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l ~f4-DF Anvik loam, 12 to 45 percent slopes • This deep, well drained soil is on moderately steep to steep mountain slopes. I[ is formed in colluvial and alluvial material derived from sand- stone and shale. Elevation isf~00 to lO,OC~i feet, The average annual pre- cipitatioa is about 20 [0 30 inches. The average annual air temperature is about 36 to 42 degrees F., and the average frost-free season is about 75 to 100 days. Typically, the surface is covered by a 4 inch thick layer of organic material. The surface layer is typically a dark brown loam about 13 inches [hick. The lower portion of the surface horizon is a Iight }•ellowish brown sandy loam about 6 inches thick. The upper portion of the subsoil is light yellowish brown and brown sandy clay loam about 4 inches thick. The middle portion is brown sandy clay loam about 23 inches thick. The lower porti~+n • is brown sandy clay loam [o over 60 inches in depth. Included with [his soil in mapped areas are about 15 percent Nordic very stony fine sandy loam and small areas of Leadvi]Io :+nci Vnlto s++ils. Permeability is moderate. Cffective rooting depth is more than 60 incl+es. Surface runoff is moderate and erosion hazard is moderate. Available water capacity is high. hfost of the mapping unit is used for woodland and livestock grazin{;. Small areas are used for homesite developments. it is also used f+~r wildlife. This unit is well suited to the production of 4lhite fir. Rased on a site index of ~-' the potential production of marketable timber is cubic feet orC'_•. ~ board feet per acre (International rule) from an even-abed, fully stocked stand of trees years old. Other trees moderately well suited • to this unit are Douglas fir, I:ngelmann spruce and aspen. Tlie main concerns in producing and harvesting timber are reforestation and prevention ,of water erosion . -- ._ ..