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L <br />' Land Use <br />' than this does not provide sufficient income to be self support <br />ing, nor year around full time employment for the operator. To <br />maintain a herd of 2�10 breeding cows through the winter requires <br />' approximately 400 tons of hay, which can be raised on 175 acres <br />of adequately irrigated land. In addition to irrigated land to <br />' produce winter feed, an economic unit requires some 600 to 800 <br />acres of deede_' grazing land and/or federal use permits to graze <br />' on public lands. <br />' <br />1 <br />, <br />1 <br />' <br />' <br />1 <br />� <br />1 <br />Land Classification <br />The lands within the irrgation service area were partially <br />classified in 1934 and 1935 by the Bureau of Reclamation as a <br />part of the Colorado River Basin studies. This investigation has <br />been referred to as the "Preston Survey". This survey resulted <br />in the New Arable Lands being classified as Classes 1 and 2 only. <br />The then irrigated lands cvere not classified. A second detailed <br />investigation by the Bureau of Reclamation was undertaken in 1936, <br />the results of which were published in a report issued in 1937. <br />Included in this investigation was topographic mapping of three <br />reservoir dam sites (including the Yamcolo site) and test pits <br />at the project site. 5,000 additional acres were classified <br />durinq this investigation to supplement the earlier bureau report. <br />A more recent survey was initiated by the Bureau of Reclamation <br />in 1951, the results of which were published in 195h under the <br />heading of "Cliffs-Divide Project, Colorado-Status Report". <br />The land classification standards used in the 1937 Yampa <br />Report are shown on Table 5 and those used in the Cliff-Divide <br />Report are shown on Table 6. <br />' <br />, <br />I ' <br />1 <br />III - 7 <br />