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I I I I I I I I I I I I I ,. I I I I I I I ~ nOB ]4 Water is exported from the basin for use in the Rio Grande River Basin in Colorado. The Treasure Pass Ditch intercepts the runoff of tributaries of Wolf Creek near Wolf Creek Pass at an elevation of 10,900 feet and conveys the water to a tributary of the South Fork of the Rio Grande River. The estimated stream depletion of the Upper San Juan Division is given in Table VI, TABLE VI Average annual stream depletion by irrigation.... 7,400 Acre Feet Average annual stream depletion by exportation. .. 100 II II Average annual stream depletion by reservoir evaporation..... .................,....,..". Average annual stream depletion by municipal use. 200 100 II II II " Total 7,800 Acre Feet Potential Water Use A reconnaissance study of potential expanded use of water for irrigation purposes indicates that cost considerations will likely limit new irrigation to direct flow water use similar to the development of past years. An engineering survey has been run for a canal heading on the West Fork of the San Juan River at elevation of 7,650 feet and terminating at Fourmile Creek. The survey shows a canal nineteen miles in length will deliver West Fork water to Fourmile Creek. The water would be used for expanded irrigation on lands under the Fourmile Creek canals and to replace Fourmile Creek water for use on higher areas and on lands located west of Fourmile Creek in the drainage basin of Stollsteimer Creek. Arable lands potentially serviceable by the canal exceeds the basic summer direct flow of the West Fork. Records of flow of the West Fork show a canal of capacity of about 70 cfs could be justified and would provide water for 3,000 acres of land, This -11- h_