal of the project, the Bureau undertook an economic and financial analysis of the storage project as it had been authorized. This analysis was presented to the Con- gress and was published as Senate Document 101, 85th Cong., 2nd Sess. In order to make such an analysis, it was necessary that there be assumed certain procedures under which storage would be accumulated in the reservoirs. For this purpose there was prepared what has subsequently become known as the "Hydrologic Bases". At about this time, there had been indicated widespread in- terest in the problem of initial filling of the Glen Canyon reservoir. As a result, a meeting was held in Washington, D. C., on October 24, 1957. The Governors or their representatives and other interested persons from the seven states of the basin attended that meeting. At that meeting the statement on "Hydrologic Bases" was presented to the assembled group. That statement was subsequently revised in certain aspects and, as revised, became a part of Senate Document 77, 85th ~ I i '4 ;4 ~ }~ ~ ;~ ',~'; !~1' I" :~.~ L~' ~,: ;" ~ ~':J. L.- ~.:t '" ;'J, ~~ r<~ l;~ ~ft..;i,'~.: :.V1 ..J, ; " I la.-" T~" :,>( :>:';" .