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002288' . users. It cannot be justif':..ed f'or :further study, however, until large- scale oil shale development in the Rifle-De Beque area becomes imminent. Of the irrigation developments, the Two Bar unit has the hichest indicated benefit-cost ratio (1.6:1), the highest percentage of construc- tion costs payable by the water users (22 percent), and the lowest con- struction cost per acre of' f'ull service land or equivalent ($340). There- f'ore it appears to be the logical irrigation development in the area to be considered for detailed study. Further consideration of the unit, however, should depend on decisions yet to be made with respect to the potential Lily Park and Cross Mountain po-wer develol'ments on the Yampa River and with respect to upstream development of' the potential Savery-Pot Hook irriga- tion project. Much of the land of the Two Bar unit would be inundated if' the Lily Park Reservoir site were developed f'or power purposes. Also the unit as reported is dependent on construction of the potential Cross MOun- tain power development and the upstream Savery-Pot Hook irrigation project. . Next to the Two Bar unit, the JWliper appears to be the most likely irrigation unit of the Yampa-White project to be chosen for :further study. This cr.oice is indicated by the unit's estimated benefit-cost ratio (1.4:1) ~nd the ~ercentage of' its construction cost repayable by the irri- gation WEter use~s (21 percent). Appraisal of' the Juniper Wlit solely f'or irrigation use, however, as outlined in the accomp~ying report was made largely as a base for fUrther studies of hydroelectric power possibilities at the Jlmiper Reservoir site. Theref'ore, despite its apparent economic justif'iatility, the unit should not be further studied as en irrigation project until the Juniper power development bas been investigated. Desir- able correlatiuns also should be made with the potel'.tial Cross /I-::mntain development. The Cross Mountain site could be developed to replace or to supplement the Juniper Reservoir both f'or irrigation and generation of hydroelectric power. With use of the Cross Mountain site some of the lands now included in the Juniper unit would be inundated. The Ha;yilen Mesa, Wessels, Great Northern, and Yellow Jacket units ac planned in this report have relatively low benefit-cost ratios (approx- ilJe.tely pni ty), and they can pay little or nothing towards construction costs. For these reasons :further investigation of these units is not con- Sidered justified at this time. . The water use plans presented were formulated largely with a vipw to,rard outlinine the maximum physical irri~tion potential that could be economically justified rather than the scale of optimum economic devel- opment. This is consistent with studies made in other parts of the Upper Colorado River Basin to establish an inventory of potential projects fer more deteiled investigation or for elimination from further consideration at this tine. As detailed investigations are undertaken, it will no doubt be fOWld desirable to modify the scale of some of the unit p~ans to pro- vide the greatest degree of economic justification in the light of new -information and under economic conditions then prevailinG_ 2