LOCATION JUMPE WAEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, isotic, frigid Vitrandic Haploxerepts
TYPICAL PEDON: Jumpe stony ashy loam - under a coniferous forest on a 40 percent concave northeast-facing slope at an elevation of 4,820 feet. (Colors are for dry soil unless otherwise stated. All textures are apparent field textures).
Oe--0 to 2 inches; partially decomposed forest litter. (1 to 3 inches thick)
A--2 to 4 inches; brown (10YR 5/3) stony ashy loam, very dark grayish brown (10YR 3/2) moist; weak very fine granular structure; slightly hard, very friable, nonsticky and nonplastic; many fine and medium roots; many fine irregular pores; 10 percent angular gravel, 10 percent angular cobbles and 5 percent surface stones; NaF pH 8.8; moderately acid (pH 6.0); abrupt smooth boundary. (1 to 6 inches thick)
Bw1--4 to 12 inches; yellowish brown (10YR 5/4) cobbly ashy loam, dark yellowish brown (10YR 4/4) moist; weak medium and fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many fine and medium roots; many fine tubular pores; 10 percent angular gravel and 20 percent angular cobbles; NaF pH 8.5; slightly acid (pH 6.2); abrupt smooth boundary.
Bw2--12 to 28 inches; yellowish brown (10YR 5/4) very cobbly ashy loam, brown (7.5YR 4/4) moist; weak medium and fine subangular blocky structure; slightly hard, friable, slightly sticky and moderately plastic; common fine and medium roots; many fine tubular pores; 25 percent angular gravel and 25 percent angular cobbles; NaF pH 8.8; slightly acid (pH 6.2); clear smooth boundary. (Combined thickness of the Bw horizon is 20 to 39 inches)
2BC--28 to 60 inches; light yellowish brown (10YR 6/4) extremely cobbly loam, dark yellowish brown (10YR 3/4) moist; massive; hard, firm, slightly sticky and slightly plastic; common fine and medium roots; many coarse irregular pores; 20 percent angular gravel and 50 percent angular cobbles; slightly acid (pH 6.2).
TYPE LOCATION: Kittitas County, Washington; about 4.5 miles southwest of Colockum Pass; 1,600 feet north and 2,400 feet east of the southwest corner section 31, T. 20 N., R. 20 E.; USGS Naneum Canyon, Washington quad; Latitude 47 degrees, 10 minutes, 48 seconds N. and Longitude 120 degrees, 22 minutes, 33 seconds W.
RANGE IN CHARACTERISTICS: Average annual temperature is 43 to 47 degrees F. These soils are usually moist but are dry in the moisture control section for 60 to 75 consecutive days following summer solstice. The upper 25 to 45 inches of the solum has an estimated moist bulk density of 1.15 to 1.35 g/cc, volcanic glass content of 6 to 20 percent, acid-oxalate extractable aluminum plus one-half iron of 0.4 to 1.0 percent, and 15-bar moisture content of 5 to 10 percent (air dry). The particle-size control section averages 15 to 27 percent clay, 20 to 50 percent sand and 35 to 70 percent basalt gravel, cobbles and stones. Base saturation is 60 to 90 percent in the Bw horizon. Reaction ranges from slightly acid to strongly acid.
The A horizon has hue of 10YR or 7.5YR, value of 4 through 6 dry, 3 through 5 moist and chroma of 1 through 4 dry or moist.
The Bw horizon has hue of 10YR or 7.5YR, value of 4 through 6 dry, 3 or 4 moist and chroma of 3 or 4 dry or moist. Texture is ashy loam or ashy silt loam and averages 35 to 70 percent basalt gravel, cobbles and stones.
The 2BC horizon has hue of 10YR or 7.5YR, value of 5 or 6 dry, 3 or 4 moist and chroma of 3 or 4 dry or moist. Texture is loam or silt loam and has 35 to 75 percent basalt gravel, cobbles and stones.
COMPETING SERIES: These are the Analulu, Ardenvoir, Blinn, Brevco, Coxit, Easte, Highhorn, Huntrock, Jimbluff, Kamela, Lekrem , Longort, Noil, Ontrail, Radercreek, Redpeak, Santop, Seeburg and Thout series. Analulu, Blinn, Brevco, Huntrock, Kamela, Redpeak, Santop and Thout soils are 20 to 40 inches deep to bedrock. Ardenvoir, Easte, and Noil soils have a paralithic contact at 40 to 60 inches. Coxit soils have more than 50 percent sand, and have sandy loam textures in the control section.. Jimbluff soils have 2 to 6 percent clay and sandy loam and coarse sandy loam textures in the control section. Highhorn and Radercreek soils are 40 to 60 inches deep to bedrock. Lakrem soils have 3 to 8 percent clay and sandy loam textures in the control section. Longort soils have a densic contact at 25 to 40 inches. Ontrail soils have 5 to 12 percent clay in the control section and hue of 5YR or 7.5YR throughout. Seeburg soils have 4 to 7 percent clay in the control section and 5 to 15 percent pumice fragments in the upper part of the solum.
GEOGRAPHIC SETTING: Jumpe soils are on convex mountain backslopes, smooth mountain summits and ridges. Slopes are 0 to 90 percent. The soils formed in residuum and colluvium from Yakima basalt with minor amounts of loess and volcanic ash in the upper part. Elevation is 2,800 to 5,800 feet. These soils are in a climate with warm, moderately dry summers and cool, moist winters. The average annual precipitation is 18 to 45 inches. The average January temperature is about 24 degrees F; average July temperature is about 64 degrees F; and average annual temperature is about 42 to 45 degrees F. The frost-free season is 70 to 115 days. The growing season at 28 degrees F is 135 to 170 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bocker, Loneridge, Sapkin, Stemilt, and Sutkin soils. Bocker soils are on plateaus and are less than 10 inches deep to a lithic contact. Loneridge soils are on ridges, are clayey-skeletal, and have an argillic horizon. Sapkin soils are on mountain side slopes and are 20 to 40 inches deep to a lithic contact and have a mollic epipedon. Stemilt soils are on mountains and have a mollic epipedon and an argillic horizon. Sutkin soils are on mountain side slopes and have a mollic epipedon.
DRAINAGE AND PERMEABILITY: Well drained; very slow to very rapid runoff; moderate permeability.
USE AND VEGETATION: Timber production, wildlife habitat, recreation, and watershed. Vegetation is Douglas-fir, western larch, ponderosa pine, lodgepole pine and grand fir with an understory of pinegrass, elk sedge, lupine, ceanothus, and Oregon-grape.
DISTRIBUTION AND EXTENT: East slopes of the Cascade Mountains in north-central Washington; MLRA 3 and 6. The series is moderately extensive.
MLRA OFFICE RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Chelan County Area, Washington, 1971.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - from 2 to 4 inches (A horizon)
Cambic horizon - from 4 to 28 inches (Bw1 and Bw2 horizons)
Vitrandic subgroup feature - from 2 to 28 inches
Particle-size control section - from 10 to 40 inches (lower Bw1, Bw2, and upper 2BC horizons)
All depths to diagnostic horizons and features found in the range of characteristics are measured from the top of the first mineral layer.
ADDITIONAL DATA: S76WA-037-3-1, 2, 3, Riverside Lab; S90WA-077-005, S90WA-077-006 (taxadjunct), S90WA-077-008, and S80WA-037-008, NSSL, Lincoln NE.