LOCATION ENDCREEK OR
Established Series
IRD. RJO/DAL/KMS
01/2019
ENDCREEK SERIES
Landscape--mountains
Landform--mountain slopes
Slope--0 to 60 percent
Parent material--thick mantle of volcanic ash over colluvium and residuum derived from granite
Mean annual precipitation--about 690 mm
Mean annual air temperature--about 4 degrees C
Depth class--moderately deep to lithic bedrock
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--frigid
Soil moisture subclass--typic
TAXONOMIC CLASS: Ashy over loamy-skeletal, amorphic over isotic, frigid Typic Vitrixerands
TYPICAL PEDON: Endcreek ashy silt loam in an area of woodland, on a 40-percent, convex, northeast-facing slope at an elevation of 1839 m
Oi--0 to 1 cm; leaves and needles
A--1 to 23 cm; ashy silt loam, light yellowish brown (10YR 6/4) dry, dark yellowish brown (10YR 4/4) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; many fine and few medium roots; few fine tubular pores; 5 percent gravel; slightly acid (pH 6.5); gradual smooth boundary
Bw--23 to 41 cm; stony ashy silt loam, light yellowish brown (10YR 6/4) dry, yellowish brown (10YR 5/4) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common fine and few medium and coarse roots; few fine tubular pores; 10 percent gravel and 5 percent stones; slightly acid (pH 6.5); clear wavy boundary
2EBb--41 to 64 cm; very gravelly coarse sandy loam, light yellowish brown (10YR 6/4) dry, brown (10YR 5/3) moist; single grain; loose, very friable, nonsticky and nonplastic; many fine, common medium, and few coarse roots; common fine irregular pores; 35 percent gravel, 10 percent cobbles, and 10 percent stones; slightly acid (pH 6.3); gradual smooth boundary
2Bwb--64 to 76 cm; extremely gravelly coarse sandy loam, light yellowish brown (10YR 6/4) dry, brown (10YR 5/3) moist; single grain; loose, nonsticky and nonplastic; few fine and medium roots; common fine irregular pores; 40 percent gravel, 15 percent cobbles, and 15 percent stones; slightly acid (pH 6.3); abrupt irregular boundary
2R--76 cm; granitic rock
TYPE LOCATION: Grant County, Oregon; in section 31, T. 8 S., R. 36 E.; Mount Ireland U.S. Geological Survey quadrangle; latitude 44.8246956, longitude -118.3521543, datum WGS84 (coordinates estimated from a point on a hard copy map)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--4 to 7 degrees C
Mean summer soil temperature--8 to 12 degrees C
Mean winter soil temperature--0 to 3 degrees C
Soil moisture control section--dry 45 to 60 days in summer
Depth to lithic contact--50 to 100 cm
Thickness of ash-influenced layers--36 to 41 cm
Estimated properties of layers influenced by volcanic ash
*Ammonium oxalate extractable Al + 1/2 Fe--1.0 to 2.5 percent
*0.02- to 2.0-mm fraction--40 to 60 percent
*Glass content in 0.02- to 2.0-mm fraction--60 to 90 percent
*1/3-bar bulk density--0.70 to 1.00 g/cm3
*Phosphate retention--40 to 90 percent
*15-bar water retention--5 to 12 percent (dried samples)
*8 x Si plus 2 x Fe--5 to 12 percent
Particle-size control section
*Ashy upper part--35 to 40 cm thick; 4 to 8 percent clay (weighted average); 5 to 20 percent rock fragments (weighted average)
*Loamy-skeletal lower part--15 to 60 cm thick; 3 to 5 percent clay (weighted average); 45 to 60 percent angular or subangular rock fragments (weighted average)
A horizon, and AB horizon (where present)
Moist color--10YR 3/3, 10YR 3/4, 10YR 4/3, 10YR 4/4
Dry color--10YR 5/3, 10YR 5/4, 10YR 6/3, 10YR 6/4
Fine-earth texture--ashy silt loam
Clay content--4 to 8 percent
Sand content--20 to 40 percent
Organic matter content--1 to 4 percent
Total rock fragment content--5 to 10 percent
Gravel content--5 to 10 percent
Reaction--5.6 to 6.5
Thickness--8 to 20 cm
Bw horizon
Moist color--10YR 4/4, 10YR 5/4, 10YR 6/4
Dry color--10YR 6/3, 10YR 6/4, 10YR 6/5, 10YR 7/3, 10YR 7/4, 10YR 7/5, 10YR 8/4
Fine-earth texture--ashy silt loam
Clay content--4 to 8 percent
Sand content--20 to 40 percent
Organic matter content--0.5 to 2.5 percent
Total rock fragment content--5 to 20 percent
Gravel content--5 to 15 percent
Cobble content--0 to 5 percent
Stone content--0 to 10 percent
Reaction--5.6 to 6.5
Thickness--18 to 35 cm
2EBb horizon, and 2Eb or 2Ab horizon (where present)
Moist color--10YR 4/3, 10YR 5/3
Dry color--10YR 5/3, 10YR 5/4, 10YR 6/3, 10YR 6/4, 10YR 7/3, 10YR 7/4
Fine-earth texture--sandy loam
Clay content--3 to 10 percent
Sand content--50 to 65 percent
Organic matter content--1 to 2 percent
Total rock fragment content--40 to 60 percent
Gravel content--10 to 40 percent
Cobble content--0 to 30 percent
Stone content--0 to 15 percent
Reaction--5.1 to 6.5
Thickness--18 to 25 cm
2Bwb horizon, and 2BCb horizon (where present)
Moist color--10YR 4/3, 10YR 4/4, 10YR 5/3, 10YR 5/4
Dry color--10YR 6/4, 10YR 5/4
Fine-earth texture--sandy loam
Clay content--3 to 5 percent
Sand content--50 to 65 percent
Organic matter content--0.5 to 1.5 percent
Total rock fragment content--50 to 70 percent
Gravel content--10 to 40 percent
Cobble content--15 to 20 percent
Stone content--15 to 20 percent
Reaction--5.1 to 6.5
Thickness--13 to 35 cm
2Cr horizon (where present)
Depth to weathered granite--50 to 90 cm
COMPETING SERIES:
Kingbolt--6 to 18 percent clay and 35 to 75 percent angular and subangular metavolcanic, metasedimentary, or rhyolite rock fragments, of which less than 15 percent are cobbles and stones, in loamy-skeletal part of particle-size control section
Larrupin--very deep (more than 150 cm); 30 to 60 percent volcanic glass and ashy loamy sand or ashy sandy loam in ashy part of particle-size control section; 35 to 60 percent rounded or subrounded gravel and cobbles of mixed origin from mudflow material in loamy-skeletal part of particle-size control section
Poguepoint--deep (100 to 150 cm) to lithic contact (andesitic basalt); 8 to 17 percent clay and 40 to 70 percent subangular andesitic basalt gravel, cobbles, and stones in loamy-skeletal part of particle-size control section
Raggedrock--deep (100 to 150 cm) to paralithic contact (granite); 40 to 75 percent subrounded granite fragments in loamy-skeletal part of particle-size control section
Tertoo--very deep (more than 150 cm); rounded rock fragments in loamy-skeletal part of particle-size control section
GEOGRAPHIC SETTING:
Elevation--1310 to 1870 m
Climate--cold, wet winters; warm, dry summers
Mean annual precipitation--540 to 870 mm
Mean annual air temperature--2 to 6 degrees C
Frost-free period--30 to 80 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Powderriver--on more convex upper backslopes and shoulder slopes; shallow to bedrock
Roundmeadow--in slightly convex and steeper positions of backslopes; ash layer less than 35 cm thick
Piutespring--in slightly convex and steeper positions of backslopes; ash layer less than 35 cm thick
Raggedrock--on planar lower to middle backslopes; deep to granitic rock
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Saturation during normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high
USE AND VEGETATION:
Use--watershed, timber production, recreation, wildlife habitat
Native vegetation--grand fir, Douglas-fir, western larch, ponderosa pine, Engelmann spruce, lodgepole pine, subalpine fir, Douglas maple, big huckleberry, pinegrass, pathfinder, heartleaf arnica, grouse huckleberry, elk sedge, white spirea, baldhip rose
U.S. Forest Service ecological site--dominantly ABGR/VASC and ABGR/CARU
DISTRIBUTION AND EXTENT: Blue Mountains of northeast Oregon; MLRA 43C; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Grant County, Oregon; 2018
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Ochric epipedon
*Cambic horizon--zone from 23 to 76 cm
*Andic soil properties--zone from 1 to 41 cm
*Volcanic glass--zone from 1 to 41 cm
*Particle-size control section--zone from 1 to 76 cm
*Depth to lithic contact--76 cm
National Cooperative Soil Survey
U.S.A.