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C 18-22"+ Dark brown (7.SYR 3/2) moist, the gravel <br />is 60 to 75 percent of the horizon; massive; <br />loose; noncalcareous; this layer contains much <br />mica. Most of the surface is covered with <br />gravel and cobble. In places rock outcrop <br />occurs. <br />Climatic Information <br />Average annual precipitation varies from 15 to 20 inches, but <br />may be as low as 12 inches if all other growth factors are <br />favorable. About 50% of this comes between May 1 and September <br />30. Hard, spotty rains are common in July and August, while <br />June is generally lacking in moisture. The optimum growing <br />season for the major native plants is May 15 to August 15. <br />Native Vegetation <br />Bunchgrasses give this site a grassland aspect. The dominant <br />grasses are Arizona fescue, mountain muhly, June grass, Parry <br />oatgrass and pine dropseed. Other grasses that may occur are <br />western wheatgrass, nodding brome, squirrel tail, needlegrasses, <br />native bluegrasses, sheep fescue, blue grama, and sedges. Common <br />forbs found in the plant community include yarrow, lupine. pents- <br />temon, American vetch, golden pea, buckwheat, and bluebell. <br />Shrubs such mountain mahogany, snowberry, skunkbrush, current, <br />and gooseberry may appear as scattered and isolated plants, <br />especially on the shallow rocky areas. <br />Native Vegetation found at the Elkhorn site and the estimated <br />species composition are: <br />June grass 5% <br />Arizona Fescue 15% <br />Fringe Sage 10% <br />Low rabbitbrush T <br />Blue Grama 15% <br />Squirrel Tail 10% <br />Slimstem Muhly 20% <br />Sedges 5% <br />Buckwheat T <br />Asters T <br />Range conditions at this site is poor. <br />Total Annual Production <br />Favorable years 900 pounds per acre air dry <br />Unfavorable years 500 pounds per acre air dry <br />Median Years 700 pounds per acre air dry <br />