LOCATION BOGRAP WAEstablished Series
TAXONOMIC CLASS: Fine-loamy, isotic, frigid Vitrandic Palexeralfs
TYPICAL PEDON: Bograp ashy sandy loam under coniferous forest, on a 46 percent convex northeast facing slope at an elevation of 2,180 feet. (Colors are for dry soil unless otherwise noted. When described the soil was moist.)
Oe--0 to 4 inches; moderately decomposed forest litter. (2 to 4 inches thick)
A1--4 to 12inches; brown (7.5YR 5/3) ashy sandy loam, dark brown (7.5YR 3/3) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and fine roots; many very fine irregular pores; 2 percent gravel; NaF pH 8.5; neutral (pH 6.6); clear wavy boundary.
A2--12 to 19 inches; reddish brown (5YR 5/3) ashy loam, dark reddish brown (5YR 3/4) moist; weak fine granular and weak fine subangular blocky structure; slightly hard, friable, nonsticky and slightly plastic; common very fine and fine roots; many very fine irregular pores; 2 percent gravel; NaF pH 8.5; slightly acid (pH 6.4); abrupt smooth boundary. (Combined thickness of the A horizon is 7 to 15 inches)
BA--19 to 28 inches; brown (7.5YR 5/4) gravelly loam, dark brown (7.5YR 3/4) moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots; common very fine tubular pores; 15 percent gravel; NaF pH 8.0; slightly acid (pH 6.4); abrupt wavy boundary. (Combined thickness of 2BA horizon is 5 to 21 inches)
Bt--28 to 64 inches; strong brown (7.5YR 5/6) cobbly clay loam, strong brown (7.5YR 4/6) moist; moderate medium and coarse subangular blocky structure; hard, firm, sticky and plastic; few medium and coarse roots; common very fine tubular pores; few faint clay films on faces of peds and in pores; 5 percent gravel and 15 percent cobbles; NaF pH 8.0; moderately acid (pH 6.0). (30 to 50 inches thick)
TYPE LOCATION: Kittitas County, Washington; about 6 miles west of Cle Elum; 800 feet east and 1,400 feet north of the southwest corner section 30, T. 20 N., R. 15 E.; USGS Ronald Washington quad, (Latitude 47 degrees, 11 minutes, 39 seconds N. and Longitude 121 degrees, 01 minute, 22 seconds W.)
RANGE IN CHARACTERISTICS: The solum is 60 inches or more thick. The mean annual soil temperature is 45 to 46 degrees F. The soils are usually moist, but are dry in all parts in the moisture control section for 60 to 75 consecutive days following the summer solstice. The particle-size control section has 18 to 35 percent clay and 30 to 45 percent sand in the fine earth fraction. It has 10 to 35 percent rock fragments. The upper 7 to 15 inches of the solum has an estimated bulk density of 1.10 to 1.30 g/cc, volcanic glass content of 7 to 25 percent, acid oxalate extractable aluminum plus one-half iron of 0.4 to 0.7 percent, and 15-bar water content of 5 to 10 percent for air-dry samples.
The A1 horizon has hue of 10YR, 7.5YR or 5YR, value of 4 to 6 dry, 3 or 4 moist and chroma of 2 to 4 dry and moist. It has 0 to 10 percent gravel. Texture is ashy fine sandy loam or ashy sandy loam. Reaction is moderately acid to neutral.
The A2 horizon has hue of 10YR or 5YR, value of 4 to 6 dry, 3 or 4 moist and chroma of 3 or 4 dry and moist. Texture is ashy loam, ashy fine sandy loam or ashy sandy loam. Reaction is moderately acid to neutral.
The BA or AB horizon has hue of 10YR or 5YR, value of 4 to 6 dry, 3 or 4 moist and chroma of 4 to 6 dry. Texture is loam, fine sandy loam or gravelly loam. It has 0 to 20 percent gravel.
The Bt horizon has hue of 7.5YR or 10YR, value of 5 or 6 dry, 3 to 5 moist and chroma of 3 to 6 dry and moist. Texture is loam, clay loam, silty clay loam, gravelly clay loam or cobbly clay loam. Reaction is moderately acid to neutral. It has 0 to 35 percent gravel and cobbles.
COMPETING SERIES: These are the Ketchly, Kruse, McEwen, Nahahum, Neuske, and Sedlow series. Ketchly soils have a solum 30 to 50 inches thick and have an umbric epipedon. Kruse soils have hue of 10YR in the A and AB horizons, have lamellae in the Bt2 horizon, and have rock fragments of granite, gneiss, or mica shist origin, when present. McEwen soils have a solum 40 to 60 inches thick over stratified, extremely gravelly mixed alluvium. Nahahum soils have an albic horizon and a particle-size control section with 15 to 35 percent rock fragments of schist or gneiss origin. Neuske soils have an albic horizon. Sedlow soils are 40 to 55 inches to a lithic contact.
GEOGRAPHIC SETTING: Bograp soils are on mountain side slopes and have slopes of 3 to 65 percent. These soils formed in colluvium and residuum from andesite and Teanaway basalt mixed with volcanic ash in the surface. Elevation ranges from 2,150 to 4,200 feet. These soils are in a climate with warm, dry summers and cool, moist winters. The mean annual precipitation is 35 to 50 inches. The mean January temperature is about 26 degrees F. and the mean July temperature is about 65 degrees F. The mean annual temperature is 43 to 45 degrees F. The frost-free season is 70 to 145 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Roslyn and Roxer soils. Roslyn soils are on terraces and are coarse-loamy. Roxer soils are on mountain side slopes and toe slopes and lack an argillic horizon and have greater than 35 percent rock fragments in the family control section.
DRAINAGE AND PERMEABILITY: Well drained, medium runoff; permeability is moderately slow.
USE AND VEGETATION: These soils are used for commercial timber production, recreation, wildlife habitat and watershed. Vegetation is Douglas-fir, ponderosa pine and grand fir with an understory of rose, pinegrass and elk sedge.
DISTRIBUTION AND EXTENT: East slopes of the Cascade Mountains in Central Kittitas County, Washington. MLRA 6. This series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Wenatchee National Forest, Kittitas County, Washington, 2003.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - from 4 to 19 inches (A horizon)
Argillic horizon - from 28 to 60 inches (Bt horizon)
Vitrandic feature - from 4 to 12 inches (A horizons)
Base saturation - 60 to 70 percent in the Bt horizon (assumed)