LOCATION SCOUT                   UT+CO WY

Established Series
REV: VLM/TWH/SJJ
05/2020

SCOUT SERIES

The Scout series consists of very deep, somewhat excessively drained soils that formed in till, colluvium, slope alluvium, and residuum from sandstone, conglomerate, basalt, quartzite, rhyolite, andesite, and tuff. Scout soils are on mountain slopes, mesa summits, broad ridge tops, and spur ridges and have slopes of 0 to 70 percent. Permeability is moderately rapid. The mean annual precipitation is about 34 inches and the mean annual temperature is about 38 F.

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Ustic Haplocryepts

TYPICAL PEDON: Scout gravelly loam--conifer forest. (Colors are for dry soil unless otherwise stated.)

0i--0 to 2 inches; coarse needles and conifer branches over dark soft humus layers. (1 to 3 inches thick)

A--2 to 6 inches; pale brown (10YR 6/3) gravelly loam, dark brown (10YR 3/3) moist; weak fine granular structure; loose, very friable, nonsticky and slightly plastic; many fine, medium, and large roots; common fine and very fine pores; 15 percent gravel and 5 percent cobbles; slightly acid (pH 6.3); abrupt wavy boundary. (0 to 7 inches thick)

E1--6 to 13 inches; light brown (7.5YR 6/3) gravelly loam, dark yellowish brown (10YR 3/4) moist; weak coarse subangular blocky structure parting to fine granular; slightly hard, friable, nonsticky and slightly plastic; many fine medium, and large roots; many very fine discontinuous and interstitial pores; 15 percent gravel and 5 percent cobbles; slightly acid (pH 6.4); clear wavy boundary. (7 to 11 inches thick)

E2--13 to 20 inches; pink (7.5YR 7/4) gravelly fine sandy loam, brown (7.5YR 4/4) moist; weak coarse subangular blocky structure parting to fine granular; slightly hard, friable, nonsticky and nonplastic; common fine and medium and few large roots; many very fine discontinuous interstitial pores; 15 percent gravel and 5 percent cobbles; moderately acid (pH 6.0); abrupt wavy boundary. (6 to 12 inches thick)

Bw1--20 to 34 inches; light reddish brown (5YR 6/4) very gravelly fine sandy loam, reddish brown (5YR 4/4) moist; massive; loose; common fine medium and few large roots; many very fine discontinuous interstitial pores; 30 percent gravel and 10 percent cobbles; moderately acid (pH 6.0); abrupt wavy boundary. (2 to 12 inches thick)

Bw2--34 to 62 inches; reddish yellow (5YR 6/6) very gravelly sandy loam, yellowish red (5YR 5/8) moist; single grain; loose; few fine, medium and large roots; many fine interstitial pores; 35 percent gravel and 15 percent cobbles; strongly acid (pH 5.5).

TYPE LOCATION: Cache County, Utah; about 1.6 miles east of Baxter sawmill; at the W 1/4 corner of sec. 36, T. 11 N., R. 4 E.

RANGE IN CHARACTERISTICS:
Soil moisture regime - udic, bordering ustic. Dry in some part of the 8 to 24 inch depth for 60 to 90 days during the late summer and early autumn.
Mean annual soil temperature - 33 to 44 degrees F.
Mean summer soil temperature - 48 to 53 degrees F.

Particle-size control section (weighted averages):
Clay content: 8 to 18 percent
Rock fragment content: 35 to 60 percent

A horizon:
Hue: 7.5YR or 10YR
Value: 5 or 6 dry, 3 or 4 moist
Chroma: 2 or 3, dry or moist
Rock fragment content: 15 to 50 percent, consisting of well graded angular quartzite and sandstone, rhyolite, andesite, or tuff
Base saturation: 58 to 72 percent.
Reaction: strongly acid to slightly acid

E horizons (not an albic horizon):
Hue: 7.5YR or 10YR
Value: 5 to 7 dry, 3 to 6 moist
Chroma: 2 to 4, dry or moist
Texture: ranges from gravelly loam to flaggy silt loam
Rock fragment content: 15 to 50 percent, consisting of well graded angular quartzite and sandstone, rhyolite, andesite, or tuff
Base saturation: 58 to 72 percent.
Reaction: strongly acid to slightly acid

Bw horizons:
Hue: 5YR to 10YR
Value: 5 to 7 dry, 4 to 6 moist
Chroma: 3 to 8, dry or moist
Texture: GRV-FSL, FLV-SL, GRV-VFSL, CB-SL, CBV-SL, CBV-SL
Rock fragment content: 35 to 60 percent, consisting of well graded angular quartzite and sandstone, rhyolite, andesite, or tuff
Base saturation: 58 to 72 percent.
Acid oxalate extractable Al plus 1/2Fe: 0.1 to 0.5 percent
Reaction: strongly acid to slightly acid

COMPETING SERIES:
Alpinepeak soils: have a xeric moisture regime and are saturated in some layers.
Blackleed soils: have lamella in the cambic horizon.
Ellena soils: have a lithic contact.
Elve soils: have greater than 60 percent rock fragments in the Bw horizons and have ustic moisture regimes.
Evaro soils: have volcanic ash in the surface layer.
Firada soils: have a lithic contact.
Garlet soils: have horizons of carbonate accumulation.
Gromes soils: average greater than 20 percent clay in the particle-size control section.
Hiore soils: have an ustic moisture regime and contain coarse-grained igneous rocks.
Ketchum soils: have a xeric moisture regime.
Longhike soils: have a paralithic contact.
Losee soils: are calcareous in the lower part of the control section.
Muiral soils: have a lithic contact.
Nambe soils: have base saturation less than 60 percent throughout.
Pergrin soils: have a paralithic contact.
Poso soils: have xeric moisture regimes and accumulations of carbonates.
Rosespring soils: have a xeric moisture regime and accumulations of carbonates.
Rubick soils: have an ustic moisture regime and have rock fragments of coarse-grained igneous lithology.
Shadow soils: have an ustic moisture regime, greater than 15 percent mica in the particle-size control section, and greater than 60 percent rock fragments in the Bw horizon.
Storm soils: average greater than 20 percent clay in the particle-size control section.
Taglake soils: have combination B/E horizons, and rock fragments of granite and gneiss lithology.
Targhee soils: have a lithic contact.
Telay soils: have less than 15 percent coarse fragments in the A horizon (loess cap).
Underdown soils: have a paralithic contact.
Yankeefork soils: have a xeric moisture regime and have sandy textures in the lower part of the control section.

GEOGRAPHIC SETTING: Scout soils are on very steep mountain slopes, mesa summits, broad ridge tops, and spur ridges at elevations of 6,500 to 12,200 feet. Slopes are 0 to 70 percent, commonly with north and east aspect. These soils formed in till, colluvium, and residuum from sandstone, conglomerate, basalt, quartzite, rhyolite, andesite, and tuff. The climate is humid. The average annual precipitation is about 24 to 45 inches and comes mostly as snow during the winter months. The mean annual temperature is 34 to 40 F., the mean summer temperature is 48 to 55 F., and freeze-free period is 30 to 90 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Curtis Creek, Hoskin, Lucky Star, and Spearhead soils. Curtis Creek, Hoskin, and Lucky Star soils have mollic epipedons and argillic horizons. Spearhead soils have thick mollic epipedons.

DRAINAGE AND PERMEABILITY: Somewhat excessively drained; slow and medium runoff; moderately rapid to very rapid permeability.

USE AND VEGETATION: Used for watershed and timber production. The native vegetation is Douglas-fir, subalpine fir, Engelmann spruce, widely spaced aspen, blue wildrye, mountain brome, and bearded wheatgrass.

DISTRIBUTION AND EXTENT: High mountain areas of central and northern Utah and western Colorado. MLRA 47, 48A. This series is of moderate extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana

SERIES ESTABLISHED: Cache County, Utah, 1972.

REMARKS: CEC activity class is based on lab data from several reference samples.
Keys to Soil Taxonomy - classified according to the Seventh Edition, 1996.

Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - from 2 to 6 inches (A horizon)
Cambic horizon - from 6 to 62 inches (E1, E2, Bw1, and Bw2 horizons)
Particle-size control section - the zone from 12 to 42 inches (part of the E1, the E2, Bw1, and part of the Bw2 horizon)

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National Cooperative Soil Survey
U.S.A.