LOCATION CROCAMP WAEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Vitrixerandic Humicryepts
TYPICAL PEDON: Crocamp very stony ashy sandy loam- rangeland, on a 34 percent south-facing slope at an elevation of 6,300 feet. (When re-described on September 30, 1993 the soil was dry throughout. Color are for dry soil unless otherwise stated. All textures are apparent field textures.)
A--0 to 10 inches; dark grayish brown (10YR 4/2) very stony ashy sandy loam, black (10YR 2/1) moist; weak fine and medium subangular blocky structure; soft, very friable, nonsticky and slightly plastic; many very fine and fine roots and common medium roots; common fine irregular pores; 15 percent gravel, 5 percent cobbles, and 20 percent stones; slightly acid (pH 6.4); gradual wavy boundary. (9 to 20 inches thick)
AB--10 to 17 inches; brown (10YR 5/3) very cobbly ashy sandy loam, very dark grayish brown (10YR 3/2) moist; weak fine and medium subangular blocky structure; soft, very friable, nonsticky and slightly plastic; many very fine and fine roots and few medium roots; common fine irregular pores; 15 percent gravel, 20 percent cobbles, and 5 percent stones; slightly acid (pH 6.2); clear wavy boundary. (0 to 10 inches thick)
2Bw--17 to 30 inches; light yellowish brown (10YR 6/4) very cobbly coarse sandy loam, dark yellowish brown (10YR 4/6) moist; weak fine and medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; few very fine and fine roots in the upper part; few fine irregular pores; 25 percent gravel, 25 percent cobbles, and 5 percent stones; moderately acid (pH 6.0); clear wavy boundary. (10 to 15 inches thick)
2C--30 to 42 inches; pale brown (10YR 6/3) very cobbly coarse sandy loam; brown (10YR 5/3) moist; massive; soft, very friable, nonsticky and nonplastic; few very fine roots; 20 percent gravel, 30 percent cobbles and 5 percent stones; moderately acid (pH 6.0); abrupt wavy boundary. (8 to 15 inches thick)
2R--42 inches; granitic bedrock.
TYPE LOCATION: Okanogan County, Washington; about 15 miles southwest of the town of Loomis, Washington; 2,220 feet east of the northeast corner section 35, T. 38 N., R. 23 E. (Latitude 48 degrees, 45 minutes, 20 seconds N, Longitude 119 degrees, 55 minutes, 12 seconds W).
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 37 to 42 degrees F. Mean summer soil temperature is 52 to 58 degrees F. These soils are usually moist but are dry in the moisture control section for 45 to 60 consecutive days following the summer solstice. The umbric epipedon is 10 to 20 inches thick and has an estimated bulk density of 1.15 to 1.45 g/cc, volcanic glass content of 5 to 20 percent, acid-oxalate extractable aluminum plus one-half of the acid-oxalate extractable iron of 0.4 to 1.0 percent, and 15-bar water retention of 5 to 10 percent for air dried samples. The particle-size control section averages 35 to 65 percent rock fragments and 3 to 8 percent clay. The solum has a base saturation by NH4OAc is 35 to 50 percent.
The A horizon has value of 3 to 5 dry, 1 to 3 moist, and chroma of 1 to 3 dry or moist.
The AB horizon has value of 4 to 6 dry, 2 to 4 moist, and chroma of 2 to 4 dry or moist. The texture is very cobbly ashy sandy loam or very cobbly ashy coarse sandy loam. It is 15 to 30 percent gravel, 10 to 30 percent cobbles, and 0 to 15 percent stones. Reaction ranges from moderately acid to slightly acid.
The 2Bw has hue of 7.5YR or 10YR, value of 4 to 6 dry, 3 to 6 moist, and chroma of 3 to 6 dry or moist. The texture is very gravelly coarse sandy loam or very cobbly coarse sandy loam. It is 25 to 55 percent gravel, 10 to 30 percent cobbles, and 0 to 15 percent stones. Reaction ranges from moderately acid to slightly acid.
The 2C horizon has values of 5 to 6 dry, 4 or 5 moist and chromas of 3 or 4 moist or dry. It is very cobbly coarse sandy loam or very stony coarse sandy loam. It is 25 to 55 percent gravel, 10 to 30 percent cobbles and 0 to 15 percent stones. Reaction is moderately acid to slightly acid. Base saturation is 50 to 80 percent.
COMPETING SERIES: These are the Dollarlake, Fruitcreek, Granitemountain and Leespeak series. Fruitcreek and Leespeak are moderately deep to bedrock. Dollarlake and Granitemountain soils are very deep.
GEOGRAPHIC SETTING: Crocamp soils are on back slopes and shoulders of mountains. These soils are mainly on southerly aspects at elevations of 5,200 to 7,800 feet. Slopes are 0 to 65 percent. These soils formed in colluvium from granitic and metamorphic rock with a component of volcanic ash in the upper part. Average annual precipitation ranges from 25 to 35 inches. The climate is characterized by cold, wet winters and cool, dry summers. The average January temperature ranges from 18 to 22 degrees F., and the average July temperature ranges from 52 to 58 degrees F. The average annual air temperature ranges from 37 to 41 degrees F. The frost-free season is 60 to 95 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Burget, Devore, Myerscreek, and Treebutte soils. Burget soils are on shoulders, ridges, and back slopes of mountains and are shallow to a paralithic contact. Devore soils are on back slopes and shoulders of mountains and are moderately deep to hard bedrock. Myerscreek soils are on back slopes, foot slopes, and toe slopes and are very deep formed in compact glacial till. Treebutte soils are on ridges and shoulders of mountains and are shallow to hard bedrock.
DRAINAGE AND PERMEABILITY: Well drained, rapid to very rapid runoff, moderately rapid permeability.
USE AND VEGETATION: Wildlife habitat, livestock grazing, recreation, and watershed. Native vegetation is mountain big sagebrush, aster, Idaho fescue, eriogonum, pinegrass, mountain brome, oniongrass, prairie junegrass and wideleaf sedge.
DISTRIBUTION AND EXTENT: Northcentral Washington. Series is small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Okanogan National Forest, Okanogan County, Washington, 2005.
REMARKS: Diagnostics horizons and features recognized in this soil are an umbric epipedon from the surface to 17 inches and a cambic horizon from 17 to 30 inches. The particle-size control section is the zone from 10 to 40 inches. Vitrandic properties from 0 to 17 inches. Base saturation by NH4OAc by horizon is 49, 38, 46 and 77 percent.
ADDITIONAL DATA: NSSL pedon numbers S93WA-047-005.