LOCATION BULLREY ID+MT

Established Series
Rev. CWC/KTS-RJS
03/2011

BULLREY SERIES

The Bullrey series consists of very deep, well drained soils that formed in mixed alluvium or colluvium from rhyolitic or similar rock sources. Bullrey soils are on alluvial fans and colluvial slopes. Slopes are 0 to 60 percent. The annual precipitation is about 18 inches and the mean annual air temperature is about 40 degrees F.

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Pachic Haplocryolls

TYPICAL PEDON: Bullrey very gravelly loam, rangeland. (Colors are for dry soil unless otherwise noted.)

A1--0 to 4 inches; dark grayish brown (10YR 4/2) angular very gravelly loam, very dark brown (10YR 2/2) moist; weak very thin platy and weak fine granular structure; soft, very friable, slightly sticky and slightly plastic; many fine roots; many very fine interstitial pores; 40 to 50 percent of surface covered by channery fragments and angular gravel; strongly acid (pH 5.5); clear wavy boundary. (2 to 6 inches thick)

A2--4 to 9 inches; dark grayish brown (10YR 4/2) angular very gravelly loam, very dark brown (10YR 2/2) moist; weak medium and fine subangular blocky structure that parts to moderate very fine and fine granules; soft, very friable, slightly sticky and slightly plastic; common very fine, fine and few medium roots; many very fine tubular pores; 45 percent coarse gravel; moderately acid (pH 5.7); clear wavy boundary. (4 to 20 inches thick)

Bw1--9 to 14 inches; dark grayish brown (10YR 4/2) very gravelly loam, very dark brown (10YR 2/2) moist (rubbed); weak medium and fine subangular blocky structure that parts to moderate fine and very fine granules; slightly hard, friable, slightly sticky and slightly plastic; common fine and few medium roots; many very fine tubular pores; common thin clay films in pores and root channels; 50 percent coarse gravel, moderately acid (pH 5.7); clear wavy boundary. (0 to 8 inches thick)

Bw2--14 to 22 inches; grayish brown (10YR 5/2) very gravelly loam, dark brown (10YR 3/3) moist; weak medium subangular blocky structure that parts to weak fine and very fine granules; slightly hard, friable, slightly sticky and slightly plastic; common fine roots; few fine pores; 55 percent coarse gravel; moderately acid (pH 5.7); clear wavy boundary. (0 to 10 inches thick)

C1--22 to 26 inches; light gray (10YR 7/2) very gravelly loam, brown (10YR 5/3) moist; very weak medium and thick platy and weak very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common fine and few medium roots; many very fine tubular pores; common speckling of uncoated (bleached) sand grains; 35 percent coarse gravel; moderately acid (pH 5.7); clear irregular boundary. (4 to 10 inches thick)

C2--26 to 48 inches; light gray (10YR 7/2) gravelly sandy loam, brown (10YR 5/3) moist; common fine distinct light yellowish brown (10YR 6/4) streaks and mottles, yellowish brown (10YR 5/4) moist; weak thick platy structure; hard, firm, (brittle); few fine, medium, and coarse roots; many very fine tubular pores; 3 percent flagstones, 20 percent gravel; strongly acid (pH 5.5); clear irregular boundary. (0 to 26 inches thick)

C3--48 to 60 inches; light gray (10YR 7/2) extremely gravelly sandy loam, brown (10YR 5/3) moist; massive; hard, firm; few fine roots; few very fine pores; about 10 percent flagstones, about 60 to 70 percent gravel; strongly acid (pH 5.5).

TYPE LOCATION: Owyhee County, Idaho; Northwest Hydrology Research Watershed, Reynolds Creek Area; about 9.5 miles south of Reynolds School, and about 450 feet west of the crest of the ridge; near center of section 24, T.4S., R.4W. Northwesterly 5 percent slope at 6,375 feet elevation.

RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 35 to 44 degrees F.
Mean summer soil temperature - 56 to 59 degrees F.
Thickness of the mollic epipedon - 20 to 30 inches thick
Depth to a lithic contact - more than 40 inches, and commonly is more than 60 inches

Particle-size control section
Textures - dominantly very gravelly loam or very gravelly sandy clay loam
Clay content - averages 18 to 27 percent clay
Rock fragments - average 35 to 60 percent
Rock fragment shape - flat fragments of rhyolite and angular gravel
Reaction class - moderately acid to neutral

A horizons
Hue: 10YR or 7.5YR; dry or moist
Value: 4 or 5 dry; 2 or 3 moist
Chroma: 2 or 3; dry or moist
Textures: gravelly loam, very gravelly loam, very flaggy loam, stony loam, very stony loam or extremely stony loam
Organic matter: in the upper 5 to 8 inches - 5 to 9 percent

Bw horizons
Hue: 10YR or 7.5YR; dry or moist
Value: 4 or 5 dry; 2 to 4 moist
Chroma: 2 to 4; dry or moist
Clay content: less than 1.2 times that in the A1 horizon
Structure: commonly weak subangular blocky which parts to granules
Note: few thin clay films are common on ped and rock fragment surfaces

C horizons
Hue: 10YR or 7.5YR; dry or moist
Value: 5 to 7 dry; 4 to 6 moist
Chroma: 2 to 4; dry or moist

COMPETING SERIES:
Baconcamp (OR) - moderately deep to a lithic contact
Badgerton (ID) - have a xeric moisture regime
Badhap (NV) - have a xeric moisture regime
Behanco (CO) - is deep to a lithic contact
Behanin (UT) - have average summer soil temperature of 48 to 54 degrees F.
Belsac (NV) - is moderately deep to a paralithic contact
Boatman (MT) - have an udic moisture regime
Boydhollow (ID) - have secondary calcium carbonate accumulation
Busterback (ID) - have a xeric moisture regime
Croesus (NV) - is moderately deep to a lithic contact
Dressel (CO) - have an udic moisture regime
Gateview (CO)- have less than 18 percent clay in the particle-size control section
Goodski (NV) - is moderately deep to a lithic contact
Hapgood (NV) - is deep to a lithic contact
Harcany (NV) - have less than 18 percent clay in the particle-size control section
Hobacker (WY) - have secondary calcium carbonate accumulation
Lionhead (ID) - have secondary calcium carbonate accumulation
Lolon (MT) - have a lithologic discontinuity
Marcetta (MT) - have an albic horizon
Mundos (WY) - have secondary calcium carbonate accumulation
Nagitsy (ID) - is moderately deep to a lithic contact
Namela (CO) - is moderately deep to a lithic contact
Nazaton (ID) - have an O horizon
Papaspila (CO) - have an udic moisture regime
Parkcity (UT) - have an udic moisture regime
Poleline (UT) - is deep to a lithic contact
Povey (ID) - have a xeric moisture regime
Snacreek (NV) - have less than 18 percent clay in the particle-size control section
Snopoc (NV) - have less than 18 percent clay in the particle-size control section
Splitbutte (ID) - is moderately deep to a lithic contact
Sweethollow (ID) - have less than 18 percent clay in the particle-size control section
Tonigut (UT)- is deep to a lithic contact

GEOGRAPHIC SETTING:
Landform - alluvial fans and colluvial slopes
Elevation - 5,500 to 8,600 feet
Slope - 0 to 60 percent
Parent material - mixed alluvium or colluvium from rhyolitic or similar rock sources
Climate - cool, subhumid
Mean annual precipitation - 16 to 25 inches
Mean annual air temperature - 34 to 42 degrees F, and the mean summer temperature is about 54 to 59 degrees F.
Frost-free period - 30 to 90 days
Temperature regime - cryic
Moisture regime - ustic

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Babbington and Demast soils, which have argillic horizons.

DRAINAGE AND PERMEABILITY: Well drained; medium or rapid runoff; moderate permeability.

USE AND VEGETATION: Nearly all is used for rangeland. Vegetation is principally big sagebrush, Idaho fescue, bluebunch wheatgrass, Sandberg bluegrass, cheatgrass, and in places some chokecherry, Stipa spp., snowberry, bitter cherry, wild currant, bull thistle, violet, yarrow, iris, snowbrush, balsamroot, serviceberry, or (and) few Douglas-fir or aspen.

DISTRIBUTION AND EXTENT: Southern Idaho. The series is inextensive. MLRAs - 10, 43B and 44B.

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

SERIES ESTABLISHED: Owyhee County, Idaho, 1975.

National Cooperative Soil Survey
U.S.A.