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Flows in Colorado River will be depleted in future years by irrigation developments in the Upper Basin states, and the output of hydroelectric plants will decrease. This raises a problem as to the most economic installation for each project. Estimates are being made of the potential average energy output at each site for a 50-year period beginning 1970, and the installation neces- sary to generate this amount of energy. Costs of developing the average out- puts, plus costs of transmission to load centers, will be related to costs of equivalent outputs by steam-electric plants at load centers. Costs of adding increment~l peaking capacity will be compared with costs of peaking capacity in other hydro or in steam-electric plants. Peaking capacities required will be assigned to the most economic sites. At least four potential power projects in the Colorado River Basin would affect national monuments or parks. Echo Park Reservoir would flood part of Dinosaur National Monument. There is opposition to this Project, although many believe that construction of the reservoir will greatly enhance the use of this scenic area. A 90,000-kilowatt plant with about 1070.foot head could be constructed on the Gunnison River but it would necessitate di. version of almost the entire flow of the river around Black Canyon National Monument. The New Moab Project on the Colorado River would flood part of Arches National Monument. Marble Canyon-Kanab Project would divert a major portion of Colorado River around Grand Canyon National Park. The power in- volved is approximately 1,100,000 kilowatts, with annual value over $30,000,000. To many, interference with a national monument or park is sacrilege. However, power is so basic to our economic system and standard of living that projects which affect parks should be evaluated on their merits in order that people be informed of the magnitude of the resource and the cost of allowing it to lie unused. Then all agencies, whether concerned with power, irriga- tion, or recreational resources should abide by the people's decision. Power problems of the Basin, though complicated and difficult, are not insurmountable. The interests of both the Upper and Lower Basins lie in seeing that projects are developed in an orderly manner at the lowest possible cost, and the power fUlly marketed as each project is completed. Just apprai- sal of the needs of eacll area and cooperation by all will lead to earliest accomplishment of the desired objectives. *********** RECENT DEVELOPMENTS IN COLORADO RIVER UNDER THE JURISDICTION OF THE INTERNATIONAL BOUNDARY AND WATER COMMISSION J. F. Friedkin, Resident Engineer, United States Section, International Boundary and Water Commission, San Diego, Calif. Provisions of the 1944 Treaty which relate to the delivery of waters of the Colorado River to Mexico became operative on November 8, 1950, five years from the date of entry into force of the Treaty, as provided in Article 27. Thus, Colorado River waters have been delivered pursuant to the terms of the Treaty for more than a year. The two structures which the Governments of the United States and Mexico agreed to construct within the 5.year period were placed in operation on November 8, 1950. Davis Dam is operated for, among .27.