LOCATION WEBBERCREEK ID
Established Series
IRD RGK/CBR/EED
05/2018
WEBBERCREEK SERIES
Landscape--mountains
Landform-- mountain slopes, landslides
Slope--1 to 50 percent
Parent material--loess-influenced colluvium over residuum derived from calcareous mudstone, sandstone, and siltstone
Mean annual precipitation--about 460 mm
Mean annual air temperature--about 3 degrees C
Depth class-- moderately deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--cryic
TAXONOMIC CLASS: Fine-loamy, mixed, superactive Xeric Calcicryepts
TYPICAL PEDON: Webbercreek silt loam on a 22-percent slope in an area of rangeland at an elevation of 2170 m
A--0 to 5 cm; silt loam, grayish brown (2.5Y 5/2) dry, dark grayish brown (10YR 4/2) moist; weak medium and thick platy structure parting to weak coarse granular; slightly hard, friable, slightly sticky and moderately plastic; many very fine, fine, medium, and coarse roots; common very fine tubular pores; 5 percent gravel; slightly effervescent; moderately alkaline (pH 8.0); clear wavy boundary
Bk1--5 to 18 cm; silt loam, light brownish gray (2.5Y 6/2) dry, grayish brown (2.5Y 5/2) moist; moderate medium prismatic structure; hard, firm, moderately sticky and moderately plastic; common very fine, fine, medium, and coarse roots; many very fine tubular pores; 5 percent gravel; common fine segregated calcium carbonate filaments; strongly effervescent; moderately alkaline (pH 8.0); clear wavy boundary
Bk2--18 to 36 cm; very fine sandy loam, light gray (2.5Y 7/2) dry, grayish brown (2.5Y 5/2) moist; moderate medium platy structure parting to strong very thin and thin platy; slightly hard, friable, slightly sticky and slightly plastic; common very fine, fine, medium, and coarse roots; common very fine tubular pores; 5 percent gravel; common fine segregated calcium carbonate filaments; violently effervescent; moderately alkaline (pH 8.2); gradual wavy boundary
Bk3--36 to 48 cm; gravelly very fine sandy loam, light brownish gray (2.5Y 6/2) dry, grayish brown (2.5Y 5/2) moist; moderate medium platy structure parting to strong very thin and thin platy; slightly hard, friable, slightly sticky and slightly plastic; common very fine, fine, and medium roots; common very fine tubular pores; 25 percent gravel; common fine segregated calcium carbonate filaments; violently effervescent; moderately alkaline (pH 8.2); gradual wavy boundary
Bk4--48 to 81 cm; gravelly silt loam, light brownish gray (2.5Y 6/2) dry, dark grayish brown (2.5Y 4/2) moist; moderate medium platy structure parting to moderate very thin and thin platy; hard, firm, slightly sticky and slightly plastic; common very fine, fine, and medium roots; common very fine tubular pores; 25 percent gravel; common fine segregated calcium carbonate filaments; violently effervescent; moderately alkaline (pH 8.2); gradual wavy boundary
2Cr--81 to 150 cm; stratified calcareous siltstone, 60 percent gray (5Y 6/1) dry and dark gray (5Y 4/1) moist, 40 percent light gray (2.5Y 7/2) dry and dark grayish brown (2.5Y 4/2) moist
TYPE LOCATION: Clark County, Idaho; latitude 44.44369 degrees north, longitude 112.59575 degrees west, datum WGS 84 (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--3 to 5 degrees C
Depth to bedrock--50 to 100 cm
Depth to calcic horizon--5 to 15 cm
Particle-size control section
Clay content--18 to 27 percent
Total rock fragment content--5 to 25 percent
A horizon
Hue--10YR or 2.5Y dry or moist
Value--4 or 5 dry, 3 or 4 moist
Chroma--2 or 3 dry or moist
Texture--silt loam
Calcium carbonate equivalent--5 to 15 percent
Reaction--7.6 to 8.2 (slightly alkaline and moderately alkaline)
Thickness--5 to 10 cm
Bk horizon
Hue--10YR or 2.5Y dry or moist
Value--5 to 7 dry, 4 or 5 moist
Chroma--2 or 3 dry or moist
Texture--loam, silt loam, very fine sandy loam
Calcium carbonate equivalent--5 to 20 percent
Reaction--7.6 to 8.4 (slightly alkaline and moderately alkaline)
Thickness--46 to 84 cm
Cr horizon
Thickness--18 to 84 cm
COMPETING SERIES: None
GEOGRAPHIC SETTING:
Elevation--1850 to 2400 m
Climate--warm summers, cold winters
Mean annual precipitation--400 to 600 mm
Mean annual air temperature--2 to 3 degrees C
Frost-free period--30 to 60 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--high
USE AND VEGETATION:
Major use--rangeland
Potential natural vegetation--mountain big sagebrush, Idaho fescue, bluebunch wheatgrass
DISTRIBUTION AND EXTENT: Eastern Idaho Plateaus in MLRA 13 and Central Rocky Mountains in MLRA 43B, Idaho; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Clark County, Idaho; 2018
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Ochric epipedon
*Calcic horizon--zone from 5 to 81 cm
*Depth to paralithic contact--81 cm
*Particle-size control section--zone from 25 to 81 cm
ADDITIONAL DATA: As determined from field and laboratory observations, the Cr horizon has a hardness of less than 4 on the Mohs scale. The material of the Cr horizon will slake in water when soaked overnight.
National Cooperative Soil Survey
U.S.A.