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$~ 90IL SURVEY `l~~ and fine sandy loam, 3 to 25 percent elopes. oil is on glacial terraces, fans, and moraines In the southern part of the survey area. Slopes range from 3 to 25 percent but are mostly 3 to 15 percent. This soil has the profile described as representative of the aeries. Included with this soil in mapping are a few small rock streams in slightly higher or steeper areas and small areas of Troutville and Cowdrey soils in ]ow drainageways. Runoff is medium.'The hazards of soil blowing and water erosion are moderate. Most of the acreage of this soil is in forest. A small acreage is cleared and is used for grazing. Capability unit VIe~I, nonirrigated; not placed in a range site. LaF-Larand fine sandy loam, 25 to 40 percent slopes. This soil is on glacial moraines and steep areas on fans in the southern part of the survey area. Included with this soil in mapping are a few small areas of Troutville soils, rock streams adjacent to drainage channels, and a few areas in which rock makes up a large amount of the surface area. Runoff is medium. The hazard of soil blowing is moderate, and the hazard of water erosion is high. Moat of the acreage of this soil is in forest. Ca- pability unit VIIe-2, nonirrigated; not placed in a range site. wheatgrasses, Sandberg bluegrass, needlegrasses rive brome, junegrass, sedges, squirreltail, and sage (fig. 7). The mean annual precipitation is 15 inches, the mean annual air temperature is 34° t, F, and the frost-free season is 30 to 40 days. In a representative profile the surface layer is grayish brown loam about 9 inches thick. The ups inches of the subsoil is dark brown loam, the midd inches is brown light clay loam, and the lower 9 it is light yellowish brown light clay loam in which has accumulated. The underlying material is light lowish brown loam. Permeability is moderate, and available ware pacity is high. These soils are used mainly for grazing. Some are used for irrigated hay and pasture. Representative profile of Leavitt loam in n grass, center of sec. 3, T, 7 N., R. 78 W.: Al-0 to 9 inches; dark grayish brown (lOYR 4/2) very dark brown (lOYR 2/2) moiat• weak platy structure parting to moderate medium c soft, very friable, slightly sticky and nonp many fine mote; neutral; clear smooth bound Bl-9 to 13 inches; dark brown (lOYR 4/3) loam, brown (IOYR 3/31 moist: moderate median Leavitt series cent gravej; neutral; clew jai B2t-13 to 23 inches; brown (10YR The Leavitt series consists of deep, well drained dark brown (lOYR 4/3) me soils that formed in glacial outwash and old alluvium. prismatic structure parting They are on alluvial fans and sides of valleys between . subangular blocky; very ha elevations of 8;200 and 9,200 feet. Slo es are 2 to b plastic; few fine roots; thin P films on peels; 6 percent fine percent. The native vegetation is mainly Idaho fescue, ua1 wavy boundary. _..x..~ Figure 7. Arco of Leavitt loam.