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Rivers. The treaty Senate on April 18, vember 8, 1945. B. Interstate compacts was ratified by the United States 1945, and became effective on No- 1. Colorado River Compact, 1922, sections 37-61-101 to 104, C.R.S. 1973). This compact covers the Colorado River and all its tributaries within the United States. It binds the States of Wyoming, Utah, Colorado, New Mexico, Arizona, Nevada and California. The com- pact divides the river system into the "Upper Basin" and "Lower Basin." The "Upper Basin" means those parts of Wyoming, Utah, Colorado, Arizona and New Mexico within and from which waters naturally drain into the Colorado River system above Lee's Ferry, Arizona (located just below Glen Canyon Dam near Page, Arizona).115/ Conversely, the "Lower Basin"116/ includes those parts of New Mexico, Arizona, Utah, Nevada and California from and within which waters naturally drain into the Colorado River system below Lee's Ferry. The compact apportions the available flows between the upper and lower basins. Each basin is entitled to the exclusive beneficial consumptive use of 7,500,000 acre-feet of water per annum. In addition, the lower basin is given the right to increase its ben- eficial consumptive use of water by an additional one million acre-feet per year. Lee's Ferry is the dividing point. The upper basin states are required to deliver 75,000,000 acre-feet of water for any period of 10 consecutive years reckoned in a continuing progressive se- ries. The delivery must be made at Lee's Ferry. The delivery requirement has the effect of requiring the upper basin to guar- antee the performance of the river for the lower basin. Thus, in years of low flows, the upper basin will have to greatly reduce its consumptive use of water to insure deliveries to the lower basin. This requirement increases the need for upstream storage in the upper basin. Such storage would allow the upper basin to store water in years of high flows to be used in later years of low flows. 2. Upper Colorado River Compact, 1948, sections 37-62- 101 to 106, C.R.S. (1973). This compact is among the states of the "Upper Basin." It is de- signed to allocate the water available to the "Upper Basin" under -19-