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. o 00 IV W . . INTRODUCTION (Continued) (376 U.S. 3"0), the Boulder Canyon Project Act ("5 Sta t. 1057), the Boulder Canyon Project Adjustment Act (54 Stat. 774; 43 U.S.C. 618a), the Colorado River Storage Project Act, (70 Stat. 105; 43 U.S.C. 620), or the Colorado River Basin Project Act (82 Stat. 885; 43 U.S.C. 1501). B. Previous Reports A series of eight reports starting with the 1963 edition have been prepared prior to this report. Each succeeding report updated the pre- vious report and added changes which occurred within the 2-year interval. In addition to including 2 more years of record, the major changes in this report from the January 1977 report are as follows: (1) transferring that part of the future estimated depletions that actually occurred during the 2 years to present depletions; (2) updating Part VIII "Colorado River Salinity Control Program" in order to report on the progress of investigations, planning, and construction of salinity control units as required under Title II Section 206 of the Colorado River Basin Salinity Control Act, Public Law 93-320; (3) updating the depletion schedule for future conditions, such as deleting the Savory- Pot Hook and Fruitland Mesa Projects as well as making other changes, (note; the Frui tland Mesa and Savery-Pot Hook Proj ects have not been de-authorized and therefore left on the map but were not included in the computations) and (") adding three more stations, the Yampa River near Maybell, Colorado, the Whi te River nea r Watson, Utah, and the Dolores River near Cisco, Utah. C. Cooperation The major portion of this report was prepared by the Bureau of Reclamation. The Geological Survey provided most of the basic data. It also prepared a technical study on salinity in the Flaming Gorge Reservoir and a ~tudy of the geologic factors that affect salinity in the Upper Colorado River Basin. A continuing cooperative program be- tween the Bureau of Reclama t ion and the Survey for the collection of streamflow quality data and the exchange of information has been in effect for a number of years. This cooperation provides for the collec- tion of data at stations other than basic data stations maintained by the Geological Survey in order to obtain additional data at key points in the basin. In the Upper Basin, data are obtained at various points along the river and in drains cooperatively with the Geological Survey and other agencies, Along the main stem below Lees Ferry, data are obtained on a regular basis at a network of stations that includes essentially all significant diversions, surface retnrn flows, and major river stations. The Burean of Reclamation is the lead agency of an ongoing task force 5