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~ r Cong., 2nd Session. Also at that meeting representatives of Arizona, California, and Nevada offered for consideration the so-called Tri- State Criteria. These criteria, with a slight modification, were published as Senate Document 96, 85th Cong., 2nd Sess. A second meeting was held on December 4 and 5, 1957, in Las Vegas, Nevada. This meeting was also attended by the Governors or, in some cases, their representatives and others from the seven states. At that meeting the Interior Department offered to meet with any of the states singly or jointly upon their request. Subsequent to that meeting there was established a group of engineers represent- ing the States of Arizona, California, Nevada, and the Bureau of Reclamation. This group was to provide additional information of an engineering nature aimed specifically at the filling problem. This engineering group met on the following dates in 1958: February 3 and 4 April 17 and 18 June 25 and 26 September 23 and 24 December 8 and 9 . ~; " The group met on March 4 and 5 in 1959, and also met with the Upper Basin Engineers on March 30 and 31 and August 4, 5 and 6, 1959. During this period the group prepared more than 200 pre- liminary studies, some by manual process and others by electronic digital computers. These studies were exploratory and, among other things, provided a general framework for the studies subsequently made. An additional 65 operational studies have also been made covering three assumptions of runoff sequence for a 36-year period and eight general sets of filling criteria. A summary, in report form, of the work of this group was transmitted to you by letter of August 20, 1959, signed by A. J. Shaver for the Lower Basin Engineer- ing Group. c' By letter of August 27, 1958, the engineering committee of the Upper Colorado River Commission requested that the Department appoint a group of engineers to meet with the committee also for consideration of possible filling criteria. The same Bureau of Reclamation engineers met with the Commission's committee. One meeting on November 6, 1958, was held. The Commission's engineering committee subsequently thereto and independently made a large number of operating studies. The summary of its work, in report form, was transmitted to Assistant Secretary Aandahl by letter of September 22, 1959, signed by Ival V. Goslin, Chairman, Engineering Committee, Upper Colorado River Commission. ~~. ~ ,; :~ In addition to the foregoing reports, the State of Colorado transmitted a report entitled "Future Operation of Glen Canyon Res- ervoir, as Related to the Colorado River Compact", which reported 2