Wyoming west of Cheyenne, and continues in a northerly direction to the vicinity of Casper. There it turns
<br />east across the Great Plains and proceeds easterly and southerly into and across Nebraska. About 40 miles
<br />west of the Nebraska line it is joined by the Laramie River. At North Platte, Nebraska, it is joined by the
<br />South Platte, forming the Platte River. It empties into the Missouri River at Plattsmouth, near the western
<br />border of Iowa. In North Park it is a rapid mountain stream. In eastern Wyoming it gradually broadens out,
<br />losing velocity. In western and central Nebraska its channel ranges from 3000 to 6000 feet; it frequently
<br />divides into small channels; and in times of low water is lost in the deep sands of its bed. Here it is
<br />sometimes characterized as a river'two miles wide and one inch deep.'
<br />There are six natural sections of the river basin: (1) North Park, Colorado, or more accurately Jackson
<br />County; (2) Colorado- Wyoming line to the Pathfinder Reservoir located between Rawlins and Casper,
<br />Wyoming; (3) Pathfinder Reservoir to Whalen, Wyoming which is 42 miles from the Nebraska line; (4)
<br />Whalen, Wyoming to the Tri -State Dam in Nebraska near the Wyoming- Nebraska tine; (5) Tri -State Dam
<br />to the Kingsley Reservoir, west of Keystone, Nebraska; (6) Kingsley Reservoir to Grand Island, Nebraska.
<br />3 [325 U.S. 589, 594] The river basin in Colorado and Wyoming is arid, irrigation being generally
<br />indispensable to agriculture. Western Nebraska is partly and and partly semi -arid. Irrigation is
<br />indispensable to the kind of agriculture established there. Middle Nebraska is sub - humid. Some crops can
<br />be raised without irrigation. But the lack of irrigation would seriously limit diversification. Eastern
<br />Nebraska, beginning at Grand Island, is sufficiently humid so as not to justify irrigation.
<br />Irrigation in the river basin began about 1865, when some projects were started in eastern Wyoming and
<br />western Nebraska. Between 1880 and 1890 irrigation began on a large scale. Until 1909 storage of water
<br />was negligible, irrigation being effected by direct diversions and use. Prior to 1909 the development in
<br />Colorado and Wyoming was relatively more rapid than in Nebraska. Since 1910 the acreage under
<br />irrigation in Colorado increased about 14 per cent, that of Wyoming 31 per cent, and that of Nebraska
<br />about 100 per cent. 4 The large increase in Nebraska is mainly attributable to the use of storage water from
<br />the Pathfinder Reservoir. 5
<br />The Pathfinder Reservoir is part of the 'North Platte Project' which followed the adoption by Congress in
<br />1902 of the Reclamation Act. 32 Stat. 388, 43 U.S.C.A. 372, 373, 381, 383, 391 et seq. Pathfinder was
<br />completed in 1913. It has a capacity of 1,045,000 acre
<br />[]
<br />Colorado Wyoming Nebraska * Total [] 1880 200 11,000 _ 11,200 1890 44,500 86,000 15,300 145,800
<br />1900 83,500 169,100 105,690 358,290 1910 113,500 224,500 192,150 530,150 1920 129,140 265,375
<br />306,930 701,445 1930 130,540 307,105 371,300 808,945 1939 131,810 325,720 383,355 840,885 []
<br />* not including about 65,000 acres now irrigated from the Platte River between North Platte and Kearney,
<br />Neb.
<br />5 Of the 174,650 acre increase since 1910, 104,000 acres are North Platte Project lands. [325 U.S. 589,
<br />595] feet, which is 79 percent of the average annual run -off of the North Platte River at that point. This
<br />project includes an auxiliary channel reservoir called Guernsey, located above Whalen, Wyoming. Its
<br />capacity is 50,870 acre feet. The project also includes two small reservoirs in Nebraska -Lake Alice and
<br />Lake Minatare- having a capacity of 11,400 and 67, 000 acre feet respectively. There are two main supply
<br />canals - Interstate and Fort Laramie -which take out from the North Platte at the Whalen diversion dam. The
<br />Interstate canal runs on the north side and the Fort Laramie on the south side of the river. Both extend far
<br />into Nebraska. Northport-a third canal -is located wholly in Nebraska. These canals and their laterals extend
<br />over 1600 miles. The project also includes a drainage system and two hydroelectric power plants. The
<br />United States contracted with landowners or irrigation districts for use of the water- selling it, as
<br />contemplated by the Reclamation Act, so as to recoup the cost of the project which was about $19,000,000.
<br />It also entered into so- called Warren Act contracts pursuant to the Act known by that name (36 Stat. 925,
<br />43 U.S.C.A. 523 et seq.) which authorized the Secretary of the Interior to contract for the storage and
<br />delivery of any surplus water conserved by any reclamation project in excess of the requirements of the
<br />project.
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