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<br />I~ <br />r.,C) <br />N <br />r::> <br /> <br />CHAPTER II <br /> <br />UNIT SETTING <br /> <br />relatively constant level. The production of feed crops has increased in <br /> <br />recent years, while orchard acreages have decl ined about 24 percent. <br /> <br />Cultural Resources <br /> <br />Potential construction material sites identified for the Grand <br /> <br />Valley Unit were surveyed by the Historical Museum and Institute of <br /> <br />Western Colorado in 1975 and by Reclamation in 1981; no cultural re- <br /> <br />sources were located in either survey. <br /> <br />None of the valley's canal or lateral features have been nominated <br /> <br />to the National Register of Historic Places; however, the Colorado State <br /> <br />Historic Preservation Officer has indicated that it is likely the Grand <br /> <br />Valley Diversion Dam may meet the Register's eligibility criteria because <br /> <br />of its design and role in the agricultural development of the Grand <br /> <br />Valley (Colorado State Historic Preservation Office letter, 1978). In <br /> <br />addition, the canals or the canal system may be eligible for inclusion <br /> <br />because they are also an essential part of the development of the Grand <br /> <br />Valley. <br /> <br />A complete cultural resource survey of the Stage Two area is being <br /> <br />conducted under contract with Colorado State University; however, based <br /> <br />on existing information, it is anticipated that any impacts to cultural <br /> <br />resources resulting from Stage Two development could be mitigated. <br /> <br />f <br /> <br />Irrigation Delivery Systems <br /> <br />The irrigation delivery systems for the Grand Valley consist of both <br /> <br />private and Federal developments as shown on the frontispiece map. The <br /> <br />private portion was essentially all constructed prior to 1910 and con- <br /> <br />sists of the facilities of the Grand Valley Irrigation Company, the <br /> <br />12 <br />