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entire river have been utilized since the 1920's is found in the comprehensive factual report issued by the Bureau of Reclamation in 1946-47 which contains a description of the resources of the basin of the Colorado River, its needs and problems, and its development to that time and potential utilization. An important aspect of the post-World War I interest in the upper basin was the work of making a detailed survey of the Colorado River from Lees Ferry to the mouth of the Green River, including the San Juan River from its mouth to Chinle Creek, undertaken in 1921 by the Geological Survey in cooperation with the Southern California Edison Company of Los Angeles. The resultant map was printed in 1922 in 22 sheets (16 river plans, scale one inch-one-half mile, contour interval in the river five feet, contour interval on land 20 feet extending to the level of 3900 ft. above the sea) and six profiles, the first accurate map of the Colorado in the Glen Canyon region. Similar map series of the Colorado between the mouth of the Green and Grand Junction and of the Green from the mouth to Gunnison Butte (above Green River, Utah) had appeared in 1917. A note in passing; Colorado in March, 1921, changed by legislative action the name of the river above the mouth of the Green from the Grand River, a name originally bestowed by Spain, to the Colorado River, an action sustained by Congress in July, 1921. Still another aspect of the postwar interest in water development in Glen Canyon was action by the Director of the United States Geological Survey June 10, 1920, in withdrawing as a power site reserve the lands immediately adjacent to the Colorado River in Glen Canyon and those in San Juan Canyon from all type of private entry including that for mining purposes. This brought prospecting in the canyons to a near standstill, although the mining boom had passed before World War I. Before 1922 lower basin pressure for development of the Colorado River made it clear that proposals for use of the stream would exceed its potentiality. The upper basin states became alarmed that extended water use by the lower basin states would establish prior rights. There was the question of the right of individual states to regulate exclusively the flow of the river within individual boundaries and there was the possibility of over-all federal control of the river to facilitate its development. Gradually the idea of a compact between the states emerged as being essential to the full development of the Colorado: the lower basin needed the support of the upper basin in obtaining -69-Epson Perfection 4870 Photo, 400 dpi, 8 bit, 13,721,600 byte