LOCATION CHAPOT WAEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Ultic Haploxeralfs
TYPICAL PEDON: Chapot gravelly sandy loam - forested, on a 35 percent southeast-facing back slope at an elevation of 3,700 feet. (Colors are for dry soil unless otherwise noted.)
Oi--0.5 inch to 0; decomposing forest litter.
A--0 to 6 inches; light brownish gray (10YR 6/2) gravelly sandy loam, very dark grayish brown (10YR 3/2) moist; weak medium granular structure; soft, very friable, nonsticky and nonplastic; many fine, and medium and coarse roots; common very fine tubular pores; 15 percent hard pebbles and 5 percent soft pebbles; neutral (pH 6.6); clear smooth boundary. (2 to 7 inches thick)
BA--6 to 14 inches; light yellowish brown (10YR 6/4) gravelly loam, dark yellowish brown (10YR 4/4) moist; weak fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common fine and medium roots; common medium tubular pores; 25 percent hard pebbles, 15 percent soft pebbles, and 10 percent cobbles; slightly acid (pH 6.4); clear smooth boundary. (5 to 10 inches thick)
Bt1--14 to 24 inches; light yellowish brown (10YR 6/4) very gravelly loam, yellowish brown (10YR 5/4) moist; weak medium subangular blocky structure; hard, very firm, slightly sticky and slightly plastic; common fine and medium roots; few fine and very fine tubular pores; few patchy faint clay skins on faces of peds; 45 percent hard pebbles, 15 percent soft pebbles, and 10 percent cobbles; slightly acid (pH 6.4); gradual wavy boundary. (7 to 15 inches thick)
Bt2--24 to 36 inches; brownish yellow (10YR 6/6) extremely gravelly clay loam, yellowish brown (10YR 5/4) moist; weak medium subangular blocky structure; hard, very firm, sticky and plastic; few medium roots; common medium and coarse tubular pores; common discontinuous faint clay skins on faces of peds and in pores; 50 percent hard pebbles, 10 percent soft pebbles, and 10 percent cobbles; neutral (pH 6.6); gradual wavy boundary. (10 to 20 inches thick)
Bt3--36 to 60 inches; brownish yellow (10YR 6/6) extremely gravelly clay loam, dark yellowish brown (10YR 4/4) moist; weak fine subangular blocky structure; hard, very firm, sticky and plastic; few medium roots; very few fine tubular pores; common discontinuous faint clay skins on faces of peds and in pores; 50 percent hard pebbles, 10 percent soft pebbles, and 15 percent cobbles; neutral (pH 6.6).
TYPE LOCATION: Chelan County, Washington; about 4.5 miles west of Swauk Pass on highway 97 and 1/2 mile north of Blewett Pass, 1,300 feet east of the center of section 35, T.22N., R.17E., W.M.
RANGE IN CHARACTERISTICS: These soils are usually moist but are dry in the moisture control section for 45 to 60 consecutive days following the summer solstice. Mean annual soil temperature at a depth of 20 inches is 43 to 47 degrees F. Rock fragments in the particle-size control section average 35 to 65 percent. Thickness of volcanic ash is 2 to 7 inches. Reaction is slightly acid to neutral. Some profiles are extremely boulder.
The A horizon has hue of 5YR, 7.5YR, or 10YR, value of 4 or 5 dry, 2 or 3 moist, and chroma of 3 or 4 dry or moist.
The Bt horizons have hue of 5YR or 7.5YR, value of 4 to 6 dry, 3 to 5 moist, and chroma of 3 to 6 dry or moist. It is very gravelly loam, very gravelly clay loam, extremely gravelly loam, extremely gravelly clay loam, very stony loam, very cobbly loam, very stony clay loam, very cobbly clay loam, or very bouldery clay loam.
COMPETING SERIES: These are Agatha, Euer, Inville, Jorge, Lorack, Rasser, and Shaser series. Agatha soils lack volcanic ash influence in surface layers. Euer soils have solum thickness of 24 to 36 inches and umbric epipedons. Inville soils have sandy loam, coarse sandy loam or loam Bt horizons. Jorge soils are medium to very strongly acid in the argillic horizon and are dry for more than 60 consecutive days following the summer solstice. Lorack and Rasser soils have strongly acid argillic horizons. Shaser soils have a 14 to 24 inches of volcanic ash mantle.
GEOGRAPHIC SETTING: Chapot soils are on back slopes of mountains at elevations of 2,000 to 4,900 feet. Slopes range from 30 to 60 percent slopes. Chapot soils formed in residuum and colluvium from basalt with a minor amount of volcanic ash. They are in a climate of warm, dry summers and cool, moist winter. The mean January temperature is about 23 degrees F., the mean July temperature is about 63 degrees F., and the mean annual temperature is 40 to 45 degrees F. The average annual precipitation is 22 to 40 inches. The growing season at 28 degrees F is 135 to 180 days. The frost-free season is 85 to 125 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Blewett, Brisky, Loneridge, Scotties and Shaser soils. Blewett soils are 10 to 20 inches deep to lithic contact. Brisky soils are 10 to 20 inches deep to lithic contact and are mesic. Loneridge soils are 35 to 55 percent clay in the particle-size control section. Scotties soils lack an argillic horizon and have a 7 to 12 inch mantle of volcanic ash. Shaser soils are 25 to 60 percent volcanic ash in the upper part of the solum from 14 to 24 inches.
DRAINAGE AND PERMEABILITY: Well drained; medium to very rapid runoff; moderately slow permeability.
USE AND VEGETATION: Woodland, livestock grazing, wildlife habitat, watershed and recreation. Native plants are Douglas-fir, grand fir, and ponderosa pine, with an understory of pinegrass, white spirea, pachystima, scouler willow, common princes pine, common snowberry, Cascade oregongrape, creambush oceanspray, and elk sedge.
DISTRIBUTION AND EXTENT: East slopes of the Cascade Mountains in Chelan and Kittitas Counties, Washington. The series is moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Chelan County, Washington, 1988.
REMARKS: Diagnostic horizons and features recognized in this profile are an ochric epipedon from the mineral surface to 6 inches, and an argillic horizon from 14 to 60 inches with 58 percent rock fragments in the 14 to 34 inch particle-size control section.