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<br />1100 <br /> <br />1050 <br /> <br /> <br />A. <br /> <br />350 <br /> <br /> <br />EXPLANATION <br /> <br />_ GRAND CANYON <br />NATIONAL PARK <br />- -- - BOUNDARY OF <br />COLORADO RIVER <br />DRAINAGE BASIN <br /> <br />-.. - BOUNDARY BETWEEN <br />THE UPPER AND LOWER <br />BASINS <br />... USGS GAGING STATION <br />WITH STATION NUMBER <br /> <br />.,\ <br />IDAHO I ,J . <br />: \ WYOMING <br />... . <br />- ~~ 1 ~ t.._. <br />I' . <br />Lake I\. <br />City w.- - - <br />o <br /> <br />\ <br /> <br />400 <br /> <br />NEVADA <br /> <br />, <br />, <br /> <br />'" <br /> <br />, <br /> <br />~ <br />. <br />. <br />t--LOWER BASIN <br />., <br />) <br />( <br /> <br />---- <br /> <br />-0 <br />7'0 <br />0;:<, <br />"0 <br />o <br />~ <br />'?z. <br /> <br /> <br />MEXICO <br /> <br />o <br />I <br />o <br /> <br />I <br />100 <br /> <br />100 <br />I <br />I <br />200 <br /> <br />'" <br />, <br />200 MILES \ <br />I <br />KILOMETERS <br /> <br />.----.. <br /> <br />Base modified from Figure 1 in Smith and others (1960). <br /> <br />Figure 1. The Colorado River drainage basin and Lees Ferry. (A) The Colorado River Basin showing the location of Lees Ferry, Glen Canyon Dam, <br />and the lees Ferry and other U.S. Geological Survey gaging stations (with station numbers) used in this study. See table 1 for the official and <br />shortened names of these stations. <br /> <br />02250 <br /> <br />Introduction 3 <br />