. Bulletin. 1901-13. Agriculture; Agriculture. T The Groat Salt Lake of Utah and a large depression in Nevada, formerly occupied bv Lake Lahontan. are the two most impt)rtant drainage centers, but there are numerous smaller lakes and sinks quite independent of these. In addition to the agricultural land in the (ireat Basin j)rt)per there is a consideiable area of arable land lying IxHween the eastern side of the Gi-eat Basin and the Kocky Mountains. This constitutes the northern portion of the Colorado Kiver drainage basin, but in view of the similarity of conditions pre- vailing over this reg
. Bulletin. 1901-13. Agriculture; Agriculture. T The Groat Salt Lake of Utah and a large depression in Nevada, formerly occupied bv Lake Lahontan. are the two most impt)rtant drainage centers, but there are numerous smaller lakes and sinks quite independent of these. In addition to the agricultural land in the (ireat Basin j)rt)per there is a consideiable area of arable land lying IxHween the eastern side of the Gi-eat Basin and the Kocky Mountains. This constitutes the northern portion of the Colorado Kiver drainage basin, but in view of the similarity of conditions pre- vailing over this region and the near-by (ireat Basin it seems proper to include both in a discussion of the agriculture of the section, and in the present paper the term '' Great Basin area " is used to include not only the Great Basin proper, but also the region In'tween it and the Rocky Mountains. By far the larger part of the arable land of the Great Basin area lies at an alti- tude of more than feet above sea level. The topog- raphy is broken by numer- ous moluitain ranges, so that the arable land is con- fined to the intervening val- leys and wash plains. These wash plains often occur ns high mesas, with a gently rolling topograph}' except where they are cut by the of streams and re- cent erosions. The valleys of water courses are now all more or less develo])ed by irriga- tion, while the higher mesas which can not be reached by gravity canals remain to be utilized without irrigation, if at all. In the eastern part of tiie (ireat Basin area, where most of the dry farming is now done, the valleys and mesas are relatively small. One or two of them are IT) or "JO miles across, but many are only 1 to \ miles across and f>f varying lengths. Often they lie lietween high tiniiHM'-covered mountains that furnish and a tim- l«'r sup|)ly. as well as vainalde lange land. In other cases they are surrounded by relatively bairen hills, which atford iieilher wat
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