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4-75 <br />• <br /> <br />4.7.4.5 Map Unit: HrAB - Havre Loam, 0 to 6 Percent Slopes <br />This map unit is on nearly level to gently sloping valley bottoms <br />and flood plains. The slope is 0 to 8 percent. The native vege- <br />tation is mainly a greasewood-shrubland community. <br />Included in this map unit is about 10 percent Bankard loamy sand <br />and about 5 percent stratified alluvium. Included areas make up <br />about 15 percent of the total acreage. The Bankard soil is a <br />member of the sandy, mixed, mesic family of the Ustic Torrifluvents. <br />The alluvium is sandy, gravelly sand and very gravelly sand and a <br />member of the mixed, mesic family of Ustic Torripsamments. <br />Typically, the surface layer of the Havre soil is a light brownish <br />gray or light gray loam about 6 inches thick. The substratum to <br />a depth of 60 inches or more is a brown or grayish brown, light <br />gray startified loam, silty clay loam or sandy loam. <br />Permeability of the Havre soil is moderate. Available water <br />capacity is moderate to moderately high. Effective rooting depth <br />is 60 inches. Runoff is slow and the erosion hazard for water is <br />moderate. Wind erosion hazard is slight. <br />The unit is mainly used for rangeland and wildlife habitat. It <br />is also used for pasture. <br />The present plant community consists of cheat grass with big sage <br />and greasewood. <br /> <br />