LOCATION CHESBROOK IDEstablished Series
TAXONOMIC CLASS: Fine-silty, carbonatic, frigid Typic Calciaquolls
TYPICAL PEDON: Chesbrook silt loam, non-irrigated pasture; on a 0.5 percent slope at 5,340 feet elevation. When described on October 24, 1988 the soil was dry throughout the profile. (Color is for air dry soil unless otherwise noted.)
Oi--0 to 2 inches; yellowish brown (10YR 5/4) slightly decomposed organic material, dark brown (10YR 3/3) moist; many very fine and common fine roots; slightly effervescent; strongly alkaline (pH 8.7); abrupt smooth boundary. (0 to 3 inches thick)
Akg1--2 to 13 inches; light brownish gray (10YR 6/2) silt loam, very dark gray (10YR 3/1) moist; weak coarse subangular blocky structure parting to moderate medium subangular blocky; slightly hard, very friable, moderately sticky and moderately plastic; common very fine and fine roots; common very fine tubular pores; violently effervescent (35 percent calcium carbonate equivalent); strongly alkaline (pH 8.8); gradual smooth boundary. (6 to 13 inches thick)
Akg2--13 to 20 inches; light brownish gray (10YR 6/2) silt loam, very dark gray (10YR 3/1) moist; many faint redox concentrations slightly lighter than soil matrix; weak medium subangular blocky structure parting to strong very fine granular; slightly hard, very friable, moderately sticky and moderately plastic; common very fine and fine roots; many very fine tubular pores; violently effervescent (35 percent calcium carbonate equivalent); strongly alkaline (pH 8.7); gradual wavy boundary. (5 to 8 inches thick)
Bkg1--20 to 31 inches; light brownish gray (10YR 6/2) silt loam, very dark gray (10YR 3/1) moist; many faint redox concentrations slightly lighter than the soil matrix; weak coarse subangular blocky structure parting to weak medium subangular blocky; slightly hard, very friable, moderately sticky and moderately plastic; common very fine and few fine roots; many very fine tubular pores; strongly effervescent (45 percent calcium carbonate equivalent); strongly alkaline (pH 8.6); gradual wavy boundary. (9 to 11 inches thick)
Bkg2--31 to 36 inches; light brownish gray (10YR 6/2) silt loam, dark gray (10YR 4/1) moist; many faint redox concentrations slightly lighter than the soil matrix; massive; soft, very friable, slightly moderately sticky and slightly plastic; few very fine and fine roots; many very fine tubular pores; strongly effervescent (75 percent calcium carbonate equivalent); strongly alkaline (pH 8.6); gradual wavy boundary. (4 to 8 inches thick)
Bkg3--36 to 48 inches; light gray (2.5Y 7/2) silt loam, light brownish gray (2.5Y 6/2) moist; about 2 percent yellow (2.5Y 7/6) staining in root channels; massive; hard, very friable, moderately sticky and moderately plastic; few very fine and fine roots; many very fine and few fine tubular pores; strongly effervescent (45 percent calcium carbonate equivalent); strongly alkaline (pH 8.6); clear wavy boundary. (6 to 12 inches thick)
2Ckg1--48 to 56 inches; white (5Y 8/1) silt loam, light brownish gray (2.5Y 6/2) moist; 2 percent snail shells; few fine prominent olive yellow (2.5Y 6/6) redox concentrations; massive; hard, very friable, moderately sticky and moderately plastic; few very fine and fine roots; common very fine and few fine tubular pores; 25 percent 5/8 inch by 1/4 inch lime nodules; 3 percent gravel; strongly effervescent (40 percent calcium carbonate equivalent); strongly alkaline (pH 8.6); clear smooth boundary. (5 to 26 inches thick)
2Ckg2--56 to 62 inches; pale yellow (5Y 8/3) silt loam, olive (5Y 5/3) moist; common prominent fine olive yellow (2.5Y 6/6) and few fine prominent light olive brown (2.5Y 5/4) redox concentrations moist; massive; hard, very friable, slightly sticky and slightly plastic; few very fine and fine roots; common very fine tubular pores; 30 percent 5/8 inch by 1/4 inch lime nodules; slightly effervescent (25 percent calcium carbonate equivalent); strongly alkaline (pH 8.6).
TYPE LOCATION: Caribou County, Idaho; about 1 1/2 miles SE of Chesterfield Reservoir; 0.5 percent northwesterly slope at 5,340 feet elevation; 1,200 feet east and 700 feet north of the southwest corner of sec. 29, T.6S., R.39E. Latitude - 42 degrees, 51 minutes, 50 seconds N; Longitude - 111 degrees, 55 minutes, 11 seconds W.
RANGE IN CHARACTERISTICS:
All depths to diagnostic horizons and features are measured from the mineral soil surface.
Thickness of mollic epipedon - 8 to 18 inches
Depth to redox concentrations - 10 to 20 inches
Depth to seasonal high water table - 10 to 20 inches from April through June
Average annual soil temperature - 41 to 45 degrees F.
Particle-size control section:
Clay content - averages 18 to 32 percent
Calcium carbonate equivalent - averages 40 to 55 percent
Akg horizons
Hue - 10YR or 2.5Y
Value - 4 through 6 dry, 2 or 3 moist
Chroma - 1 or 2 dry and moist
Effervescence - strong or violent
Reaction - moderately or strongly alkaline
Bkg horizons
Hue - 10YR or 2.5Y
Value - 6 or 7 dry, 4 through 6 moist
Chroma - 1 or 2 dry and moist
Texture - SIL or SICL
Effervescence - strong or violent
Reaction - moderately or strongly alkaline
2Ckg horizons
Hue - 10YR, 2.5Y or 5Y
Value - 6 through 8 dry, 4 through 6 moist
Chroma - 1 or 2 dry, 0 through 3 moist
Texture - SIL or SICL
Effervescence - slight through violent
Reaction - moderately or strongly alkaline
COMPETING SERIES: There are no other soils in this family.
GEOGRAPHIC SETTING: Chesbrook soils are on flood plains, stream terraces or lake terraces. Slopes range from 0 to 2 percent. Elevations range from 4,900 to 6,400 feet. The soil formed in reworked silty alluvium from loessal and alluvial deposits. The average annual precipitation ranges from 13 to 16 inches, the average annual air temperature is 40 to 43 degrees F and the frost free season is 70 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bear Lake, Lago (T), Thatcherflats (T), Wursten and La Roco (T) series. Bear Lake soils occur on lower landscape positions and are not carbonatic. Lago and La Roco soils occur on slightly higher landscape positions and are not carbonatic. Thatcherflats soils occur on higher landscape positions, are not carbonatic, and have a natric horizon. Wursten soils occur on well drained higher landscape positions and are not carbonatic.
DRAINAGE AND PERMEABILITY: Poorly drained; slow runoff; moderately slow permeability; occasional or rare flooding for brief periods April through June.
USE AND VEGETATION: Chesbrook soils are used for non-irrigated and irrigated pasture. The potential natural vegetation is sedges and reeds.
DISTRIBUTION AND EXTENT: Southeastern Idaho. The soils of this series are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Franklin County, Idaho, 1997.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from the surface to 18 inches (Akg1 and Akg2 horizons)
Calcic horizon - the zone from 18 to 46 inches (Bkg1, Bkg2 and Bkg3 horizons)
Aquic moisture regime.
Particle-size control section - the zone from 10 to 40 inches (Part of the Akg1, Akg2, Bkg1, Bkg2 and part of the Bkg3 horizons)
NSSL # S89ID029002 (partial characterization)