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<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 />I <br />I <br /> <br />ar>324'1 <br />"u <br /> <br />PIEDRA DIVISION <br /> <br />~ocation and Description <br /> <br /> <br />The Piedra Division is the watershed basin of the Piedra River. The <br /> <br /> <br />river originates on the south slope of the San Juan Range in Mineral and <br /> <br /> <br />Hinsdale Counties, Colorado. Watershed peaks rise to elevations of over <br /> <br /> <br />12,500 feet. The river runs in a southwesterly direction and joins the <br /> <br /> <br />Sen J'uan two miles upstream from thE) Colorado-New Mexico State line. <br /> <br /> <br />The Piedra, and tributaries Middle Fork, Williams Creek, Weminuche <br /> <br /> <br />Creek and Sand Creek are uncontrolled streams and carry a surplus of water <br /> <br /> <br />all seasons of the year. Other tributaries, Pagosa Creek, Devil Creek and <br /> <br /> <br />St':lllsteimer Creek are fully used for irrigation and serve only a portion <br /> <br /> <br />of available arable land. <br /> <br /> <br />The flow of Devil Creek and Stoll steimer Creek are fully used for <br /> <br /> <br />irrigation in average years. The irrigation is concentrated in an upper <br /> <br /> <br />valley with elevations of 7,000 to 8,000 feet and a lower valley of river <br /> <br /> <br />bottom land with elevations of 6,000 to 6,300 feet. Crops in the upper <br /> <br /> <br />valley are limited to grass hay and livestock pasture. Crops grown in the <br /> <br /> <br />lower valley are alfalfa, livestock feeds and grain. <br /> <br />Water Runoff <br /> <br /> <br />Data on the annual runoff of main Piedra River, Middle Fork and <br /> <br /> <br />Pagosa Creek upstream from irrigation diversions are given in the following <br /> <br /> <br />Table XI. <br /> <br />-18- <br /> <br />cl. <br />