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The soils of mapping unit number 26 have moderate shrink/swell ratios; however, this is generally not a • serious limitation to their engineering uses. Potential total extensibility of a 40-inch section ranges from 0.8 to 2.0 inches. In their native state, these soils are not subject to accelerated erosion. However, they are subjec[ to accumulation from other eroding areas. Minor gulle}dng occurs on areas where the vegetation has been depleted. These soils are somewha[ subject to water and wind erosion if relocated or maintained without vcGetative cover. Mass movement is only moderately possible, especially in abnormally wet years. The major slide area is just east of Minnesota Reservoir. Chemical Properties and Natural Fertility -These are weakly developed soils formed under sedimentary in0ucnces from higher areas. The deposition of material has occurred over long periods of time, but yeecunion has continued to thrive. The result is a thick dark surface horizon with a greater than normal fcnilite. Normally, the soils of this unit are noncalcareous in excess of 40 inches with reaction ranging from neutral to mildly alkaline. There is little or no fret carbonate in these soils to depress the availability of phosphorus; however, there is no deficiency in bases. Natural fertility levels arc above average for the study area. No deficiencies of essential plant nutrients were noted. Rcvegetated areas will need additions oC nitrogen, but a continuing program will not be needed. 1\lannine Unit Number X26 -This mapping unit has the same description as mapping unit number 26. Classification of Maior Components -The components listed below comprise the major part of the • mapping unit: A. Pachic Cryoboroll (Chcrnozem). I. Fine-loamy, mixed family. (Adel Series) B. Typic Cryoboroll (Chernozem). (Emerald Series) (Teton Series) Extent and Maior Areas of Occurrence -Mapping unit number X26 has a moderately large total acreage in the study area. It occurs in largest acreage on the floodplains of the Dry Fork of Minnesota Creek, the East Fork of Minnesota Creek, and their major tributaries. Characteristic Tonoeranhv - Soils of this mapping unit occur on gently to moderately sloping floodplains and concave drainage channels. Slopes range from less than 1 percent to about 20 percent. Physical Properties -The soils of mapping unit number X26 have for the most part the same physical properties as mapping unit number 26, with the exception of mass movement. The major slide area for mapping unit number 26 is east of Ainnesota Reservoir which does not apply to mapping unit number X26. Chemical Properties and Natural Fertility -The soils of mapping unit number X26 for the most part have the same chemical properties as mapping unit number 26, with the exception of available nitrogen. Temporary shortages of available nitrogen may also occur during cold wet spring months when soil bacterial activity is low. These are naturally occurring phenomena in soils of higher elevations and are usually only tmporary•.