LOCATION OUTLET ID+WYEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive Aquic Haplocryolls
TYPIFYING PEDON: Outlet silty clay loam, native pasture. (Colors are for dry soil unless otherwise noted.)
A11--0 to 8 inches; very dark gray (10YR 3/1) silty clay loam, black (10YR 2/1) moist; strong medium granular structure; hard, firm, sticky, plastic; many very fine and fine roots; many very fine tubular pores; few uncoated silt particles; noncalcareous; mildly alkaline (pH 7.4); gradual smooth boundary. (5 to 10 inches thick)
A12--8 to 16 inches very dark gray (10YR 3/1) (dark gray, 10YR 4/1 crushed) siltly clay loam, black (10YR 2/1) moist; weak coarse prismatic structure that parts to strong medium granular structure; hard, firm, sticky, plastic; common very fine and fine roots; many very fine tubular pores; few uncoated silt particles; noncalcareous; mildly alkaline (pH 7.4); clear wavy boundary. (5 to 9 inches thick)
C1ca--16 to 24 inches; pinkish gray (7.5YR 7/2) clay loam, brown (7.5YR 5/3) moist; weak coarse subangular blocky and weak very fine and fine granular structure; hard, friable, sticky, plastic; common very fine and fine roots; many very fine and fine tubular pores; strongly calcareous; many fine soft spots of calcium carbonate; moderately alkaline (pH 8.2); clear wavy boundary. (6 to 12 inches thick)
C2ca--24 to 36 inches; light reddish brown (5YR 6/3) (pink, 5YR 7/3 crushed) light clay loam, reddish brown (5YR 4/4) moist; few medium faint reddish brown (5YR 5/4) mottles; weak medium subangular blocky structure that parts to weak medium granular structure; hard, friable, sticky, blocky structure that parts to weak medium granular structure; hard, friable, sticky, plastic; common very fine and fine roots; many very fine and fine tubular pores; few fine firm nodules strongly calcareous, many fine soft spots and coatings of calcium carbonate; moderately alkaline (pH 8.0); gradual smooth boundary. (10 to 20 inches thick)
IIC3ca--36 to 46 inches; light reddish brown (5YR 6/3) heavy loam, reddish brown (5YR 4/4) moist; few medium faint reddish brown (5YR 5/4) mottles; massive; hard, friable, slightly sticky, slightly plastic; few very fine and fine roots; many very fine and fine tubular pores; few fine firm nodules; few dark gray, soft iron-manganese concretions and stains less than 2mm in diameter; strongly calcareous, common fine lime veins and spots; mildly alkaline (pH 7.8); gradual smooth boundary. (0 to 14 inches thick)
IIC4--46 to 57 inches; light brown (7.5YR 6/3) loam, brown (7.5YR 4/4) moist; common medium faint strong brown (7.5YR 5/6) mottles; massive; hard, friable, slightly sticky, slightly plastic; brown (7.5YR 5/6) mottles; massive; hard, friable, slightly sticky, slightly plastic; few very fine roots; common very fine tubular pores; common fine firm nodules; common dark gray soft iron-manganese concretions and stains less than 2mm in diameter; moderately calcareous; mildly alkaline (pH 7.6); gradual wavy boundary. (0 to 15 inches thick)
IIC5--57 to 80 inches; light brown (7.5YR 6/4) loam, brown (7.5YR 4/3) moist; few fine reddish yellow (7.5YR 6/6) mottles; massive; hard, firm, slightly sticky, slightly plastic; few very fine roots; common very fine tubular pores; common dark gray soft iron-manganese concretions less than 2mm in diameter; moderately calcareous; mildly alkaline (pH 7.8); (0 to 30 inches thick)
TYPE LOCATION: Bonneville County, Idaho; 2,600 feet west and 2,250 feet north of the SE corner of sec. 20, T.3S., R.43E.; about 3/4 mile west of Herman in a lake terrace having less than 1 percent slope and elevation of 6,300 feet.
RANGE IN CHARACTERISTICS: The mean annual soil temperature ranges from 35 degrees to 42 degrees F., and the mean summer soil temperature at a depth of 20 inches range from 50 degrees to 59 degrees F. The soils are saturated throughout for short periods of 10 to 30 days in spring and early summer, bit they ar saturated at some level between depths of 20 and 40 inches for 3 to 5 months during spring and summer. The 10 to 40 inch control section is dominantly moderately fine textured and contains 27 to 35 percent clay, more than 15 percent particles coarser than very fine sand and less than 15 percent rock fragments. The mollic epipedon (and solum) is 10 to 16 inches thick. The A1 (or Ap) horizon has hue of 10YR or 2.5Y, value of 2.5 through 4 dry and 1 to 2.5 moist, and chroma of 0.5 to 1.5. It has strong or moderate granular structure. To a depth of 8 inches or deeper, it is noncalcareous and neutral or mildly alkaline. The Cca horizon has hue of 7.5YR or 5YR, value of 6 or 7 dry and 4 or 5 moist and chroma of 2 through 4. It has weak subangular blocky structure or the soil is massive. Mottles due to segregations of iron and manganese are in one or more subhorizon between depths of 20 and 40 inches. A subhorizon of the Cca horizon from 10 to 40 inches thick contains 15 to 35 percent calcium carbonate.
COMPETING SERIES AND THEIR DIFFERENTIAE: These are the Cedron, Conda, Enochville, Furniss, Gallatin, Slocum, Tonks, and Zufelt series. Cedron, Conda, Enochville, Furniss, Tonks, and Zufelt soils are saturated throughout for a period or are drained. Cedron soils have a strongly calcareous A1 horizon and 40 to 80 percent carbonates in the Cca horizon. Conda soils have a strongly calcareous A1 horizon more than 20 inches thick and cemented layers of tufa above a depth of 40 inches. Enochville and Furniss soils are mainly noncalcareous, and Enochville soils have a mollic epipedon thicker than 20 inches. Gallatin soils have a calcareous A1 horizon thicker than 16 inches. Slocum soils have hue of 10YR or 2.5Y and are noncalcareous. Tonks soils have less than 15 percent calcium carbonate in the Cca horizon. Zufelt soils have mottles in and immediately below the mollic epipedon and have loose sand and gravel above a depth of 40 inches.
SETTING: The soils re on level lake or stream terraces of bottomlands at elevations of 5,500 to 7,000 feet. Slopes range from 0 to 4 percent. The soils formed in moderately fine and medium textured alluvium or lacustrine sediments. The material is dominantly from sedimentary rock sources but contains minor rhyolitic, basaltic, and granitic materials. The subhumid climate has mean annual precipitation of 16 to 19 inches. Most areas receive additional moisture as runoff from nearby areas. Mean annual snowfall ranges from 7 to 12 feet. Summer showers are common. The mean freeze-free period ranges from 50 to 80 days.
PRINCIPAL ASSOCIATED SOILS: These are the competing Enochville soils and the Lanark, Robin, and Sessions soils. Lanark, Robin, and Sessions soils are well drained and have argillic horizons.
DRAINAGE AND PERMEABILITY: Some hat poorly drained; slow runoff; moderately slow permeability. The water table is at depths of 20 to 40 inches for short periods in spring and early summer, but drops to depths of 45 to 50 inches in late summer.
USE AND VEGETATION: Used mainly for pasture and range, but some areas are cropped to small grains and legumes. The principal native plants are Kentucky bluegrass, sedges, hairgrass, bull thistle, Nevada bluegrass, Idaho fescue, wiregrass, potentilla, and silver sagebrush.
DISTRIBUTION AND EXTENT: Moderately extensive in the high valleys and stream bottoms in southeastern Idaho.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Bonneville County, Idaho, 1972.
REMARKS: The soils were classified formerly as Calcium Carbonate Solonchak soils.