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. . I,:' l"", r.. 0, HIGHLAND UNIT' Features of the potential Highland Unit are located in Holt, Antelope, Madison, and Platte Counties. The 50,500 Irrigable acres planned for service are located in Platte. Madison, and Antelope Counties. The Elkhorn Val ley Water Resources Association has shown an interest in the development of this multi-purpose project. The U. S. Bureau of Reclamation is planning this project. Current Status A favorable reconnaissance report has been prepared and feasibi lity studies have been authorized by the Congress. Before further steps toward construction can be taken, funds must be appropriated for the feasibi llty study of this project. Description of Proiect Area The project area I ies within the loess hi I Is and the sandhi I Is regions. Rainfal I averages 26 inches annually with about 19 to 20 inches occurring in the period of Apr! I through September. The economy of the area is agriculturally basedl with considerable I ivestock feeding practiced. Most business activity stems from the processing and sale of farm products and associated retai I trade. Manufacturing Is a minor business activity in the area. Extent of Proiect Investiqations During the late 1940's and early 1950's, the irrigation potential of this area was studied by the Bureau of Rec 1 amat i on. In Apr i I of 1965, the Bureau canp I eted and issued a reconna i ssance report on this area. Plan Features Three diversion dams, one on the Elkhorn River near Inman, one on the South Fork near Ewing, and one on the Elkhorn River near Ti Iden, a feeder canal, an ottstream dam and reservoir system and a canal and lateral system comprise the primary features of this potential project. The two upper diversion dams, near Inman and Ewing, would divert flows of the Elkhorn River and South Fork into the feeder canal for storage in Saint Clair Reservoir. The third diversion dam would divert flows of the Elkhorn River to be used on 7,500 acres of val ley lands and additional flows to be pumped into Saint Clair Reservoir for storage. The Saint Clair Reservoir would be created by a series of four dams on Cedar, Saint Clair, and two unnamed creeks. The four impoundments would be interconnected by excavated channels and operate as a single reservoir. The top of the conservation pool would have a water surface area of about 91600 acres and the total reservoir capacity would be 310,000 acre-feet. A single spi I Iway, located on Cedar Creek, would be an uncontrol led morning glory type with a maximum capacity of 1.760 c.f.s. The river outlet works would have a capacity of 250 c.f.s. An outlet works tor the Humphrey Canal would be located in a dike section along the east side of the reservoir and have a discharge capacity of 770 c.f.s. The Inman Diversion Dam located on the Elkhorn River approximaTely one-half mi Ie norTheast of Inman. would have the capacity to divert 400 c.f.s. to The Saint Clair Feeder Canal. The Holt Diversion Dam, located on the South Fork Elkhorn River approximately three mi les west of Ewing, would have the capaciTY to divert 200 c.f.s. TO the Saint Clair Feeder Canal. The Ti Iden Diversion Dam would be on the Elkhorn River about three mi les eaST of Oakdale. The diversion works would consiST ot a 370 c.f.s. headworks for diverting river flows to The Ti Iden Canal and the Oakdale Pumping Plant. The Oakdale Pumping Plant would be located approximately two mi les southeast of the Ti Iden Diversion works. This pumping plant would be designed to pump 250 c.t.s. against a Total dynamic head of about 194 feet into the SainT Clair Reservoir. The Saint Clair Feeder Canal would be about 40 mi les in lengTh and would originaTe aT the canal oUTlet works of the Inman Diversion Works. It would have a capacity of 400 c.t.s. from its origin to the Holt Diversion Works, where The capacity would increase to 600 c.t.s. , For information write: llUpper Basin, EI khorn Division, Nebraska", Vol. 1, Apri 1 1965. Area Englneerl Bureau of Reclamation. Grand Island, Nebraska. 2-5