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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 /> <br /> <br />rnn 8 Q2 <br /> <br />UPPER SAN JUAN DIVISION <br /> <br />Location and Description <br /> <br /> <br />The Upper San Juan Division consists of the drainage basin of the San <br /> <br /> <br />Juan River and its tributaries above the junction of Echo Creek. The tribu- <br /> <br /> <br />taries include Mill Creek, East Fork San Juan River, Wolf Creek, West Fork <br /> <br /> <br />San Juan River, Turkey Creek, Fourmile Creek and McCabe Creek. <br /> <br /> <br />The river and principal tributaries originate on the western slope of <br /> <br /> <br />the Continental Divide in Mineral and Archuleta Counties, Colorado. Water- <br /> <br /> <br />shed peaks extend to elevations in excess of 13,000 feet. The main river <br /> <br /> <br />runs in a general southwesterly direction in Colorado and enters New Mexico <br /> <br /> <br />forty-five miles below Pagosa Springs. <br /> <br /> <br />The main river above Pagosa Springs and the tributaries East Fork, Wolf <br /> <br /> <br />Creek and West Fork carry a surplus of water all seasons of the year. The <br /> <br /> <br />discharge of Mill Creek, Turkey Creek, Fourmile Creek and McCabe Creek is <br /> <br /> <br />fully used for irrigation during the summer months. Reservoir development <br /> <br /> <br />for the storage of water for expansion of irrigation has generally proved <br /> <br /> <br />uneconomic, The runoff of the main river at Pagosa Springs is fully used <br /> <br /> <br />during the low flow months of the year for the generation of electrical <br /> <br /> <br />energy, <br /> <br />Water Runoff <br />Data on the annual runoff of the San Juan River at Pagosa Springs is <br />given in Table V, <br /> <br />-9- <br />