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<br />nQ157l <br /> <br />I I I , NA1URAL RE9JURCES (f 11f PASIN 11 <br /> <br />LOCATION AND SIZE <br /> <br />The San Juan 'River Basin is located in the Four Corners area of <br />Arizona, Colorado, New Mexico and Utah. It includes B percent <br />of New Mexico, 5.5 percent of Colorado, 5.1 percent of Utah, and <br />4.5 percent of Arizona. The basin extends approximately 250 <br />miles east and west, and 160 miles north and south. It is entirely <br />within the Upper Colorado Region and drains an area of 24,945 <br />square miles (15,965,200 acres) or about one-fourth of this region. <br /> <br />The New Mexico portion comprises 39 percent of the basin and in- <br />cludes nearly all of San Juan County and parts of Rio Arriba, <br />Sandoval, and McKinley counties. <br /> <br />Slightly more than 23 percent of the basin is within Colorado. In- <br />cluded are La Plata, most of Archuleta, Montezuma and San Juan, <br />and parts of Dolores, Hinsdale and Mineral counties. Very small <br />areas of San Miguel, Rio Grande, and Conejos counties are also <br />included in the basin. <br /> <br />Arizona has a little over 20 percent of the area of the basin <br />which consists of parts of Apache, NavajO and Coconino counties. <br />The remaining portion of the basin (about 17 percent) is in San <br />Juan county, Utah. The northern and northwestern boundary of the <br />basin is defined by the Gunnison, Dolores, and Colorado River <br />divides. The eastern and southeastern boundary follows the Con- <br />tinental Divide. The southern and southwestern boundary is the <br />divide of the East and West Puercos and the Little Colorado <br />Rivers. The extreme western boundary is the divide of the <br />Colorado River. <br /> <br />11 Modified from the Uppe~ Colorado Region Comprehensive Framework <br />Study, Appendix VI. <br /> <br />III-l <br />