LOCATION BROADYCREEK OR
Established Series
IRD. RAW/KMS/DAL
11/2018
BROADYCREEK SERIES
Landscape--mountains
Landform--terraces and flood plains on mountain valleys, drainageways on mountain slopes
Slope--0 to 30 percent
Parent material--alluvium derived from mixed sources
Mean annual precipitation--about 720 mm
Mean annual air temperature--about 4 degrees C
Depth class--very deep
Drainage class--somewhat poorly drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--aquic
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive Aquic Cumulic Haplocryolls
TYPICAL PEDON: Broadycreek silt loam in an area of subalpine fir forest, on 0-percent slope at an elevation of 1485 m
Oi--0 to 3 cm; slightly decomposed plant material consisting of needles and twigs
Oe--3 to 8 cm; moderately decomposed plant material
A1--8 to 20 cm; silt loam, dark grayish brown (10YR 4/2) dry, very dark brown (10YR 2/2) moist; weak fine and very fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine and common fine roots throughout; common very fine and fine irregular pores; slightly acid (pH 6.1); clear wavy boundary
A2--20 to 38 cm; silt loam, grayish brown (10YR 5/2) dry, very dark grayish brown (10YR 3/2) moist; weak very fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common very fine and fine and few medium and coarse roots throughout; few very fine irregular pores; slightly acid (pH 6.3); gradual smooth boundary
A3--38 to 79 cm; sandy loam, grayish brown (10YR 5/2) dry, very dark grayish brown (10YR 3/2) moist; weak fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common very fine and fine and few medium roots throughout; few very fine irregular pores; neutral (pH 6.7); gradual smooth boundary
C--79 to 107 cm; stony sandy loam, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; slightly hard, very friable, nonsticky and nonplastic; few very fine, fine, and medium roots throughout; few very fine irregular pores; 15 percent gravel, 5 percent cobbles, and 5 percent stones; neutral (pH 6.9); gradual smooth boundary
Cg--107 to 184 cm; extremely cobbly loamy sand, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; common medium faint gray (10YR 6/1) redoximorphic depletions and few fine distinct yellowish brown (10YR 5/6) redoximorphic concentrations; single grain; loose, nonsticky and nonplastic; common very fine irregular pores; 35 percent gravel, 20 percent cobbles, and 10 percent stones; neutral (pH 6.9)
TYPE LOCATION: Union County, Oregon; in the NE1/4NW1/4NW1/4 of section 16, T. 6 S. , R. 36 E.; latitude 45.0492850, longitude -118.3136294, datum WGS 84 (coordinates estimated from PLSS details)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--3 to 8 degrees C
Mean summer soil temperature--7 to 12 degrees C
Mean winter soil temperature--0 to 3 degrees C
Soil moisture--dry 25 to 45 days in summer
Thickness of mollic epipedon--40 to 75 cm
Depth to aquic conditions--60 to 100 cm
Particle-size control section
*Clay content--3 to 10 percent
*Total rock fragment content--3 to 15 percent
A horizon
Hue--7.5YR, 10YR
Value--2 to 3 moist, 3 to 5 dry
Chroma--1 to 3 moist, 2 dry
Fine-earth texture--silt loam, loam, sandy loam
Clay content--3 to 12 percent
Sand content--35 to 85 percent
Organic matter content--1 to 5 percent
Total rock fragment content--0 to 30 percent
Gravel content--0 to 30 percent
Reaction--5.6 to 7.3
Combined thickness--41 to 76 cm
C horizon
Hue--7.5YR, 10YR
Value--2 to 3 moist, 4 or 5 dry
Chroma--1 to 3 moist or dry
Fine-earth texture--loam, sandy loam
Clay content--4 to 12 percent
Sand content--50 to 70 percent
Organic matter content--0.5 to 1.0 percent
Total rock fragment content--0 to 30 percent
Gravel content--0 to 30 percent
Cobble content--0 to 5 percent
Stone content--0 to 5 percent
Reaction--6.1 to 7.3
Thickness--23 to 64 cm
Cg horizon
Hue--7.5YR, 10YR
Value--2.5 or 3 moist, 4 or 5 dry
Chroma--1 to 3 moist or dry
Fine-earth texture--loamy sand, sand
Clay content--1 to 14 percent
Sand content--70 to 95 percent
Organic matter content--0 to 1 percent
Total rock fragment content--35 to 78 percent
Gravel content--35 to 45 percent
Cobble content--0 to 20 percent
Stone content--0 to 15 percent
Reaction--6.1 to 7.3
COMPETING SERIES:
Cablab--xeric soil moisture regime
Pappascreek--ustic soil moisture regime
GEOGRAPHIC SETTING:
Elevation--1210 to 1900 m
Climate-- cold, wet winters; cool, moist summers
Mean annual precipitation--480 to 1350 mm
Mean annual air temperature--1 to 6 degrees C
Frost-free period--15 to 100 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Bandarrow--in wet meadows and on flood plains of broad mountain valley floors
Bodale--on high terraces of narrow valley floors on dissected basalt plateaus
Digit (T)--on alluvial terraces and in swales of valleys on mountains and dissected plateaus; thick volcanic ash mantle
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Saturation during normal years--saturated at a depth of 107 to 183 cm in April and May
Flooding--occasional, very brief periods in April and May
Ponding--rare periods in April and May
Saturated hydraulic conductivity (Ksat)--moderately high over high or very high
USE AND VEGETATION:
Use--timber production, watershed, wildlife habitat, recreation, livestock grazing
Potential native vegetation--gray alder, Engelmann spruce, lodgepole pine, grand fir, subalpine fir, Kentucky bluegrass, prickly currant, sticky currant, baldhip rose, miner's lettuce, starry false Solomon's seal, redosier dogwood, cowparsnip, drooping woodreed, sweet-scented bedstraw, blue wildrye, aster, bluejoint, violet, rose angelica, queencup bead lily, arrowleaf ragwort, claspleaf twistedstalk
DISTRIBUTION AND EXTENT: Blue Mountains and Wallowa Mountains of northeastern Oregon; MLRA 10; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Union County, Oregon; 2018
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Mollic epipedon--zone from 3 to 79 cm
*Aquic conditions--zone from 107 to 184 cm
*Particle-size control section--zone from 33 to 108 cm
National Cooperative Soil Survey
U.S.A.