LOCATION HOOPGOBEL ID
Established Series
Rev. BJD-DLM-RJS
01/2023
HOOPGOBEL SERIES
The Hoopgobel series consists of moderately deep, well drained soils formed in alluvium over weakly consolidated ash, tuffaceous siltstone or tuffaceous sandstone. These soils are on hillslopes and mountain slopes on north-facing aspects. Permeability is moderately slow. Slopes are 15 to 35 percent. The average annual precipitation is about 16 inches and the average annual temperature is about 39 degrees F.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive Pachic Argicryolls
TYPICAL PEDON: Hoopgobel loam, rangeland; on a 22 percent slope at an elevation of 6,200 feet. (Colors are for dry soil unless otherwise stated.)
A--0 to 4 inches; very dark grayish brown (10YR 3/2) loam, very dark brown (10YR 2/2) moist; moderate fine granular structure; soft, friable, slightly sticky and slightly plastic; many very fine and fine and few medium and coarse roots; 5 percent gravel; neutral (pH 7.0); clear smooth boundary. (4 to 5 inches thick)
AB--4 to 9 inches; very dark grayish brown (10YR 3/2) gravelly loam, very dark brown (10YR 2/2) moist; moderate fine subangular blocky structure; soft, friable, slightly sticky and slightly plastic; many very fine and fine and few medium roots; 15 percent gravel; neutral (pH 7.0); clear wavy boundary. (4 to 6 inches thick)
Bt1--9 to 18 inches; very dark grayish brown (10YR 3/2) gravelly clay loam, very dark brown (10YR 2/2) moist; strong medium angular blocky structure; hard, firm, moderately sticky and moderately plastic; common very fine and fine and few medium roots; common faint continuous clay films on faces of peds and in pores; 15 percent gravel; neutral (pH 7.2); clear smooth boundary. (4 to 9 inches thick)
Bt2--18 to 24 inches; dark grayish brown (10YR 4/2) gravelly clay loam, dark brown (10YR 3/3) moist; strong medium prismatic structure; very hard, firm, moderately sticky and moderately plastic; common very fine and fine and few medium roots; common distinct continuous clay films on faces of peds and in pores; 15 percent gravel and 5 percent paragravel; neutral (pH 7.2); clear wavy boundary. (6 to 12 inches thick)
Btk--24 to 28 inches; grayish brown (10YR 5/2) paragravelly clay loam, dark grayish brown (10YR 4/2) moist; moderate medium subangular blocky structure; very hard, firm, moderately sticky and moderately plastic; few very fine and fine roots; common faint discontinuous clay films on faces of peds and in pores; lime is present as thin coats on bottoms of paragravels; 15 percent paragravel; slightly alkaline (pH 7.8); clear wavy boundary. (2 to 6 inches thick)
2Cr--28 to 60 inches; light gray (2.5Y 7/1) weakly consolidated ash; some lime in upper platy cracks.
TYPE LOCATION: Bear Lake County, Idaho; about 2 miles west of Bennington, Idaho; about 2,850 feet east and 2,660 feet south of the northwest corner of section 1, T. 12 S., R. 43 E. (42 degrees 24 minutes 29.8 seconds North Latitude and 111 degrees 22 minutes 31.5 seconds West Longitude)
RANGE IN CHARACTERISTICS:
Soil moisture control section usually moist, dry in all parts for 45 consecutive days or more in the four months following the summer solstice. Xeric moisture regime.
Thickness of mollic epipedon 16 to 25 inches
Depth to paralithic contact 20 to 40 inches
Average annual soil temperature 39 to 42 degrees F. Cryic soil temperature regime.
Average annual summer soil temperature 54 to 59 degrees
Particle-size control section
Clay content 24 to 33 percent
Rock fragments 5 to 20 percent gravel and 0 to 5 percent cobbles
Para rock fragments 0 to 20 percent
A horizon
Value 3 dry and 2 moist
Clay content 16 to 20
Rock fragments 0 to 10 percent gravel
Reaction neutral (pH 6.6 to 7.3)
AB horizon
Value 3 dry and 2 moist
Textures loam, gravelly loam
Clay content 16 to 20 percent
Rock fragments 0 to 15 percent gravel
Reaction neutral (pH 6.6 to 7.3)
Bt horizons
Value 3 or 4 dry, 2 or 3 moist
Chroma 2 or 3 dry or moist
Textures clay loam, gravelly clay loam
Clay content 27 to 33 percent
Rock fragments 5 to 20 percent gravel and 0 to 5 percent cobbles
Para rock fragments 0 to 15 percent in lower part
Reaction neutral (pH 6.6 to 7.3)
Btk horizon
Value 5 or 6 dry, 4 or 5 moist
Chroma 2 or 3 dry or moist
Textures clay loam, gravelly clay loam, paragravelly clay loam, gravelly loam
Clay content 24 to 30 percent
Rock fragments 0 to 15 percent gravel
Para rock fragments 5 to 20 percent
Calcium carbonate equivalent 5 to 15 percent
Reaction slightly alkaline to moderately alkaline (pH 7.4 to 8.4)
COMPETING SERIES: These are the
Bachus,
Bavdark,
Benteen,
Brushtop (T),
Clayburn,
Croydon,
Crystalbutte,
Davtone,
Dehana,
Demast,
Dranburn,
Dranyon,
Echemoor,
Hagenbarth,
Millerlake,
Odark (T),
Pontuge,
Senchert,
Southmount,
Poodle,
Stubbs,
Thulepah,
Vadnais, and
Winu series. Bachus, Benteen, Echemor, Senchert, Vadnais and Winu soils are 20 to 40 inches to a lithic contact. Brushtop soils are 40 to 60 inches to a paralithic contact. Odark soils are very deep. Poodle soils do not have a Btk horizon and have average annual soil temperature of 43 to 47 degrees F. Stubbs soils are in an ustic moisture regime. Poodle soils lack paragravels consisting of weakly consolidated ash. Bavdark, Clayburn, Crystalbutte, Davtone, Dehana, Demast, Dranburn, Hagenbarth, Millerlake, Pontuge, Southmount, and Thulepah soils are very deep. Croydon and Dranyon soils have a lithic contact at a depth of 40 to 60 inches.
GEOGRAPHIC SETTING:
Landform: hillslopes and mountain slopes on north-facing aspects
Elevation: 6,000 to 7,150 feet
Slope: 10 to 40 percent
Parent Material: alluvium over weakly consolidated ash, tuffaceous siltstone, or tuffaceous sandstone
Climate: long, cool winters; dry, warm summers
Average annual precipitation: 14 to 22 inches
Average annual temperature: 37 to 43 degrees F.
Frost-free season: 50 to 70 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Brushtop (T),
Cadero (T), and
Redpine (T) soils. Brushtop soils are 40 to 60 inches to a paralithic contact on north-facing slopes. Cadero soils are shallow to weakly consolidated ash on shoulders and summits. Redpine soils have a warmer soil temperature regime on mostly west-facing backslopes and shoulders.
DRAINAGE AND PERMEABILITY: Well drained, moderately slow permeability
USE AND VEGETATION: These soils are used mainly for wildlife habitat and rangeland. The dominant native vegetation is mountain big sagebrush, common snowberry, serviceberry, Idaho fescue, bluegrass, prairie junegrass, and common yarrow.
DISTRIBUTION AND EXTENT: Southeastern Idaho. The soils are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Bear Lake County, Idaho, 2008. The name is from a nearby spring.
REMARKS: Depths to diagnostic horizons and features start from the mineral soil surface. Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon: the zone from 0 to 24 inches (A, AB, Bt1 and Bt2 horizons)
Argillic horizon: the zone from 9 to 28 inches (Bt1, Bt2 and Btk horizons)
Paralithic contact: 28 to 38 inches (2Cr horizon)
Particle-size control section: the zone from 9 to 28 inches (Bt1, Bt2, and Btk horizons)
National Cooperative Soil Survey
U.S.A.