LOCATION LONGWAY ID
Established Series
IRD: WGH/TDT
12/2022
LONGWAY SERIES
The Longway series consists of very deep, well drained soils formed in mixed alluvium from rhyolitic tuff, rhyolite and quartzite. Longway soils are on fan remnants and stream terraces and have slopes of 0 to 4 percent. The mean annual precipitation is about 580 mm and the mean annual air temperature is about 3.3 degrees C.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive Pachic Argicryolls
TYPICAL PEDON: Longway silt loam on a stream terrace with 2 percent slope at an elevation of 1,987 meters. (Colors are for dry soil unless otherwise noted.)
A--0 to 15 cm; very dark grayish brown (10YR 3/2) silt loam, black (10YR 2/1) moist; weak fine subangular blocky structure; soft, friable, slightly sticky and slightly plastic; common very fine and fine, and few medium and coarse roots; few very fine tubular pores; neutral (pH 7.2); clear smooth boundary. (10 to 51 cm thick)
Bt1--15 to 41 cm; very dark grayish brown (10YR 3/2) loam, very dark gray (10YR 3/1) moist; weak fine angular blocky structure; slightly hard, firm, slightly sticky and moderately plastic; common very fine and fine and few medium roots; few very fine tubular pores; few faint clay films on faces of peds; neutral (pH 7.2); clear wavy boundary.
Bt2--41 to 53 cm; dark grayish brown (10YR 4/2) clay loam, very dark gray (10YR 3/1) moist; moderate medium and fine angular blocky structure; hard, very firm, moderately sticky and moderately plastic; common very fine and fine roots; few very fine tubular pores; very few faint clay films on faces of peds and in pores; neutral (pH 7.2); clear wavy boundary.
Bt3--53 to 74 cm; brown (10YR 4/3) gravelly clay loam, dark brown (10YR 3/3) moist; moderate medium and fine subangular blocky structure; hard, very firm, moderately sticky and moderately plastic; few fine and medium roots; few very fine tubular pores; few faint clay films on faces of peds and in pores; 20 percent rounded gravel; neutral (pH 6.9); clear wavy boundary. (Combined thickness of the Bt horizons is 35 to 100 cm)
2BC--74 to 107 cm; grayish brown (10YR 5/2) gravelly sandy clay loam, brown (10YR 4/3) moist; moderate fine subangular blocky structure; slightly hard, firm, slightly sticky and slightly plastic; few very fine tubular pores; 20 percent rounded gravel; neutral (pH 6.6); clear smooth boundary. (0 to 36 cm thick)
2C--107 to 157 cm; grayish brown (10YR 5/2) gravelly sandy clay loam, brown (10YR 4/3) moist; massive; soft, friable, slightly sticky and slightly plastic; 30 percent rounded gravel; neutral (pH 6.8).
TYPE LOCATION: Clark County, Idaho, Antelope Valley; about 6.4 km north and 4.9 km east of Kilgore, Idaho; About 614 meters east and 11 meters south of the northwest corner of section 14, T. 13 N., R. 39 E.; Antelope Valley USGS topographic quadrangle; Lat. 44 degrees, 27 minutes, and 36.1 seconds N. and Long. 111 degrees, 49 minutes, and 56.1 seconds W., NAD83.
RANGE IN CHARACTERISTICS:
Mollic epipedon thickness: 45 to 112 cm
Particle size control section average rock fragments: 5 to 25 percent rounded gravel
Particle size control section average clay: 18 to 35 percent
Reaction: moderately acid to slightly alkaline
Mean annual soil temperature: 3.3 to 6.1 degrees C.
Mean summer soil temperature: 11.1 to 14.4 degrees C.
Soil moisture regime: xeric
Soil temperature regime: cryic
A horizon
Hue: 7.5YR or 10YR
Value: 2 to 5 dry, 2 or 3 moist
Chroma: 1 to 3 dry or moist
Reaction: moderately acid to slightly alkaline
Bt horizons
Hue: 7.5YR or 10YR
Value: 3 to 6 dry, 3 to 5 moist
Chroma: 1 to 6 dry or moist
Clay: 18 to 35 percent (increasing with depth)
Fine-earth texture: SIL, SICL, L, CL, with 0 to 30 percent rounded gravel and 0 to 5 percent rounded cobbles
Reaction - moderately acid to slightly alkaline
2BC and 2C horizon (when present)
Hue: 10YR or 7.5YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 2 or 3 dry or moist
Clay: 21 to 30 percent
Fine-earth texture: CL or SCL with 0 to 15 percent rounded cobbles and 20 to 40 percent rounded gravel
Non-effervescent to slightly effervescent (when present): not a result of pedogenic process from overlaying layers
COMPETING SERIES: These are the
Bachus,
Bavdark,
Benteen,
Brushtop,
Clayburn,
Croydon,
Crystalbutte,
Davtone,
Dehana,
Demast,
Dranburn,
Dranyon,
Echemoor,
Hagenbarth,
Hoopgobel,
Lostminer,
Millerlake,
Odark,
Pontuge,
Senchert,
Southmount,
Poodle,
Stubbs,
Thulepah,
Vadnais, and
Winu series. Bachus, Benteen, Echemor, Hoopgobel, Lostminer, Senchert, Poodle, Stubbs, Vadnais, and Winu soils are less than 40 inches deep to lithic or paralithic contact. Bavdark soils have an ustic soil moisture regime. Brushtop and Croydon soils have a lithic or paralithic contact within the series control section. Clayburn soils have a udic moisture regime. Crystalbutte, Dehana, Demast, and Dranyon soils have more than 20 percent rock fragments in the control section. Davtone soils have hues of 5YR. Millerlake and Pontuge soils have pedogenic calcium carbonate layer immediately below the argillic horizon. Dranburn soils have an O horizon and the mean annual summer soil temperature is 9.4 to 11.1 degrees C. Hagenbarth soils have angular rock fragments in the series control section and occur on mountains. Odark soils have an O horizon. Southmount soils have an O horizon and a mean annual soil temperature of less than 3.3 degrees C. Thulepah soils have an mean annual soil temperature greater than 6.1 degrees C.
GEOGRAPHIC SETTING:
Landscape: Mountains
Landform: fan remnants and stream terraces
Elevation: 1,890 to 2,012 meters
Slope: 0 to 4 percent
Parent material: mixed alluvium from rhyolitic tuff, rhyolite and quartzite
Mean annual air temperature: 2.2 to 4.4 degrees C.
Mean annual precipitation: 406 to 610 mm
Frost free period: 45 to 70 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Sudpeak,
Fourme,
Seemore(T) and
Alex series. Fourme and Alex are on similar landforms. The Fourme soil is loamy-skeletal. The Alex soil has a contrasting particle size control section. Sudpeak and Seemore soils are on lower flood plain positions. The Seemore soil is poorly drained and has redoximorphic features. The Sudpeak soil has fine particle size control section and is moderately well drained.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class: Well drained
Runoff: low
Saturated hydraulic conductivity: moderately high
USE AND VEGETATION:
Major uses: These soils are used for rangeland and hayland
Dominant native vegetation: mountain big sagebrush, mountain snowberry, Idaho fescue, mountain brome, slender wheatgrass, mules ear, timothy, arrowleaf balsamroot and lupine
DISTRIBUTION AND EXTENT:
Distribution: Eastern Idaho, MLRA 13.
Extent: The series is not extensive
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Clark County, Idaho, 2018
REMARKS:
Diagnostic horizons and features recognized in this soil are:
Mollic epipedon: From a depth of 0 to 74 cm
Argillic horizon: From a depth of 15 to 107 cm
Particle-size control section: From a depth of 15 to 65 cm
Soil temperature regime: Cryic
Soil moisture regime: Xeric
ADDITIONAL DATA:
Typical pedon was not sampled.
National Cooperative Soil Survey
U.S.A.