LOCATION BORID                   ID

Established Series
Rev. DJT/ALH/RWL
11/2010

BORID SERIES

The Borid series consists of shallow, somewhat excessively drained soils with moderately rapid permeability that formed in colluvium and residuum from granitic rocks. Slopes range from 25 to 90 percent in mountains and canyons. The average annual precipitation is about 15 inches and the average annual temperature is about 50 degrees F.

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic Aridic Lithic Haploxerolls

TYPICAL PEDON: Borid fine gravelly sandy loam -- on a south-facing slope of 45 percent at 4,760 feet elevation in rangeland. When described on September 26, 1995, the soil was dry throughout. (Colors are for air-dry soil unless otherwise noted.)

A--0 to 3 inches: brown (10YR 5/3) fine gravelly sandy loam, dark brown (10YR 3/3) moist; weak thin platy structure; soft, very friable, slightly sticky and slightly plastic; common very fine and fine, few medium and coarse roots; many very fine and fine irregular pores; 5 percent cobbles and 20 percent fine gravel; neutral (pH 6.7); clear wavy boundary. (2 to 8 inches thick)

AB--3 to 7 inches; brown (10YR 5/3) very gravelly sandy loam, dark brown (10YR 3/3) moist; weak fine subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; common very fine and fine, few medium and coarse roots; many very fine and fine irregular pores; 35 percent gravel; neutral (pH 6.9); gradual wavy boundary. (0 to 5 inches thick)

Bw--7 to 15 inches; pale brown (10YR 6/3) very gravelly sandy loam, brown (10YR 4/3) moist; moderate fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; few very fine and fine roots; common very fine and fine irregular and tubular pores; 50 percent gravel; neutral (pH 7.2); gradual wavy boundary. (5 to 10 inches thick)

R--15 inches; fractured granite porphyry.

TYPE LOCATION: Ada County, Idaho; about 3 miles northeast of Boise; 2,250 feet north and 550 feet east of the southwest corner of section 10, T.3 N., R.3 E.; USGS Lucky Peak Quadrangle; Latitude - 43 degrees, 36 minutes, 34 seconds N. and Longitude - 116 degrees, 05 minutes, 34 seconds W.; NAD 83.

RANGE IN CHARACTERISTICS:
Mollic epipedon thickness - 7 to 12 inches
Depth to bedrock - 10 to 20 inches
Reaction - slightly acid or neutral
Base saturation - 50 to 75 percent in the zone from 0 to 15 inches
Particle-size control section - 10 to 15 percent clay; 35 to 60 percent rock fragments
Moisture control section - moist less than 90 consecutive days when the soil temperature is greater than 47 degrees F.
Average annual soil temperature - 49 to 54 degrees F.

A horizon
Value - 4 or 5 dry
Chroma - 2 or 3 dry or moist
Rock fragments - 0 to 20 percent cobbles, 15 to 30 percent gravel and 15 to 35 percent total

AB horizon
Value - 4 or 5 dry
Chroma - 2 or 3 dry or moist
Texture - SL or COSL
Clay content - 10 to 15 percent
Rock fragments - 0 to 10 percent cobbles, 35 to 50 percent gravel and 35 to 60 percent total

Bw horizon
Value - 4 through 6 dry, 3 or 4 moist
Chroma - 3 or 4 dry or moist
Texture - SL or COSL
Clay content - 10 to 15 percent
Rock fragments - 0 to 10 percent cobbles, 35 to 50 percent gravel and 35 to 60 percent total

COMPETING SERIES: These are the Brisky, Buckrock (T), Cox, Swakane, and Witzel series. Brisky, Buckrock, Skakane, and Witzel soils have a xeric soil moisture regime. Cox soils have a solum formed in sandy eolian material reworked by water that is contrasting to the basalt bedrock and rock fragments that are dominantly (greater than 10 percent) stones and cobbles.

GEOGRAPHIC SETTING: Borid soils are on south-facing hill shoulders and backslopes and canyon walls at elevations of 2,500 to 5,300 feet. These soils formed in colluvium and residuum from granitic rocks. Slopes range from 25 to 90 percent. The average annual precipitation is 12 to 17 inches. The average annual temperature is 47 to 52 degrees F. The frost-free period is 110 to 155 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Arrowrock, Painter and Shimo soils. Arrowrock soils are sandy, have a paralithic contact and are on similar geomorphic positions. Painter and Shimo soils are on hill backslopes and are moderately deep to bedrock.

DRAINAGE AND PERMEABILITY: Somewhat excessively drained; very rapid runoff; moderately rapid permeability.

USE AND VEGETATION: Borid soils are used mainly for rangeland and wildlife habitat. Native vegetation is antelope bitterbrush, basin big sagebrush, bluebunch wheatgrass and Thurber needlegrass.

DISTRIBUTION AND EXTENT: West-central Idaho. MLRA 10. Borid soils are not extensive.

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

SERIES ESTABLISHED: Boise County Area, Idaho, Parts of Ada and Boise Counties, 2005.

REMARKS: Diagnostic horizons and features recognized in this pedon:
Mollic epipedon - zone from the soil surface to 7 inches (A and AB horizons)
Cambic horizon - zone from 7 to 15 inches (Bw horizon)
Ultic subgroup criteria is also meet
Particle-size control section - zone from 10 to 15 inches or from the surface to the lithic contact when less than 14 inches deep
Lithic contact - at 15 inches (R)
Soil moisture regime - aridic bordering on xeric

These soils are drier than other Xerolls in the region under similar precipitation due to very low AWC, early runoff and extended period of high evapotranspiration.

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National Cooperative Soil Survey
U.S.A.