LOCATION MUDDYCREEK OR
Established Series
IRD. RJO/JLW/DAL/KMS
02/2019
MUDDYCREEK SERIES
Landscape--mountains
Landform--lateral moraines on glaciated mountain slopes
Slope--15 to 90 percent
Parent material--thin mantle of volcanic ash over till derived from granite
Mean annual precipitation--about 1000 mm
Mean annual air temperature--about 2 degrees C
Depth class--very deep
Drainage class--somewhat excessively drained
Soil moisture regime--xeric
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Loamy-skeletal, isotic Andic Humicryepts
TYPICAL PEDON: Muddycreek extremely stony ashy loam in an area of woodland; on a 40-percent, south-facing slope at an elevation of 2073 m
Oi--0 to 3 cm; slightly decomposed needles and twigs
A--3 to 18 cm; extremely stony ashy loam, brown (10YR 5/3) dry, very dark grayish brown (10YR 3/2) moist; weak fine and very fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; many fine and few medium and coarse roots; few fine irregular pores; 20 percent gravel, 25 percent cobbles, and 30 percent stones; moderately acid (pH 6.0); clear wavy boundary
AB--18 to 43 cm; extremely stony ashy loam, yellowish brown (10YR 5/4) dry, dark brown (10YR 3/3) moist; weak very fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; many fine and few medium and coarse roots; few fine irregular pores; 20 percent gravel, 25 percent cobbles, and 30 percent stones; slightly acid (pH 6.5); clear wavy boundary
2Bw--43 to 91 cm; extremely stony sandy loam, yellowish brown (10YR 5/4) dry, dark yellowish brown (10YR 4/4) moist; weak fine and medium subangular blocky structure; loose, very friable, nonsticky and nonplastic; common fine and few medium roots; 20 percent gravel, 25 percent cobbles, and 30 percent stones; slightly acid (pH 6.5); gradual smooth boundary
2BC--91 to 155 cm; extremely stony sandy loam, light yellowish brown (10YR 6/4) dry, brown (10YR 5/3) moist; single grain; loose, very friable, nonsticky and nonplastic; few fine roots; 20 percent gravel, 25 percent cobbles, and 30 percent stones; slightly acid (pH 6.5)
TYPE LOCATION: Baker County, Oregon, about 72 m west and 795 m south of the northeast corner of section 24, T. 8 S., R. 36 E.; latitude 44.8530467, longitude -118.2364504, datum WGS 84 (coordinates and PLSS details estimated from point on hard copy map)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--about 2 to 3 degrees C
Mean summer soil temperature--about 5 to 7 degrees C
Mean winter soil temperature--about -2 to 2 degrees C
Soil moisture--dry 30 to 45 consecutive days in summer
Thickness of umbric epipedon--25 to 35 cm
Thickness of ash-influenced layers--25 to 35 cm
Estimated properties of layers influenced by volcanic ash
*Ammonium oxalate extractable Al + 1/2 Fe--1 to 2 percent
*Glass content in 0.02- to 2.0-mm fraction--5 to 20 percent
*1/3-bar bulk density--0.7 to 1.0 g/cm3
*Phosphate retention--50 to 70 percent
*15-bar water retention--5 to 12 percent (dried samples)
*8 x Si plus 2 x Fe--3 to 5 percent
Particle-size control section
*Clay content--3 to 7 percent
*Total rock fragment content--40 to 80 percent
A horizon
Moist color--10YR 3/2, 10YR 3/3
Dry color--10YR 4/2, 10YR 5/3, 10YR 5/4
Fine-earth texture--ashy sandy loam, ashy loamy sand
Clay content--4 to 6 percent
Sand--50 to 80 percent
Organic matter content--2 to 6 percent
Total rock fragment content--35 to 80 percent
Gravel content--10 to 30 percent
Cobble content--5 to 25 percent
Stone content--5 to 30 percent
Reaction--5.6 to 6.5
Thickness--10 to 28 cm
AB horizon
Moist color--10YR 3/2, 10YR 3/3
Dry color--10YR 4/2, 10YR 5/3, 10YR 5/4
Fine-earth texture--ashy sandy loam, ashy loamy sand
Clay content--3 to 5 percent
Sand content--55 to 86 percent
Organic matter content--1.5 to 3.5 percent
Total rock fragment content--35 to 80 percent
Gravel content--10 to 30 percent
Cobble content--5 to 25 percent
Stone content--5 to 30 percent
Reaction--5.6 to 6.5
Thickness--25 to 41 cm
2Bw horizon
Moist color--10YR 4/4, 10YR 5/4
Dry color--10YR 5/4, 10YR 6/4
Fine-earth texture--sandy loam, loamy sand
Clay content--0 to 5 percent
Sand content--60 to 80 percent
Organic matter content--1 to 2 percent
Total rock fragment content--55 to 80 percent
Gravel content--15 to 35 percent
Cobble content--5 to 25 percent
Stone content--10 to 30 percent
Reaction--5.6 to 6.5
Thickness--20 to 70 cm
2BC horizon, and 2C horizon (where present)
Moist color--10YR 4/3, 10YR 4/6, 10YR 5/3
Dry color--10YR 5/3, 10YR 5/4, 10YR 6/3, 10YR 6/4
Fine-earth texture--sandy loam, loamy sand
Clay content--0 to 5 percent
Sand content--65 to 90 percent
Organic matter content--0.5 to 1.5 percent
Total rock fragment content--55 to 80 percent
Gravel content--15 to 35 percent
Cobble content--5 to 25 percent
Stone content--10 to 30 percent
Reaction--5.6 to 6.5
COMPETING SERIES:
Ahklun--50 to 100 cm (moderately deep) to a lithic contact (sedimentary or volcanic rock); medial texture modifier in ash-influenced layers
Goodlow--average of 18 to 27 percent clay in particle-size control section
Nagugun--medial texture modifiers in ash-influenced layers; spodic horizon
GEOGRAPHIC SETTING:
Elevation--1720 to 2200 m
Climate--cold, wet winters; cool, dry summers
Mean annual precipitation--680 to 1430 mm
Mean annual air temperature--about -1 to 4 degrees C
Frost-free period--15 to 60 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Angelbasin--on planar to convex, mid to upper backslopes; 50 to 100 cm (moderately deep) to a lithic contact (granite); thin volcanic ash mantle
Bucketlake--on planer to concave, north-facing, mid to lower backslopes; thick volcanic ash mantle
Elkhorncrest--on convex, mid to upper slopes of moraines and near rock outcroppings; 25 to 50 cm (shallow) to a lithic contact (granite)
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Saturation during normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high
USE AND VEGETATION:
Use--watershed, wildlife habitat, livestock grazing, recreation
Potential native vegetation--subalpine fir, Engelmann spruce, lodgepole pine, skunkleaf polemonium, heartleaf arnica, prince's pine, white hawkweed, Utah honeysuckle, lupine, sidebells wintergreen, sweetcicely, sickletop lousewort, western meadow-rue, big huckleberry, grouse huckleberry, Sitka valerian, darkwoods violet
DISTRIBUTION AND EXTENT: Blue Mountains of northeastern Oregon; MLRA 43C; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Wallowa-Whitman National Forest, Oregon; 2018
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Umbric epipedon--zone from 3 to 43 cm
*Cambic horizon--zone from 43 to 91 cm
*Volcanic ash--zone from 3 to 43 cm
*Andic soil properties--zone from 3 to 43 cm
*Particle-size control section--zone from 3 to 103 cm
National Cooperative Soil Survey
U.S.A.