LOCATION LEESPEAK OR
Established Series
IRD. RJO/JLW/DAL/KMS
01/2019
LEESPEAK SERIES
Landscape--mountains
Landform--mountain slopes
Slope--60 to 90 percent
Parent material--colluvium derived from granite with an influence of volcanic ash in the upper part
Mean annual precipitation--about 880 mm
Mean annual air temperature--about 2 degrees C
Depth class--moderately deep to lithic bedrock
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Loamy-skeletal, isotic Vitrixerandic Humicryepts
TYPICAL PEDON: Leespeak gravelly ashy sandy loam in an area of rangeland, on a 65-percent, south-facing slope at an elevation of 2100 m (Soil textures are apparent field textures.)
A--0 to 25 cm; gravelly ashy sandy loam, brown (10YR 4/3) dry, very dark brown (10YR 2/2) moist; weak very fine granular structure; loose, very friable, nonsticky and nonplastic; many very fine and fine and few medium roots; common fine and few medium irregular pores; 25 percent gravel; slightly acid (pH 6.3); gradual smooth boundary
AB--25 to 41 cm; very gravelly ashy sandy loam, brown (10YR 4/3) dry, dark brown (10YR 3/3) moist; weak medium and fine granular structure; soft, very friable, nonsticky and nonplastic; common very fine, fine, and medium roots throughout; few fine irregular and tubular pores; 35 percent gravel; slightly acid (pH 6.4); gradual smooth boundary
2Bw--41 to 94 cm; very gravelly sandy loam, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; weak very fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine and few fine roots throughout; few fine tubular pores; 45 percent gravel and 5 percent cobbles; slightly acid (pH 6.4); abrupt irregular boundary
2R--94 cm; granite
TYPE LOCATION: Baker County, Oregon, about 58 m north and 233 m west of the southeast corner of section 1, T. 6 S., R. 43 E.; Bennett Peak U.S. Geological Survey quadrangle; latitude 45.0651721, longitude -117.3848511, datum WGS 84 (coordinates and PLSS details estimated from a point on a hard copy map)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--about 1 to 4 degrees C
Mean summer soil temperature--about 4 to 8 degrees C
Mean winter soil temperature--about -3 to 2 degrees C
Soil moisture--dry 45 to 60 consecutive days in summer
Thickness of umbric epipedon--50 to 100 cm
Depth to lithic contact--50 to 100 cm
Thickness of ash-influenced layers--35 to 70 cm
Estimated properties of layers influenced by volcanic ash
*Ammonium oxalate extractable Al + 1/2 Fe--0.7 to 1.0 percent
*Glass content in 0.02- to 2.0-mm fraction--5 to 25 percent
Particle-size control section
*Clay content--3 to 10 percent
*Total rock fragment content--35 to 55 percent
A horizon
Moist color--7.5YR 3/2, 7.5YR 3/3, 10YR 2/2, 10YR 3/2, 10YR 3/3
Dry color--7.5YR 5/4, 10YR 4/3, 10YR 5/3
Fine-earth texture--ashy silt loam, ashy sandy loam, ashy loam
Clay content--2 to 10 percent
Sand content--35 to 60 percent
Organic matter content--2 to 6 percent
Total rock fragment content--25 to 50 percent
Gravel content--15 to 50 percent
Cobble content--0 to 15 percent
Stone content--0 to 10 percent
Reaction--5.6 to 6.5
Base saturation (NH4OAc)--40 to 50 percent
Thickness--18 to 35 cm
AB horizon
Moist color--7.5YR 3/3, 10YR 2/2, 10YR 3/3
Dry color--7.5YR 3/2, 7.5YR 4/4, 7.5YR 5/4, 10YR 4/3, 10YR 4/4, 10YR 5/3, 10YR 5/4
Fine-earth texture--ashy silt loam, ashy sandy loam, ashy loam
Clay content--3 to 10 percent
Sand content--35 to 70 percent
Organic matter content--1 to 3 percent
Total rock fragment content--35 to 55 percent
Gravel content--15 to 40 percent
Cobble content--0 to 20 percent
Stone content--0 to 20 percent
Reaction--5.6 to 6.5
Base saturation (NH4OAc)--40 to 50 percent
Thickness--15 to 40 cm
Bw horizon, or BA horizon (where present)
Moist color--7.5YR 3/3, 10YR 3/3
Dry color--7.5YR 5/4, 10YR 4/4, 10YR 5/4
Fine-earth texture--sandy loam, loamy sand
Clay content--3 to 8 percent
Sand content--70 to 85 percent
Organic matter content--0.5 to 2.0 percent
Total rock fragment content--35 to 55 percent
Gravel content--25 to 45 percent
Cobble content--0 to 15 percent
Stone content--0 to 15 percent
Reaction--5.6 to 6.5
Base saturation (NH4OAc)--25 to 50 percent
Thickness--13 to 45 cm
COMPETING SERIES:
Dollarlake--no lithic contact within a depth of more than 150 cm; base saturation (NH4OAc) 50 percent or more in more than one-half of thickness between depths of 25 and 75 cm (eutric); rounded or subrounded basalt till fragments
Fruitcreek (T)--base saturation (NH4OAc) 50 percent or more in more than one-half of thickness between depths of 25 and 75 cm (eutric); angular argillite and metasedimentary colluvium fragments
Granitemountain (T)--no lithic contact within a depth of more than 150 cm
GEOGRAPHIC SETTING:
Elevation--2170 to 2460 m
Climate--cold, wet winters; cool, dry summers
Mean annual precipitation--770 to 990 mm
Mean annual air temperature--0 to 3 degrees C
Frost-free period--20 to 60 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Rockcreekbutte--on steep, convex backslopes and shoulders; under open subalpine fir and whitebark pine forest
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, recreation, livestock grazing
Native vegetation-- elk sedge, mountain big sagebrush, phlox, sandwort, western needlegrass, buckwheat, white hawkweed, mountain brome, common yarrow, mountain snowberry
Plant association--dominantly FEVI/LULA2; may include ARTRV/CAGE and ARTRV/FEID
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 the surface to a depth of 94 cm
*Particle-size control section--zone from 25 to 94 cm
*Volcanic glass--zone from the surface to a depth of 41 cm
*Low base saturation (dystric)--zone from the surface to a depth of 94 cm; less than 50 percent throughout profile
National Cooperative Soil Survey
U.S.A.