LOCATION WINRIDGE IDEstablished Series
The Winridge series consists of moderately deep, well drained soils
that formed in latite, andesite and welded tuff. Winridge soils are on
mountainsides and have slopes of 15 to 60 percent. Permeability is
very slow. The average annual precipitation is about 18 inches, and
the average annual temperature is about 39 degrees F.
TAXONOMIC CLASS: Fine, smectitic Pachic Argicryolls
TYPICAL PEDON: Winridge clay loam - on a 38 percent slope at an
elevation of 6,250 feet in rangeland. When described on August 8,
1979, the soil was dry throughout. (Colors are for dry soil unless
otherwise noted)
A--0 to 4 inches; dark grayish brown (10YR 4/2) clay loam, very
dark grayish brown (10YR 3/2) moist; strong fine subangular blocky
structure; soft, very friable, sticky and plastic; many very fine
roots; common very fine tubular pores; about 10 percent pebbles;
vertical cracks 1 to 3 cm wide, 10 to 20 cm apart, slightly acid (pH
6.2); abrupt smooth boundary. (3 to 8 inches thick)
Bt1--4 to 10 inches; dark grayish brown (10YR 4/2) gravelly clay,
very dark grayish brown (10YR 3/2) moist; strong fine subangular blocky
structure; very hard, firm, very sticky and plastic; common very fine,
fine, and medium roots; many very fine and fine tubular pores; about 15
percent pebbles and 5 percent cobbles; vertical cracks 1 to 3 cm wide
and 10 to 20 cm apart, many moderately thick clay films on ped faces;
slightly acid (pH 6.4); abrupt smooth boundary. (5 to 16 inches thick)
Bt2--10 to 16 inches; brown (10YR 4/3) clay, dark brown (10YR 3/3)
moist; strong medium and coarse prismatic structure; extremely hard,
very firm, very sticky and very plastic; common very fine, fine, and
medium roots; few very fine tubular pores; about 10 percent pebbles;
vertical cracks 1 to 2 cm wide and 10 to 20 cm apart; continuous
moderately thick clay films on ped faces; slightly acid (pH 6.4); clear
wavy boundary. (3 to 10 inches thick)
Bt3--16 to 23 inches; olive brown (2.5Y 4/4) sandy clay loam, dark
grayish brown (2.5Y 4/2) moist; moderate medium subangular blocky
structure; hard, firm, sticky and plastic; few very fine and fine
roots; many very fine tubular pores; about 5 percent fine pebbles;
common thin clay films on ped faces; slightly acid (pH 6.4); clear
smooth boundary. (0 to 7 inches thick)
R--23 inches decomposing andesite bedrock.
TYPE LOCATION: Blaine County, Idaho, about 8 miles north and 1 mile
west of Carey; 1,500 feet south of the northeast corner of sec. 16, T.
1 N., R. 21 E.
RANGE IN CHARACTERISTICS:
Depth to latite, andesite or welded tuff bedrock - 20 to 40 inches
Average annual soil temperature - 39 to 43 degrees F.
Average summer soil temperature - 54 to 59 degrees F.
Reaction - Slightly acid to neutral throughout
Thickness of the mollic epipedon - 16 to 30 inches
Depth of continuous vertical cracks - 40 to 60 cm
Width of vertical cracks - 1 to 3 cm
Bt3 Horizon - Lacking in some pedons
A Horizon
Color value - 4 or 5 dry, 3 or 4 moist
Chroma, moist or dry - 2 or 3
Clay content - 27 to 35 percent
Rock fragments - 0 to 10 percent
Bt1 and Bt2 Horizons
Color hue - 10YR, 7.5YR
Color value, dry - 4 through 6
Color value, moist - 3 or 4
Chroma, moist or dry - 2 through 4
Texture - C, GR-C, or CB-C
Clay content - 40 to 60 percent
Rock fragments - 5 to 35 percent
Bt3 Horizon
Color hue - 7.5YR, 5YR; 2.5Y
Color value, dry - 4 through 6
Chroma, dry - 4 or 5
Chroma, moist - 2 through 4
Texture - SCL, GR-CL, or CB-CL
Clay content - 27 to 40 percent
Rock fragments - 5 to 25 percent
COMPETING SERIES: These are the Cimarron and Gourley series. Cimarron
and Gourley soils lack bedrock above a depth of 40 inches.
GEOGRAPHIC SETTING: Winridge soils are on mountainsides. Slopes range
from 15 to 60 percent. Elevation ranges from 5,500 to 7,500 feet. The
soil formed in latite, andesite and welded tuff. The average annual
precipitation is 16 to 20 inches, most of which falls as snow and early
spring rain. The average annual temperature is about 37 degrees to 41
degrees F. The frost free season is less than 60 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Friedman, Winu,
Elksel, and Starhope soils. Friedman and Winu soils have a mollic
epipedon greater than 20 inches thick. Elksel and Starhope soils have
an annual summer soil temperature greater than 59 degrees F and are on
south and west-facing slopes. Friedman and Winu soils occur on north
and east-facing slopes.
DRAINAGE AND PERMEABILITY: Well drained. Runoff is medium to very
rapid. Permeability is very slow.
USE AND VEGETATION: Mainly used for rangeland. Vegetation is Low
sagebrush, Hoods phlox, Idaho fescue, and Sandberg bluegrass.
DISTRIBUTION AND EXTENT: South-central Idaho. This series is of
limited extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Blaine County, Idaho, 1985.
REMARKS: Diagnostic features recognized in this soil are:
Mollic epipedon - zone from the soil surface to about 16 inches (A,
Bt1, and Bt2 horizons)
Argillic horizon - zone from about 4 to 23 inches (Bt1, Bt2, and Bt3
horizons)
Particle-size control section - 4 to 23 inches (Bt1, Bt2, and Bt3
horizons)
Lithic contact - at 23 inches (R horizon)
National Cooperative Soil Survey