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<br />Colorado River Basin Precipitation Management proposal. The Upper Colorado <br />Region Comprehensive Framework Study describes the area as follows: <br /> <br />liThe main tributary of the Colorado River in the subregion is the <br />San Juan River, second largest tributary in the Colorado system. <br />The San Juan heads on the western slope of the Continental Divide <br />in southwestern Colorado and enters the main stream about 80 miles <br />upstream from Lee Ferry. Three small rivers, Dirty Devil, Escalante, <br />and Paria, drain the eastern side of the Wasatch Plateau in Utah <br />and join the Colorado from the west. <br /> <br />liThe 1 argest towns of the subregion are Durango and Cortez in <br />Colorado, Monticello and Blanding in Utah, and Farmington in <br />New Mexico. Page at Glen Canyon Dam is the only community of <br />significant size in the Arizona portion of the subregion. Most <br />of the remaining Arizona portion is in the Navajo Indian <br />Reservation. <br /> <br />liThe subregion is served by U.S. Highways 84, 89, 160, 164, 550, <br />and 666 and by an extensive system of State highways and secondary <br />roads. The subregion has no interstate highways at present, but <br />Interstate 70 when completed will traverse the headwaters of the <br />Dirty Devil River. Service by the narrow-gage branch line of the <br />Denver & Rio Grande Western Railroad in the eastern part of the <br />subregion in Colorado and New Mexico has now been largely <br />discontinued. <br /> <br />"Mining and agriculture form the economic base for the San Juan- <br />Colorado Subregion. The agricultural development is similar to <br />12 <br />