LOCATION GOODALFS                ID

Established Series
Rev. RW/TDT
01/2011

GOODALFS SERIES

The Goodalfs series consists of very deep, moderately well drained soils that formed in loess and silty alluvium high in ash. Permeability is moderate. These soils are in depressions on fan terraces and along mountain valley drainages. Slopes are 0 to 1 percent. The mean annual precipitation is about 16 inches and the mean annual temperature is about 42 degrees F.

TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Vitrandic Haploxerolls

TYPICAL PEDON: Goodalfs medial silt loam, rangeland. (Colors are for dry soil unless otherwise noted.)

A--0 to 3 inches; dark grayish brown (10YR 4/2) medial silt loam, black (10YR 2/1) moist; weak fine granular structure; soft, very friable, slightly sticky and slightly plastic; many fine and medium roots; many very fine interstitial pores; neutral (pH 7.0); clear wavy boundary. (2 to 8 inches thick)

Bw1--3 to 10 inches; brown (10YR 4/3) ashy silt loam, very dark grayish brown (10YR 3/2) moist; moderate fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; many fine and medium roots; common medium, many very fine and fine tubular pores; neutral (pH 7.2); clear smooth boundary. (5 to 12 inches thick)

Bw2--10 to 24 inches; brown (10YR 4/3) ashy silt loam, very dark grayish brown (10YR 3/2) moist; moderate medium subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; common very fine and fine roots; many fine and medium tubular pores; neutral (pH 7.3); clear smooth boundary. (10 to 20 inches thick)

Bw3--24 to 40 inches; brown (10YR 4/3) ashy silty clay loam, very dark grayish brown (10YR 3/2) moist; moderate medium subangular blocky structure; hard, friable, moderately sticky and moderately plastic; common fine roots; many fine and medium tubular pores; slightly alkaline (pH 7.4); clear smooth boundary. (12 to 20 inches thick)

Bw4--40 to 60 inches; dark yellowish brown (10YR 4/4) ashy silt loam, dark brown (10YR 3/3) moist; massive; hard, friable, moderately sticky and moderately plastic; few fine roots; many fine and medium tubular pores; slightly alkaline (pH 7.5).

TYPE LOCATION: Butte County, Idaho; 3/4 mile north of Craters of the Moon Monument Headquarters; 1,300 feet west and 1,900 feet north of the southeast corner, sec. 27, T. 2 N., R. 24 E. Latitude - 113 degrees, 34 minutes, 45 seconds north; Longitude - 43 degrees, 28 minutes, 21 seconds west.

RANGE IN CHARACTERISTICS:

The soil moisture control section is dry for 80 to 100 consecutive days.
Particle-size control section - 18 to 32 percent clay
Mean annual soil temperature - 42 to 47 degrees F
Mollic epipedon is 20 to 30 inches thick.

A horizon
Value - 3 or 4 dry, 2 or 3 moist
Chroma - 1 or 2 dry or moist
Organic matter is 2 to 4 percent.
Glass content is 5 to 30 percent
Phosphate retention is 50 to 80
Acid oxalate aluminum plus one-half the acid oxalate iron is 1.0 to 2.0
15 bar water dry is 12 to 15, moist 20 to 30 percent.

Bw horizon
Value - 3 or 4 dry, 2 or 3 moist
Chroma - 2 or 3 moist and 3 or 4 dry
Texture - SIL, SICL
Reaction - neutral to slightly alkaline
Organic matter is 0.5 to 2 percent and decreases irregularly with depth.
Glass content is 5 to 15 percent
Phosphate retention is 10 to 30
Acid oxalate aluminum plus one-half the acid oxalate iron is 0.4 to 1.3

COMPETING SERIES: These are the Albee, Kahler and Minam soils. All of these soils are well drained. Albee soils are 20 to 40 inches to bedrock. Kahler soils are on mountains and have an 0 horizon. Minam soils have gravelly textures at 30 to 40 inches.

GEOGRAPHIC SETTING: Goodalfs soils are in depressions on fan terraces and along mountain valley drainages. Slopes range from 0 to 1 percent. They formed in loess and silty alluvium. The mean annual precipitation ranges from 14 to 18 inches, and the mean annual temperature ranges from 40 to 45 degrees F. The frost-free season is about 60 to 90 days. Elevation ranges from 5,500 to 6,000 feet.

GEOGRAPHICALLY ASSOCIATED SOILS: This is the Craters soil. Craters soils are on adjacent, slightly higher, terraces and along drainageways.

DRAINAGE AND PERMEABILITY: Moderately well drained; slow runoff; moderate permeability. Ponding occurs for brief periods during spring snowmelt.

USE AND VEGETATION: Used for livestock grazing and recreation. The potential natural vegetation is basin wild rye.

DISTRIBUTION AND EXTENT: Southeastern Idaho. The series is of small extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: Craters of the Moon Area, Idaho 1999.

REMARKS: Diagnostic horizons and features recognized in this series are:

Mollic epipedon - 0 to 24 inches
Cambic horizon - 24 to 60 inches
Vitrandic subgroup
the A horizon has andic soil properties
the Bw horizons qualify as Vitrandic throughout.

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National Cooperative Soil Survey
U.S.A.