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The Humphrey Canal, originating at the canal outlet works of Saint Clair Reservoir, would be about 54 mi les long and would serve about 48,000 Irrigable acres. Its capacity would range from 4 to 700 c.f.s. The Tilden Canal, beginning at a turnout from a settling basin below the Tilden Diversion Works, would extend about 24 mi les and supply water for 7,500 irrigable acres. Its capacity would range from 18 to 120 c.f.s. The laterals of the distribution system would have capacities of 4 to 100 c.f.s., with a combined length of about 250 miles. Several pumps would be included in the distribution system. . Proiect Benefits Direct benefits would be derived from this project for irrigation, recreation, flood control and fish and wi Idl Ife. Irrigation would be the primary purpose of this multi-purpose project, but recreation and fish and wi Idl ife benefits would be significant. The recreation, fish and wi Idl Ife features of this project would provide 422,000 recreation days and 60,000 fisherman days annually. The project would provide no dependable flood control benefits of consequence along the Elkhorn River because of the relatively sma I I drainage area to be con- trol led. Saint Clair Reservoir, however, would provide incidental flood control benefits to Oakdale and to the lands immediately below the structures. Remainlnq Water Resource Problems and Needs Exclusive of the Sandhi I Is area, flOOding has occurred In the basin with regularity. Limited local flood protection works have been provided for some communities, but extensive additional measures are necessary to reduce flood damages. Project Costs The total estimated cost of this project would be $69,304,000. The share assigned to irrigation would be $62,114,000 and that assigned to recreation and fish and wi Idl ife, $7,037,000. Flood control aspects of the project would involve an Initial cost of $153,000. Operation, Maintenance and Replacement Operation, maintenance and replacement of the Irrigation facilities would be the responsi- bl I Ity of a local sponsoring district. Operation, maintenance and replacement of recreation and fish and wi Idl Ife faci Ilties would be the responsibi lity of a non-federal entity. Local Interest and Support Because of the drought of the 1950's, a group of individuals In the Elkhorn River Val ley became interested In the Irrigation potential of the Upper Basin and formed the Elkhorn Val ley Water Resources Association. During the spring of 1961, the Association requested that the Nebraska Sol I and Water Conservation Commission coordinate planning activities for a basin-wide study of the sol I and water resource development potential of the whole Elkhorn Val ley. At the present time, no legal entity capable of sponsoring the non-federal obligations has been formed. Existlno Resource Development In the Area Present Irrigation development Is confined to pumpIng from wells and from the Elkhorn River and tributary streams. Effect on Water Supplv In Project Area Private and public domestic water requirements are adequately served by pumping from ground water aqu I fers. Pub I ic waste treatment faci I i ties are inadequate but are be I ng improved. This proposed project would deplete the total runoff in the area about 50 percent, but should not have any serious adverse effects on the water supply downstream from the Impoundment structures, with the exception of Immediately below the structures where conditions may adversely affect the fishery. . 2-6