LOCATION HOGRANCH WA+OREstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Vitrandic Haploxerolls
TYPICAL PEDON: Hogranch ashy silt loam - rangeland, on a 54 percent north-facing slope at 3,480 feet elevation. (Colors are for dry soil unless otherwise stated. All textures are apparent field textures.)
A1--0 to 4 inches; dark grayish brown (10YR 4/2) ashy silt loam, black (10YR 2/1) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and common fine roots; common very fine irregular pores; 5 percent gravel; neutral (pH 7.0); clear smooth boundary.
A2--4 to 8 inches; dark grayish brown (10YR 4/2) ashy silt loam, black (10YR 2/1) moist; weak medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine and common fine roots; common very fine irregular pores; 5 percent gravel; neutral (pH 7.0); clear wavy boundary.
A3--8 to 15 inches; dark brown (10YR 3/3) gravelly ashy silt loam, very dark brown (10YR 2/2) moist; weak medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine and common fine roots; many very fine irregular pores; 25 percent gravel; neutral (pH 7.0) clear wavy boundary. (Combined thickness of the A horizon is 11 to 17 inches)
2AB--15 to 21 inches; brown (10YR 4/3) gravelly loam, very dark grayish brown (10YR 3/2) moist; weak fine and medium subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; many very fine and common fine roots; many very fine irregular pores; 30 percent gravel; neutral (pH 7.0); abrupt wavy boundary. (6 to 12 inches thick)
2Bw1--21 to 34 inches; brown (10YR 4/3) extremely gravelly loam, dark brown (10YR 3/3) moist; moderate fine and medium subangular blocky structure; soft, friable, slightly sticky and slightly plastic; many very fine and common fine roots; many very fine tubular pores; 45 percent gravel and 20 percent cobbles; neutral (pH 7.0); clear wavy boundary.
2Bw2--34 to 38 inches; yellowish brown (10YR 5/4) extremely cobbly loam, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure parting to fine subangular blocky; slightly hard, friable, slightly sticky and slightly plastic; common very fine roots; many very fine tubular pores; 40 percent pebbles, 35 percent cobbles; neutral, (pH 7.2); clear wavy boundary.
2Bw3--38 to 46 inches; yellowish brown (10YR 5/4) extremely cobbly loam, brown (10YR 4/3) moist; moderate fine and medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; few very fine roots; common very fine tubular pores; 40 percent gravel and 35 percent cobbles; neutral (pH 7.2); abrupt irregular boundary. (Combined thickness of the Bw horizon is 20 to 35 inches)
3R--46 inches; basalt.
TYPE LOCATION: Yakima County, Washington, about 1705 feet north and 80 feet west of the southeast corner of section 30, T. 14 N., R. 22 E.; USGS Black Rock Spring topographic quadrangle; Latitude 46 degrees, 40 minutes, 27 seconds N, Longitude 120 degrees, 07 minutes, 00 seconds W
RANGE IN CHARACTERISTICS: Mean annual soil temperature is 44 to 47 degrees F. These soils are usually moist but are dry in all parts of the moisture control section for 85 to 95 consecutive days following the summer solstice. Thickness of the mollic epipedon is 20 to 29 inches thick. The A horizon has an estimated bulk density of 1.10 to 1.20 g/cc, volcanic glass content of 5 to 20 percent, acid oxalate extractable aluminum plus one-half extractable iron of 0.4 to 0.7 percent, and 15-bar water retention of 5 to 10 percent for air dried samples. The particle-size control section averages 15 to 20 percent clay in the fine earth fraction and 35 to 70 percent coarse fragments by volume. Depth to bedrock is 40 to 60 inches.
The A horizon has chroma of 2 or 3 dry and 1 or 2 moist.
The 2AB horizon has color value of 4 or 5 dry and 2 or 3 moist. It is gravelly silt loam, gravelly loam, or very gravelly loam.
The 2Bw horizon has color values of 4 or 5 dry and chroma of 3 or 4 dry or moist. It is very cobbly loam, extremely cobbly loam or extremely gravelly loam.
COMPETING SERIES: These are the Bearspring, Dogtown, Frint, Mineral, Peahke, Pelican (T), Scoap, and Wellscreek series. Bearspring soils are very deep, have C horizons, average 7 to 15 percent clay in the particle-size control section, are dry for 60 to 75 consecutive days, and mollic epipedons 10 to 15 inches thick. Dogtown soils have sandy loam textures, C horizons of loamy sand, are dry for 45 to 60 consecutive days, and mollic epipedons 10 to 20 inches thick. Frint soils are moderately deep to a lithic contact and are dry for 75 to 90 consecutive days following the summer solstice. Mineral soils are moderately deep to a lithic contact and are dry for 60 to 75 consecutive days following the summer solstice. Peahke soils are moderately deep to a lithic contact, have 20 to 30 percent volcanic glass and are dry for 45 to 60 consecutive days following the summer solstice. Pelican soils are very deep and have C horizons of dense glacial till. Scoap soils have 8 to 12 percent clay in the particle-size control section, bulk density of 1.20 to 1.50 g/cc, and are dry for 60 to 75 consecutive days following the summer solstice. Wellscreek soils have C horizons, are dry for 60 to 75 consecutive days and mollic epipedons 10 to 20 inches thick.
GEOGRAPHIC SETTING: Hogranch soils are on hillslopes and have slopes of 45 to 90 percent. These soils formed in loess influenced with volcanic ash over basalt colluvium. Average annual precipitation ranges from 12 to 16 inches. Elevation ranges from 3,100 feet to 4,200 feet. Summers are warm and dry and winters are cool and moist. Average annual temperature is 41 to 45 degrees F.; average July temperature is 68 degrees F. and average January temperature is 24 degrees F. Frost free season is 60 to 110 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Frint and Gidwin soils on hillslopes. Frint soils are 20 to 40 inches to bedrock. Gidwin soils are 12 to 20 inches to bedrock.
DRAINAGE AND PERMEABILITY: Well drained; very rapid runoff; moderate permeability.
USE AND VEGETATION: Livestock grazing and wildlife habitat. The native vegetation is bluebunch wheatgrass, Idaho fescue, Sandberg bluegrass, and threetip sagebrush.
DISTRIBUTION AND EXTENT: Central Washington and central Oregon; MLRA 8, 9, 10. Hogranch soils are of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Yakima County, Washington, Yakima Training Center, 1994.
REMARKS: Diagnostic horizons and features recognized in this pedon are a mollic epipedon from the surface to 21 inches, a cambic horizon from 21 to 44 inches and a lithic contact at 44 inches. The particle-size control section is the zone from 10 to 40 inches (part of the A3, the 2AB, and 2Bw1, 2Bw2, and part of the 2Bw3 horizons).