PERMFILE55627 - Laserfiche WebLink

Home Browse Search

DoD _ ~ Gca ~/ c~~ of / { i~ DoD L . .. ~~ ~~ ` Gca _ The Dominion series consists of somewhat exces- sively drained on terraces and terrace edges. These soils arc eery Jloly over cobbles, gravel, :uid sand. They formed iri gravelly, moderately coarse textured outwash. Slopes range fi'om 1 to 45 percent. Elevation ranges from 7,200 to 8,800 feet. The plant cover is mainly short and mid grasses, but there is an overstory of pinyon pine and juniper on some of the steeper slopes. The average annual precipitation is 11 to 16 inches. The average annual soil temperature is 96° F., and the average soil temperature in summer is 64°. The frost-free season is 75 to 100 days. In a representative p1'ofile the surface layer is dark- brown gravelly sandy loam about 6 inches thick. The next layer is dark-brown very gravelly sandy loam about 5 inches thick. Below this is mixed gravel and cobbles that extend to a depth of 60 inches or more. The soil is neutral in the uppermost 3 inches and mildly alkaline below that depth. Permeability in these soils is very rapid, and the available water capacity is low. Effective rooting depth is 60 inches or mare. Dlost areas of the DominsonA simallracreageniseused are used for grazing (fig. 7). far irrigated hay. Representative profile of Dominson gravelly sandy loam, 1 to 9 Persect 15pT. 15 SativRe 78n~ nChaffee center of SW /.~ County All-0 to 3 inches, brown (lOYR 6/3) gravelly sandy loam; dark brown (10YR 3/3) moist; weak, thin, platy structure parting to weak, fine, granular; slightly hard, very friable, nonsticky; many fine o and medium roots; 15 percent gravel and cobbles; w neutral; clear, smooth boundary. ~_ A12-3 to 6 inel+es, brown (101'R 5/3) gravelly sandy loam: dark brown (lOYR 3B) moist; weak, medium, sub- ~ angular blocky structure; slightly har~5 fervent nonsticky: many fine ~+ddme ailkal ne tsclear wavy gravel and cobbles; Y boundary. ravell AC-6 t sandy loam adarkbbrown((10YR43/3) moYsg; weak friable, ~nonstickyaco ninon finecand med umyroots; 50 percent gravel and cobbles; mildly alkaline; gradual, '.wavy boundary. SIC-11 to 60 inches, mixed igneous cobbles, gravel, and sand; lime coatings in places on underside of large gravel. The A horizon generally ranges from 6 to 8 inches in thickness, but where there ~s no AC horizon, the A horizon is 7 to 75 inches thick. This horizon is very dark brown or dark brown. Gravel and cobbles cover 5 to 25 percent of the soil surface. Reaction ranges from 6.6 to 7.6. Depth to the IIC horizon ranges from 8 to 16 inches. Dominson gravelly sandy loam, 1 to 9 percent slopes (DoD).-This soil is on alluvial fans and high terraces in nearly all parts of Chaffee County. It has the profile described as representative of the series. Included with this soil in mapping are small areas of St. Elmo ~. \ ~ gravelly sandy loam, 1 to 3 percent slopes. Surface runoff is medium, and the hazard of erosion is moderate. About 80 percent of the acreage is in range that is used for grazing. The remaining 20 per- . cent is in irrigated hay, mainly alfalfa. Most of the irrigation is in areas where slopes are 3 to 5 percent. TCapaNbllityauni0utwashlrange sate~~ nonirrigated; '1D0 - SHEET NUMBER 19 - R. 79 W. •8 W.