LOCATION JIMCREEK WAEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, frigid Typic Argiaquolls
TYPICAL PEDON: Jimcreek silt loam - on a northeast facing 5 percent slopes, at 2,900 feet elevation, under a mixed canopy of quaking aspen and ponderosa pine. (Colors are for dry soil unless otherwise stated.)
Oi--0 to 1 inch; leaves, needles, twigs, branches.
A1--1 to 5 inches; dark gray (10YR 4/1) silt loam, black (10YR 2/1) moist; moderate fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine, fine, and medium roots; neutral (pH 6.8); clear wavy boundary.
A2--5 to 20 inches; gray (10YR 5/1) silt loam, very dark gray (10YR 3/1) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine, fine, medium, and coarse roots; neutral (pH 6.8); clear wavy boundary. (Combined thickness of the A horizon is 16 to 20 inches thick)
2Btg1--20 to 37 inches; light gray (2.5Y 7/2) silty clay loam, grayish brown (2.5Y 5/2) moist; few fine faint light brownish gray (2.5Y 6/2) redox depletions; moderate medium angular blocky structure; hard, firm, slightly sticky and slightly plastic; common very fine, fine, and few medium roots; many faint clay films on face of peds and lining pores; 2 percent fine pebbles; neutral (pH 7.0); clear wavy boundary.
2Btg2--37 to 47 inches; light gray (2.5Y 7/2) silty clay loam, grayish brown (2.5Y 5/2) moist; common fine distinct light yellowish brown (2.5Y 6/4) redox concentrations, light olive brown (2.5Y 5/4) moist; moderate medium angular blocky structure; hard, firm, slightly sticky and slightly plastic; few very fine and fine roots; many distinct clay films on faces of peds and lining pores; 2 percent fine pebbles; neutral (pH 7.0); clear wavy boundary. (Combined thickness of the 2Btg1 and 2Btg2 horizon is 23 to 29 inches thick)
2Btg3--47 to 60 inches; light gray (5Y 7/2) silty clay loam, grayish brown (2.5Y 5/2) moist; common medium prominent pale brown (10YR 6/3) and brown (10YR 4/3) moist redox concentrations and common medium distinct gray (5Y 6/1) redox depletions, dark gray (5Y 4/1) moist; moderate medium angular blocky structure; very hard, firm, moderately sticky and moderately plastic; many distinct clay films on faces of peds and lining pores; 3 percent pebbles; neutral (pH 7.0).
TYPE LOCATION: Colville Indian Reservation; Okanogan County, Washington; about 3 miles southeast of the town of Disautel; 1,400 feet north, 700 feet west of the southeast corner of sec. 28, T. 33 N., R. 29 E., W.M.
RANGE IN CHARACTERISTICS: The mean annual soil temperature at a depth of 20 inches is 44 to 46 degrees F. These soils are usually saturated from January through June but are dry between depths of 4 and 12 inches for 30 to 45 consecutive days following the summer solstice. Depth to the seasonal high water table in winter and early spring is 0.5 feet to 2.0 feet below the mineral soil surface. Thickness of the mollic epipedon is 16 to 20 inches. The particle-size control section contains an average of 25 to 35 percent clay and less than 15 percent fine sand or coarser with 0 to 3 percent coarse fragments.
The A horizon has value of 4 or 5 dry, 2 or 3 moist, and chroma of 1 or 2 dry or moist.
The 2Btg1 and 2Btg2 horizons have hue of 10YR or 2.5Y, value of 6 or 7 dry, 4 or 5 moist. They are silt loam or silty clay loam, and are 0 to 3 percent pebbles.
The 2Btg3 horizon has hue of 2 .5Y or 5Y, value of 6 or 7 dry, 4 or 5 moist, and chroma of 1 or 2, dry or moist. It is silty clay loam or silty clay and is 0 to 5 percent pebbles.
COMPETING SERIES: This is the Cloverland series in another family. Cloverland soils have an albic horizon and a xeric moisture regime.
GEOGRAPHIC SETTING: Jimcreek soils are in depressions on glaciolacustrine terraces and plains. These soils formed in glaciolacustrine sediments and recent alluvium mixed with volcanic ash. Slopes are 0 to 5 percent. Elevations range from 1,600 to 3,100 feet. The climate is characterized by warm, dry summers and cold, moist winters. The average annual precipitation is 16 to 18 inches. The mean January temperature is about 23 degrees F, the mean July temperature is about 64 degrees F, and the mean annual air temperature is about 43 degrees F. The frost-free period is 90 to 120 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Anglen, Kewach, Nevine, Neuske, Republic, Ret, and Uncas soils. Anglen and Kewach soils are fine and moderately well drained. Nevine soils are ashy over loamy-skeletal. Neuske soils are fine-loamy. Republic and Ret soils are coarse-loamy. Uncas soils are ashy and very poorly drained.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; very slow to slow runoff; permeability is moderately slow.
USE AND VEGETATION: Timber production, grazing, wildlife habitat, hay and pasture, and watershed are the principal uses. The native vegetation is ponderosa pine, Douglas-fir, quaking aspen, and western larch, with an understory of pinegrass, common snowberry, dwarf rose, fat false-Solomons-seal, common chokecherry, Saskatoon serviceberry, bluegrass, bedstraw, and spreading sweetroot.
DISTRIBUTION AND EXTENT: Northcentral Washington. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Colville Indian Reservation; Ferry County, Washington, 1987.
REMARKS: Diagnostic horizons and features recognized in this soil are a mollic epipedon from the mineral soil surface to 20 inches and an argillic horizon from 20 to 60 inches which is gleyed. The particle-size control section averages 2 percent coarse fragments.