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<br />. <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />II <br />l <br /> <br />nn3Z28 <br /> <br />The area of the drainage basin is 25,230 square miles. Of this <br /> <br /> <br />5,889 square miles, or 23.3%, is in Colorado; 9,646 square miles, or <br /> <br /> <br />38.3%, is in New Mexico; 5,222 square miles, or 20.7%, is in Arizona; <br /> <br /> <br />and 4,473 square miles, or 17.7% is in Utah. <br /> <br /> <br />River runoff largely originates in Colorado, on the western slope <br /> <br /> <br />of the Continental Divide and the southern slope of the San Juan Range. <br /> <br /> <br />The watershed in the other three states contributes very little water <br /> <br /> <br />to the flow of the river. The two mountain ranges in the Colorado portion <br /> <br /> <br />of the watershed have over thirty peaks with elevations in excess of <br /> <br /> <br />13,000 feet. A major portion of the watershed area of the other three <br /> <br /> <br />states is below an elevation of 6,500 feet. This area has very low <br /> <br /> <br />precipitation. <br /> <br />Basin Runoff <br /> <br /> <br />Stream flow information on the San Juan River at its junction with <br /> <br /> <br />the Colorado is unavailable. The river is gaged near Bluff, Utah, 140 <br /> <br /> <br />miles upstream from this junction and 220 miles upstream from river <br /> <br /> <br />compact point, Lee Ferry, Arizona. Below the Bluff station river losses <br /> <br /> <br />exceed inflow. <br /> <br /> <br />Data on annual runoff of the San Juan River at the Bluff, Utah, <br /> <br /> <br />station and the runoff of the Colorado River at Lee Ferry are presented <br /> <br /> <br />in the following Table I: <br /> <br />-2- <br /> <br />LH <br />