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<br />001962 <br /> <br />3. DESCRIPTION OF THE ENVIRONMENT AND ENVIRONMENTAL <br />CONSEQUENCES <br /> <br />3.1 Project General Description <br /> <br />The Mancos Project in the southwest corner of Colorado consists of the Jackson Gulch Dam and <br />Reservoir, the Inlet Canal, and the Outlet Canal. Project lands extend downstream about 10 <br />miles. The project can furnish a supplemental water supply to 13,746 acres for irrigation <br />purposes. <br /> <br />The off stream reservoir is fed by the 2.6-mile-Iong Inlet Canal from the West Mancos River. <br />Water from the reservoir is returned to the original streambed at a point higher than the project <br />lands through the 2.2-mile-Iong Outlet Canal. The greater part of the distribution system was <br />constructed by local interests prior to 1900. Facilities constructed by the Bureau ()f.Reylamation <br />furnish supplemental water to an established agricultural area and provide a domestic water <br />supply for Mesa Verde National Park, Mancos Rural W~ter Co., and the town of Mancos. <br /> <br />Jackson Gulch Dam is a rock-faced earth fill structure 180 feet high with a concrete cutoff wall. <br />The reservoir is off-stream on Jackson Gulch, 5 miles north of Mancos, a,nd has a total capacity <br />of almost 10,000 acre-feet. The dam does not have a spillway. The 280-cubic-foot-per-second- <br />capacity outlet works is a concrete pressure conduit from!.rash rac.l<.to gate chamber, and a steel <br />pipe from gate chamber to two hollow jet valves, The InletCanal extends from the West Mancos <br />River to the reservoir. <br /> <br />3.1.1 Properties tQbeIrrigated with Non-Project Contract Water <br /> <br />1. The Marilyn Colyer property is located approximately 2/3 of a mile SE of Jackson Gulch <br />Dam. It isa221acre(ac) parcel, composed of primarily cleared agricultural lands. <br />2. The Glen Spencer Property is located approximately 9/10 of a mile south of Jackson Gulch <br />Dam. Itis a 120 ac parcel, composed of primarily cleared agricultural lands. <br />3. the Ralpl1 and Dixie Robbins prog~rty is located approximately 2 miles south-southeast of <br />Jackson Gulch Dam. It is a 1~0 ac parcel, composed of primarily cleared agricultural lands. <br /> <br />3.1.2 Non-ProjectContractWater <br /> <br />1. The Colyer water--1i2cfs from the Mancos River for a period of 1 month (mid May-Mid <br />June), with a maximum diversion not to exceed 30 af; decreed in 1893 with an appropriated <br />date of 1889, <br />2. The Spencer Water--1.0 cfs from the Mancos River for a period of 1 month (mid May-Mid <br />June), with a maximum diversion not to exceed 60 af; decreed in 1893 with an appropriated date <br />of 1889. <br />3. The Robbins water--2.52cfs from the Mancos River for a period of 75 days (mid May-late <br />July), with a maximum diversion not to exceed 375 af; decreed in 1893 with an appropriated date <br />of 1877. <br /> <br />11 <br />