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<br />002332 <br /> <br />CHAPTER III <br /> <br />PROJECT DEVELOPHENT <br />(Great Northern unit) <br /> <br />. <br /> <br />Great Northern Unit <br /> <br />The Great Northern unit is a potential irrigation development for <br />lands situated north of the Yampa River, primarily between Elkhead and <br />Fortification Creeks. The unit as presently planned would provide water <br />for 10,660 acres of land, including 8,070 acres of full service land and <br />2,590 acres of supplemental service land. It is also expected to provide <br />some incidental benefits to fish and wildlife conservation, recreation, <br />and sediment control. Some lands near Craig that presently receive water <br />from Fortification Creek could be supplied supplemental water from the <br />return flow of unit lands. These lands are not included in the plan <br />analyzed in this report but could be added to the plan in fUture <br />investigations. <br /> <br />Unit plan <br /> <br />. <br /> <br />Water for the Great Northern unit would be obtained from Elkhead <br />Creek and its North Fork. The Elkhead Creek 'Water, consisting of excess <br />winter and spring flows, would be regulated on the stream at the potential <br />California Parle Reservoir. As needed for irrigation, the reservoir water <br />would be released to the stream channel and then distributed to unit lands <br />by the potential Elkbead Canal and smaller existing ditches. The natural <br />flow of the North Fork of Elkhead Creek would be intercepted by a short <br />feeder canal and conveyed to the Elkbead Canal for distribution to unit <br />lands. The Elkbead Canal would extend westward from its point of diver- <br />sion to the low divide between Elkhead and Fortification Creeks and then <br />would continue southwest along the top of the divide, serving lands on both <br />sides. One main lateral would extend northwesterly to serve lands situ- <br />ated north of the Dry Fork of Little Bear Creek. <br /> <br />Laterals would be provided for distribution of water to the full <br />service lands. Existing ditches for the supplemental service lands are <br />adequate for unit development. Some of the existing ditches would need <br />to be enlarged and extended, however, to serve the new lands situated <br />along Elkhead Creek. No drainage problems a1" anticipated with irrigation <br />development. <br /> <br />Design and constIUction <br /> <br />California Park Reservoir <br /> <br />. <br /> <br />California Park Reservoir on Elkhead Creek would have a capacity of <br />~6,000 acre-feet, including ~5,OOO acre-feet of active capacity, Boo acre- <br />feet of dead storage, and 200 acre-feet for storage of sediment. The <br />reservoir would have a nonnal "ater surface elevation of 7 ,B91 feet and <br />a dead storage elevation of 7,B10 feet. The dam fonning the reservoir <br />would be a rolled earth-fill structure 101 feet in height above streambed <br />and 1,480 feet long at the crest. The outlet works, With a capacity of <br />190 second-feet, "ould be a concrete-lined conduit through the dam. A <br />spillway, ,lith a p.ap"-"1.ty 0:1' 5,000 "ecDnd-f'p.et., would be provided on the <br />right abutment. <br /> <br />55 <br />