LOCATION COLLISTER IDEstablished Series
The Collister series consists of very deep, moderately well drained soils with moderate permeability that formed in alluvium from mixed sediments and igneous rocks. Slopes range from 1 to 3 percent in valleys. The average annual precipitation is about 14 inches and the average annual temperature is about 51 degrees F.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Cumulic Haploxerolls
TYPICAL PEDON: Collister loam -- on a nearly level stream terrace at 2,720 feet elevation in fallowed cropland. When described on August 26, 1995, the soil was dry to 31 inches and slightly moist below. (Colors are for air-dry soil unless otherwise noted.)
Ap1--0 to 4 inches; grayish brown (10YR 5/2) loam, very dark grayish brown (10YR 3/2) moist; weak medium and thick platy structure parting to moderate fine and medium granular; soft, very friable, slightly sticky and slightly plastic; many very fine and fine, few medium roots; many very fine and fine irregular pores; 5 percent gravel; neutral (pH 7.1); clear smooth boundary. (2 to 10 inches thick)
Ap2--4 to 10 inches; dark grayish brown (10YR 4/2) loam, very dark grayish brown (10YR 3/2) moist; weak fine subangular blocky structure; hard, very friable, slightly sticky and slightly plastic; common very fine and fine, few medium roots; many very fine and fine tubular pores; 5 percent gravel; neutral (pH 7.0); gradual wavy boundary. (2 to 8 inches thick)
A1--10 to 19 inches; grayish brown (10YR 5/2) loam, very dark grayish brown (10YR 3/2) moist; weak fine and medium subangular blocky structure; slightly hard, very friable, slightly sticky and nonplastic; common very fine and fine roots; common very fine and fine tubular pores; neutral (pH 6.8); clear smooth boundary. (2 to 13 inches thick)
A2--19 to 23 inches; grayish brown (10YR 5/2) loam, very dark grayish brown (2.5Y 3/2) moist; moderate thin platy parting to moderate fine subangular blocky; hard, very friable, moderately sticky and moderately plastic; common very fine and fine roots; many very fine and fine tubular pores; neutral (pH 6.7); clear wavy boundary. (2 to 9 inches thick)
Bw1--23 to 28 inches; grayish brown (10YR 5/2) clay loam, very dark grayish brown (10YR 3/2) moist; moderate fine subangular blocky structure; hard, friable, very sticky and moderately plastic; few very fine and fine roots; common very fine and fine tubular pores; 5 percent gravel; neutral (pH 6.8); clear wavy boundary. (4 to 12 inches thick)
Bw2--28 to 36 inches; dark grayish brown (10YR 4/2) silty clay loam, very dark gray (10YR 3/1) moist; moderate fine and medium subangular blocky structure; hard, friable, very sticky and very plastic; few very fine and fine roots; common very fine and fine tubular pores; few distinct dark yellowish brown (10YR 4/4 moist) Fe masses and many prominent dark grayish brown (10YR 4/2 moist) silt coatings on faces of peds; neutral (pH 6.6); clear smooth boundary. (4 to 12 inches thick)
Bw3--36 to 42 inches; dark grayish brown (10YR 4/2) silt loam, very dark gray (10YR 3/1) moist; moderate fine subangular blocky structure; hard, friable, moderately sticky and moderately plastic; few very fine and fine roots; many very fine and fine, common medium tubular pores; few faint dark yellowish brown (10YR 4/4 moist) Fe masses; few distinct manganese concretions; neutral (pH 6.8); clear wavy boundary. (3 to 8 inches thick)
Bw4--42 to 58 inches; dark gray (10YR 4/1) sandy clay loam, black (10YR 2/1) moist; moderate medium and coarse subangular blocky structure; hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; many very fine and fine irregular pores; few faint dark yellowish brown (10YR 4/4 moist) Fe masses; 5 percent gravel; neutral (pH 6.7); clear wavy boundary. (7 to 16 inches thick)
C--58 to 68 inches; brown (10YR 5/3) sandy loam, very dark grayish brown (10YR 3/2) moist; massive; hard, very friable, slightly sticky and slightly plastic; few very fine and fine roots; many very fine and fine irregular pores; few faint dark yellowish brown (10YR 4/4 moist) Fe masses; 5 percent gravel; slightly acid (pH 6.4).
TYPE LOCATION: Ada County, Idaho; about 2.5 miles east and 3 miles north of Eagle; 350 feet north and 2,300 feet west of the southeast corner of section 26, T.5 N., R.1 E.; USGS Pearl Quadrangle; Latitude - 43 degrees, 44 minutes, 12 seconds N. and Longitude - 116 degrees, 18 minutes, 12 seconds W.; NAD 83.
RANGE IN CHARACTERISTICS:
Mollic epipedon thickness - 20 to 60 inches
Organic carbon content - 1 to 3 percent which decreases irregularly with depth
Solum thickness - greater than 40 inches
Depth to bedrock - 60 inches or more
Depth to redoximorphic features - 24 to 48 inches
Reaction - neutral or slightly acid
Particle-size control section - 22 to 30 percent clay; 0 to 10 percent gravel
Moisture control section - moist less than 90 consecutive days when the soil temperature is greater than 47 degrees F.
Average annual soil temperature - 51 to 53 degrees F.
Ap horizon
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 2 or 3 dry or moist
Clay content - 18 to 25 percent
Rock fragments - 0 to 5 percent gravel
A horizon
Hue - 10YR or 2.5Y
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 2 or 3 dry or moist
Texture - L or SIL
Clay content - 20 to 27 percent
Rock fragments - 0 to 5 percent gravel
Bw1 horizon
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 2 or 3 dry or moist
Texture - L or CL
Clay content - 25 to 30 percent
Rock fragments - 0 to 5 percent gravel
Bw2 through Bw4 horizons
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 1 or 2 dry or moist
Texture - SICL, SIL or SCL
Clay content - 25 to 30 percent
Rock fragments - 0 to 15 percent gravel
Redoximorphic features - few through many; faint or distinct Fe masses
C horizon
Value - 5 through 7 dry, 3 through 5 moist
Chroma - 2 or 3 dry or moist
Texture - SL, L or CL
Clay content - 15 to 30 percent
Rock fragments - 0 to 15 percent gravel
Redoximorphic features - few or common Fe masses
COMPETING SERIES: These are the Birdow, Blackrock, Coit, Dagor, Eastcan, Goose Creek, Goosenawt, Gosinta, Heidtman, Lakeview, Monroe, Oxy, Shoepeg, Soquel, Willowdale and Winn series. Birdow soils are calcareous to the soil surface and have a xeric soil moisture regime. Blackrock soils are well drained, contain 20 to 35 percent rock fragments in the particle-size control section, and have a Bk horizon. Coit soils are poorly drained and calcareous throughout. Dagor soils have a xeric soil moisture regime, are well drained, and have a solum less than 26 inches thick. Eastcan soils are calcareous throughout, have a xeric soil moisture regime, and mean annual soil temperature of 47 to 51 degrees F. Goose Creek soils are calcareous in some part of the control section. Goosenawt soils have mean annual soil temperature of 47 to 51 degrees F, are mildly or moderately alkaline, and do not have redoximorphic concentrations. Gosinta soils have a solum less than 40 inches thick. Heidtman soils have a calcareous horizon in the control section with SAR of 13 to 30. Lakeview soils do not have redoximorphic features, are somewhat poorly drained, have a solum less than 40 inches thick, and have 2Btb horizons. Monroe soils are well drained, are slightly alkaline or moderately alkaline in the control section and do not have Bg horizons. Oxy soils are 20 to 40 inches deep to a lithic contact. Shoepeg soils are somewhat poorly drained and have a solum less than 40 inches thick. Soquel soils have average annual soil temperature of 56 to 58 degrees F., a solum less than 40 inches thick and buried A horizons. Willowdale soils have Ak horizons, are calcareous throughout, and have 10 to 20 percent pumice sands. Winn soils are somewhat poorly drained and slightly or moderately alkaline throughout.
GEOGRAPHIC SETTING: Collister soils are on upper flood-plain steps at elevations of 2,700 to 3,750 feet. Slopes range from 1 to 3 percent. These soils formed in alluvium from mixed sediments (Tertiary) and igneous rocks. The average annual precipitation is 12 to 16 inches. The average annual temperature is 49 to 51 degrees F. The frost-free period is 130 to 150 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Flofeather soils. Flofeather soils are coarse-loamy, somewhat excessively drained and occur on the same landform as the Collister soils.
DRAINAGE AND PERMEABILITY: Moderately well drained with a seasonal high water table from 40 to 70 inches during the months of March through June; slow runoff; moderate permeability. Collister soils are subject to rare flooding for brief periods in December through May.
USE AND VEGETATION: Collister soils are used mainly for irrigated hayland/pasture. Small areas are used for rangeland and homesites. Native vegetation is basin big sagebrush and basin wildrye.
DISTRIBUTION AND EXTENT: Southwestern and west-central, Idaho.
MLRA 10 and 11. Collister soils are of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Boise County Area, Idaho, Parts of Ada and Boise Counties, 2005
REMARKS: Diagnostic horizons and features recognized in this pedon:
Mollic epipedon - zone from the surface to 58 inches (Ap1, Ap2, A1, A2 Bw1, Bw2, Bw3, and Bw4 horizons)
Particle-size control section - zone from 10 to 40 inches
Redoximorphic features - zone from 28 to 68 inches (Bw2, Bw3, Bw4 and C horizons)
Redox concentrations in the upper part of this zone are relict features. The landscape has had significant drainage entrenchment and lowering of the water table.
Soil moisture regime - aridic bordering on xeric
These soils are drier than other Xerolls in the region under similar precipitation due to early runoff and extended period of high evapotranspiration.