LOCATION BULLROAR                OR

Established Series
Rev. JW/RJO/DAL
10/2012

BULLROAR SERIES

The Bullroar series consists of very deep, well-drained soils on terraces of mountain valley floors. Bullroar soils formed in volcanic ash over mixed alluvium. Slopes are 0 to 15 percent. The mean annual precipitation is about 27 inches and the mean annual temperature is about 43 degrees F.

TAXONOMIC CLASS: Ashy over loamy-skeletal, amorphic over isotic, frigid Typic Udivitrands

TYPICAL PEDON: Bullroar ashy silt loam - woodland, on a 0 percent slope at an elevation of 4,240 feet. (Colors are for moist soil unless otherwise noted. Soil textures are apparent field textures.)

Oi--0 to 1 inches; needles, twigs, leaves

Oe--1 to 3 inches; moderately decomposed needles, leaves and twigs

A--3 to 6 inches; dark brown (10YR 3/3) ashy silt loam, pale brown (10YR 6/3) dry; weak fine subangular blocky structure; soft, very friable, nonsticky, nonplastic and weakly smeary; common very fine, fine, medium and coarse roots; few very fine tubular pores; slightly acid (pH 6.5); clear wavy boundary. (3 to 15 inches thick)

Bw--6 to 20 inches; brown (10YR 4/3) ashy silt loam, very pale brown (10YR 7/4) dry; weak medium and fine subangular blocky structure; soft, very friable, nonsticky, nonplastic and weakly smeary; common very fine, and fine, and many medium and coarse roots; few very fine tubular pores; slightly acid (pH 6.5); abrupt wavy boundary. (9 to 28 inches thick)

2EBb--20 to 25 inches; dark brown (10YR 3/3) cobbly sandy loam, yellowish brown (10YR 5/4) dry; moderate fine granular structure; slightly hard, friable, slightly sticky and nonplastic; common very fine, fine and medium, and few coarse roots; common very fine irregular pores; 20 percent gravel, and 15 percent cobbles; neutral (pH 6.6); gradual smooth boundary. (3 to 15 inches thick)

2Bwb--25 to 42 inches; dark brown (10YR 3/3) very cobbly sandy loam, brown (10YR 5/3) dry; weak very fine subangular blocky structure; slightly hard, friable, slightly sticky and nonplastic; common very fine, few fine and common medium roots; common very fine irregular pores; 25 percent gravel, 20 percent cobbles, and 10 percent stones; neutral (pH 6.6); gradual smooth boundary. (8 to 17 inches thick)

2BCb--42 to 61 inches; dark yellowish brown (10YR 3/4) extremely stony sandy loam, yellowish brown (10YR 5/4) dry; single grain; loose, very friable, slightly sticky and nonplastic; few very fine, fine and medium roots; common very fine irregular pores; 35 percent gravel, 25 percent cobbles, and 15 percent stones; neutral (pH 6.7); gradual smooth boundary. (10 to 25 inches thick)

2C--61 to 73 inches; dark yellowish brown (10YR 3/4) extremely stony loamy sand, yellowish brown (10YR 5/4) dry; single grain; loose, very friable, nonsticky and nonplastic; common very fine irregular pores; 30 percent gravel, 25 percent cobbles, and 25 percent stones; neutral (pH 6.7)

TYPE LOCATION: Grant County, Oregon
Section 33 (NW , NW , NW ), T. 8 S., R. 32 E.
Latitude: 44 degrees, 50 minutes, 07 seconds N
Longitude: 118 degrees, 52 minutes, 44 seconds W
UTM Zone 11; 4,966,390 northing; 351,480 easting
USGS Quadrangle: Wildcat Point

RANGE IN CHARACTERISTICS:
Soil Temperature: frigid regime
Mean Annual Soil Temperature: 43 to 47 degrees F
Mean Summer Soil Temperature: 51 to 58 degrees F
Mean Winter Soil Temperature: 34 to 38 degrees F
Soil Moisture: udic regime, dry 25 to 45 days in summer

Particle-size Control Section: mineral surface to 40 inches below the mineral surface
Upper part (ashy): 15 to 36 inches thick
Clay content: 2 to 10 percent
Rock fragment content: 0 to 5 percent
Lower part (loamy-skeletal): 4 to 25 inches thick
Clay content: 8 to 17 percent
Rock fragment content: 40 to 60 percent
Rock fragment shape: rounded
Depth to 2C horizon (sandy-skeletal): 60 to 80 inches

Diagnostic Horizons and Features:
andic soil properties: upper boundary at the material surface; 17 to 36 inches thick
Al+1/2Fe(aox): 1.0 to 3.0 percent
bulk density: 0.65 to 1.0 g/cc
P retention: 40 to 90 percent
0.02-2.0 mm fraction: 40 to 60 percent of fine earth
glass content in the 0.02 to 2.0mm fraction: 60 to 90 percent
water content at 1500 kPa (air dried): 5 to 12 percent
8Si + 2Fe (aox): 5 to 12 percent
8Si - 2Fe (aox): 4 to 8 percent
ochric epipedon: 3 to 15 inches thick
cambic horizon:
upper: 9 to 28 inches thick
lower: 8 to 17 inches thick
sandy-skeletal material (water-sorted sand and gravel), depth: 60 to 80 inches

Major Horizons:
A horizon
color, moist: 7.5YR 2/2, 3/2; 10YR 2/2, 3/2, 3/3, 4/2
color, dry: 10YR 3/4, 4/2, 5/2, 6/2, 6/3
texture: ASHY-SIL
clay content: 2 to 10 percent
rock fragment content: 0 to 5 percent
gravel: 0 to 5 percent
reaction: slightly acid to neutral; pH: 6.1 to 7.3
organic carbon: 1 to 5 percent

Bw horizon
color, moist: 7.5YR 3/2; 10YR 3/3, 3/4, 4/3, 5/3
color, dry: 10YR 5/4, 6/2, 6/3, 6/4, 7/2, 7/4, 8/2
texture: ASHY-SIL
clay content: 2 to 10 percent
rock fragment content: 0 to 5 percent
gravel: 0 to 5 percent
reaction: slightly acid to neutral; pH: 6.1 to 7.3
organic carbon: 0.6 to 1.0 percent

2EBb horizon (some pedons have 2ACb or 2Eb horizons)
color, moist: 10YR 3/2, 3/3, 4/3, 5/6; 2.5Y 4/2
color, dry: 10YR 5/3, 5/4, 6/3, 7/4; 2.5Y 7/4
texture: GRV-SL, STV-SL, CBV-SL, GRV-L
clay content: 3 to 18 percent
rock fragment content: 35 to 55 percent
gravel 15 to 55 percent
cobbles 0 to 30 percent
stones 0 to 5 percent
reaction: slightly acid to neutral; pH: 6.1 to 7.3

2Bwb horizon
color, moist: 10YR 3/3, 3/4; 2.5Y 4/2, 4/3
color, dry: 10YR 5/3, 5/4; 2.5Y 6/2, 6/3, 7/4
texture: GRV-SL, CBV-SL, CBX-SL
clay content: 4 to 16 percent
rock fragment content: 50 to 65 percent
gravel 25 to 50 percent
cobbles 0 to 20 percent
stones 0 to 10 percent
reaction: slightly acid to neutral; pH: 6.1 to 7.3
organic carbon: 0 to 1.2 percent

2BCb horizon (some pedons have a 2C horizon)
color, moist: 10YR 3/4; 2.5Y 4/3
color, dry: 10YR 5/4; 2.5Y 6/2, 6/3, 7/4
texture: STX-LS, STX-SL, CBX-LS, GRX-L, STX-S
clay content: 2 to 18 percent
rock fragment content: 60 to 90 percent
gravel 30 to 55 percent
cobbles 5 to 30 percent
stones 0 to 40 percent
reaction: slightly acid to neutral; pH: 6.1 to 7.3
organic carbon: 0 to 1.2 percent

COMPETING SERIES:
Boulderjud -- deep (40 to 60 inches) to a paralithic contact of weathered granite; ashy part of the pscs has 30 to 65 percent glass in the 0.02 to 2.0 mm fraction; has 2Bt horizons below the ash mantle; formed in coarse-silty volcanic ash over colluvium and residuum from granitic rocks
Bulgar -- very deep (>60 inches); ashy part of the pscs has 60 to 90 percent glass in the 0.02 to 2.0 mm fraction; ash mantle with greater than 5 percent rounded rock fragments; has 2EBb, 2Ab, 2AEb, or 2Eb buried surface horizon below the ash mantle; loamy-skeletal throughout the series control section (to 80 inches); glacial rock fragments in lower pscs are rounded; formed in volcanic ash over, mostly granitic, till
Deardorf -- moderately deep (20 to 40 inches) to a lithic contact; ashy part of the pscs has 60 to 90 percent glass in the 0.02 to 2.0 mm fraction; loamy-skeletal part of pscs has 12 to 17 percent clay; formed in volcanic ash over colluvium and residuum from andesitic basalt
Ferguson -- very deep (>60 inches); texture of ash is very fine sandy loam; ashy part of the pscs has 30 to 55 percent glass in the 0.02 to 2.0 mm fraction; has 2Bw horizon; depth to 2C horizon with loamy coarse sand or sand (sandy-skeletal) is 40 to 60 inches; formed in volcanic ash over, mostly granitic, glaciofluvial deposits
Gutridge -- deep (40 to 60 inches) to a lithic contact; ashy part of the pscs has 60 to 90 percent glass in the 0.02 to 2.0 mm fraction; rock fragments in the loamy-skeletal part are subangular; formed in volcanic ash over colluvium from metasedimentary rock
Stalter -- moderately deep (20 to 40 inches) to a paralithic contact of weathered granite; ashy part of the pscs has 60 to 90 percent glass in the 0.02 to 2.0 mm fraction; formed in volcanic ash over colluvium and residuum from granite
Threecent -- moderately deep (20 to 40 inches) to a lithic contact; ashy part of the pscs has 60 to 90 percent glass in the 0.02 to 2.0 mm fraction; loamy-skeletal part of pscs has 4 to 12 percent clay; formed in volcanic ash over colluvium and residuum from metasedimentary rock
Twobit -- moderately deep (20 to 40 inches) to a lithic contact; ashy part of the pscs has 60 to 90 percent glass in the 0.02 to 2.0 mm fraction; loamy-skeletal part of pscs has 18 to 27 percent clay; formed in volcanic ash over colluvium and residuum from metavolcanic rock

GEOGRAPHIC SETTING:
Landform: on terraces and fans on mountain valley floors
Slope gradient: 0 to 15 percent
Parent material origin: volcaniclastic volcanic ash over alluvium
Lithology: Mazama ash over mixed rocks
Elevation: 3,200 to 4,800 feet
Climate: cold, wet winters and warm, moist summers
Mean annual precipitation: 23 to 30 inches
Mean annual air temperature: 41 to 45 degrees F
Frost-free period: 40 to 125 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Bigbouldercreek: occur on terraces and flood plains of valley floors; ash continues throughout pscs and has <35 percent rock fragments
Dardry: occur on terraces of mountain valley floors; has mollic epipedon; does not have ash
Melloe: occur on terraces and flood plains of mountain valley floors; has mollic epipedon; does not have ash
Rebarrow: occur on high terraces of mountain valleys; has argillic horizon;
Sandur: occur on flood plains of mountain valley floors; does not have ash; has loamy sand and sandy textures
Terlough: occur on terraces and flood plains of mountain valley floors; has mollic epipedon; does not have ash

DRAINAGE AND PERMEABILITY:
Drainage: well drained
Permeability: moderately rapid over moderate

USE AND VEGETATION:
Use: timber production, watershed, wildlife habitat, recreation, and livestock grazing
Native vegetation: grand fir, Douglas fir, Englemann spruce, longtube twin flower, Rocky mountain maple, big huckleberry, grouse huckleberry, birchleaf spirea, common snowberry, side-flowered miterwort, sidebells pyrola, heartleaf arnica, bracken fern, common horsetail, pinegrass, elk sedge, Columbia brome and western fescue.
Ecological site: Dominant: ABGR/LIBOL2; other may include: ABGR/ACGL

DISTRIBUTION AND EXTENT:
MLRA 10, Central Rocky and Blue Mountains foothillsDistributing
Extent: small

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

SERIES ESTABLISHED: Wallowa-Whitman National Forests, 2012.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
ochric epipedon: 3 to 6 inches (A horizon)
cambic horizon: 6 to 20 inches (Bw horizon)
particle-size control section:
ashy part: 3 to 20 inches (A and Bw horizons)
loamy-skeletal part: 20 to 43 inches (2EBb, 2Bwb, and 2BC horizons)

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National Cooperative Soil Survey
U.S.A.