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<br />. <br /> <br />. <br /> <br />. <br /> <br />002S3S <br /> <br />CHAPTER III <br /> <br />ProJECT DEVELOalErlT <br />(Great Northern unit) <br /> <br />Estimated costs--Great Northern unit <br /> <br />~/ Includes costs <br /> <br />Construc- <br />tion cost <br />$1,939,000 <br />1,323,000 <br />1,130,000 <br />10,000 <br />65,000 <br />4,467,000 <br />of diversion dams, feeder <br /> <br />Annual operation" <br />maintenance, and <br />replacement costs <br />$3,400 <br />12,800 <br />8,900 <br /> <br />Item <br />California ~~I7 Reservoir <br />El4lead Can 1 <br />Laterals <br />Past investigations <br />Future investie;ations <br />Total <br /> <br />25,100 <br />canal, and laterals. <br /> <br />Uni t lands and land use <br /> <br />fue irrigable acreage of the Great Northern unit would con3ist <br />entirely of class 2 and 3 land as shown in the tabulation below. <br /> <br />Land <br />class <br />Class 2 <br />Class 3 <br />Total <br /> <br />lrrigable acreage--Great Northen1 <br />(Uni t--acres) <br />Full irri- <br />gation <br />service <br />land <br />4,440 <br />3,630 <br />/j,C70 <br /> <br />Total <br />5,/j60 <br />4,800 <br />10,660 <br /> <br />unit <br /> <br />Supplemental <br />irrigation <br />service land <br />1,420 <br />1,170 <br />2,590 <br /> <br />Lands of the Great llorthern unit are from 6,200 to 7,000 feet in <br />elevation. TIley are situated in the stream valleys and on the rolling <br />hills between Elkhead and Fortification Creeks. The lands lie in small <br />tracts which are somewhat undesirable for irrigation fanning and the <br />development of fann units. <br /> <br />The soils comprising the unit lands are generally residual and more <br />than 5 feet in depth. Although fonned under a semiarid climate, they <br />contain sufficient organic material to be quite highly productive under <br />irrigation development. The soils are low in salinity and alkalinity. <br />'!'he lands have good surface drainage and good penneability which, along <br />with their scattered nature and natural drainageways, will facilitate <br />drainage. <br /> <br />The averaGe frost-free period in the unit area is 93 days and the <br />average irrigation season is 127 days. Precipitation averages about 16 <br />inches annually, 5 to 6 inches of which usually occurs from early May to <br />mid-September. Because of the climatic conditions and meager precipita- <br />tion, nonirrigated lands in the area are devoted mainly to the production <br />of dry land wheat, Lands with a partial irrigation supply produce alfalfa, <br />pasture, and small grains. With unit development, these will continue to <br />be the main crops grown. Dairying, however, will be the chief fann <br />enterprise. <br /> <br />38 <br />