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li.' 00 C't': - two classes according to productive capacity. Class 1 arable lands, or those of first quality, are highly productive and desirable in every respect for permanent irrigation agriculture. Class 2 arable lands are less desirable for development or more costly to prepare for irrigation owing to an unfavorable topography, or are somewhat limited in produc- tive capacity because of a slight deficiency in one or more of the fac- tors considered. c The results of the classification are summarized as follow~:' , Colorado Division Land Classification Unit: Acres Non-irrigated I}'rigated Grand Area :Class l:Class 2:Tota+ :Class l:Class 2: Total Total Upper Ditches 6,590 :6,590 : 5,310 5,310 11,900 Lower Di tches : 310 2,860 :3,170 : 4,330 :10,410 :14,740 17,910 Total 310 9,450 :9,760 4,330 :15,720 :20,050 29,810 Net area 290 8,880 :9,170 4,070 :14,780 :18,850 28,020 Net acreages were obtained by deducting six percent from the gross acre- age for rights-of-way, roads, farmsteads, and other nonproducing areas. The tabulation does not include lands in Long Hollow and State Line Reservoir sites. The irrigated area in New Mexico was mapped and a reconnaissance classification was made of the adjacent lands by the Bureau of Recla- mation in 1933. The survey showed a net area of 4,890 acres irrigated that year, or within the previous five years, including 270 acres irri- gated within the State Line Reservoir site. The State Engineer of New Mexico completed a resurvey of the area in 1938. The results showed 3,790 acres irrigated, and 520 acres of fallow land, which are indi- cated on drawing 56-D-427. On the basis of this survey a total of 3,800 acres was recommended by the New Mexico water users as an equitable figure for the project area. This has been accepted for Bureau of Recla- mation studies. Construotion of State Line Reservoir would retire about 235 acres of land irrigated in 1938, but it is anticipated that this would be replaced from fallow land. 18