LOCATION CONGLE ID

Established Series
Rev. DA/CLM
01/2019

CONGLE SERIES

The Congle series consists of very deep, well drained soils that formed in colluvium from welded tuff and volcanic ash. They are on backslopes and footslopes. Permeability is moderately slow. Slopes range from 8 to 30 percent. The average annual precipitation is about 410 mm, and the average annual temperature is about 6.7 degrees C.

TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Pachic Ultic Haploxerolls

TYPICAL PEDON: Congle gravelly loam - on a northeast-facing slope of 25 percent under native rangeland vegetation at 1,710 meter elevation. (Colors are for dry soil unless otherwise stated.) When described on October 3, 1977, the soil profile was dry.

A--0 to 10 cm; dark brown (10YR 4/3) gravelly loam, black (10YR 2/1) moist; weak thin platy structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine and fine tubular pores; 15 percent gravel; neutral (pH 6.6); clear smooth boundary. (10 to 25 cm thick)

Bw1--10 to 28 cm; dark brown (10YR 3/3) gravelly loam, very dark brown (10YR 2/2) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine tubular pores; 15 percent gravel; neutral (pH 6.6); clear smooth boundary. (15 to 43 cm thick)

Bw2--28 to 107 cm; dark brown (10YR 3/3) gravelly clay loam, black (10YR 2/1) moist; moderate medium subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common very fine and fine roots; common very fine and fine tubular pores; 15 percent gravel; neutral (pH 6.8); abrupt smooth boundary. (25 to 79 cm thick)

Bw3--107 to 157 cm; light yellowish brown (10YR 6/4) gravelly clay loam, dark brown (10YR 4/3) moist; moderate medium subangular blocky structure; hard, firm, moderately sticky and moderately plastic; few very fine and fine roots; common very fine tubular pores; 25 percent gravel; neutral (pH 7.0).

TYPE LOCATION: Twin Falls County, Idaho; about 12 miles east of Hollister, Idaho; in the southwest quarter of the southwest quarter of the northeast quarter, section 34, T. 12 S., R. 18 E.; USGS Grand View Peak 7.5 minute topographic quadrangle; latitude 42 degrees 20 minutes 26 10seconds N and longitude 114 degrees 20 minutes 03 seconds W; WGS84 Decimal Degrees 42.3405556 latitude, -114.3341667 longitude.

RANGE IN CHARACTERISTICS:

Depth to welded tuff or ash - more than 150 cm.
Rock fragments in control section - 5 to 30 percent
Solum reaction - neutral or slightly acid
Average clay content in control section - 30 to 35 percent
Average annual soil temperature - 6.7 to 8.3 degrees C.
Mollic epipedon - 50 to 107 cm.
Base saturation - 60 to 70 percent in the upper 75 cm.
Typic xeric moisture regime.

A horizon
Value - 3 or 4 dry, 2 or 3 moist
Chroma - 1 through 3 dry or moist
Granular or platy structure

Bw horizon
Value - 3 through 6 dry, 2 or 3 moist
Chroma - 1 through 4 dry or moist
Textures - CL, GR-CL, GR-L, or GR-SICL
Subangular blocky or prismatic structure

COMPETING SERIES: These are the Buford, Childs, Harahill, Kahler, McGarr, and Tournquist series. Buford soils are deep to bedrock and have 18 to 27 percent clay in the particle-size control section. Childs soils are strongly and medium acid, and have an average annual precipitation of 45 to 60 inches. Harahill and McGarr soils are 50 to 100 cm deep to bedrock. Kahler soils have 18 to 30 percent clay in the control section. Tournquist soils have a hue of 5YR or 2.5YR in the B horizon.

GEOGRAPHIC SETTING: Congle soils are on backslopes and footslopes. The slope range is 8 to 30 percent. The soils formed in colluvium from welded tuff and volcanic ash. Elevations are 1,465 to 1,955 meters. The average annual precipitation ranges from 13 to 20 inches. The average annual temperature is 5.6 to 7.2 degrees C. The frost free season is 80 to 100 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Amboat, Brose, Doodlelink, Oshone, Stricker, and Tucker soils. Amboat and Brose soils are on summits. Amboat soils are clayey-skeletal. Brose soils are shallow to welded tuff. Doodlelink soils are on the same landscape but are loamy-skeletal. Oshone soils are on terraces below the Congle soil on the landscape, and are moderately deep to a hardpan. Stricker soils occur on the same landscape but at lower elevations, and are loamy-skeletal. Tucker soils occur on lower terraces, are fine, and somewhat poorly drained.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; medium runoff; moderately slow saturated hydraulic conductivity.

USE AND VEGETATION: Congle soils are used for rangeland. Native vegetation is Idaho fescue, bluebunch wheatgrass, and mountain big sagebrush, and rabbitbrush.

DISTRIBUTION AND EXTENT: Congle soils are of small extent in south central Idaho. MLRA 25.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California

SERIES ESTABLISHED: Twin Falls County, Idaho, 1992.

REMARKS: Base saturation: 0-4"-65%; 4-11"-68%; 11-42"-70%.
Diagnostic horizons and features recognized in this pedon are:

Mollic epipedon - 0 to 107 cm.
Pachic feature - mollic thicker than 50 cm.
Ultic feature - less than 75 percent base saturation in the upper 100 cm.

Particle-size control section - 25 to 100 cm

The superactive cation exchange activity class was added in 03/2003 to the taxonomic classification by the National Soil Survey Center on request of the Reno MLRA office, without review of the soil series property data. The remainder of this document has not been updated.

National Cooperative Soil Survey
U.S.A.