LOCATION EASTLAKESBASIN OR
Established Series
IRD. RJO/DAL/KMS
11/2018
EASTLAKESBASIN SERIES
Landscape--mountains
Landform--mountain slopes
Slope--0 to 90 percent
Parent material--colluvium derived from basalt mixed with loess and an influence of volcanic ash throughout
Mean annual precipitation--about 1150 mm
Mean annual air temperature--about 1 degree C
Depth class--shallow to lithic bedrock
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Loamy-skeletal, isotic Lithic Humicryepts
TYPICAL PEDON: Eastlakesbasin very gravelly ashy silt loam in an area of rangeland, on an 18-percent, convex, east-facing summit at an elevation of 2425 m
A--0 to 18 cm; very gravelly ashy silt loam, brown (7.5YR 4/3) dry, very dark brown (7.5YR 2.5/3) moist; weak very fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine and fine and few medium roots; common very fine irregular pores; 45 percent gravel, 5 percent cobbles, and 5 percent stones; slightly acid (pH 6.1); clear wavy boundary
AB--18 to 30 cm; extremely gravelly ashy silt loam, brown (7.5YR 4/3) dry, very dark brown (7.5YR 2.5/3) moist; weak very fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine and fine and few medium and coarse roots; common very fine irregular pores; 50 percent gravel, 15 percent cobbles, and 10 percent stones; moderately acid (pH 5.6); abrupt irregular boundary
R--30 cm; metavolcanic rock
TYPE LOCATION: Wallowa County, Oregon; in the NW1/4SW1/4SE1/4 of section 27, T. 3 S., R. 45 E.; Joseph U.S. Geological Survey quadrangle; latitude 45.2672805, longitude -117.1732962, datum WGS 84 (coordinates estimated from pin prick on hard copy map)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--0 to 3 degrees C
Mean summer soil temperature--4 to 7 degrees C
Mean winter soil temperature-- -4 to -1 degree C
Soil moisture--dry 45 to 60 consecutive days in summer
Thickness of umbric epipedon--25 to 50 cm
Depth to lithic contact--25 to 50 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
*Phosphate retention--60 to 70 percent
*15-bar water retention--10 to 15 percent (dried samples)
Particle-size control section
*Clay content--5 to 15 percent
*Total rock fragment content--60 to 85 percent
A horizon
Moist color--7.5YR 2.5/2, 7.5YR 2.5/3, 7.5YR 3/3, 10YR 3/3
Dry color--7.5YR 4/2, 7.5YR 4/3, 10YR 4/3
Fine-earth texture--ashy loam, ashy silt loam, ashy sandy loam
Clay content--2 to 15 percent
Sand content--35 to 65 percent
Organic matter content--2 to 8 percent
Total rock fragment content--45 to 70 percent
Gravel content--25 to 60 percent
Cobble content--0 to 15 percent
Stone content--0 to 15 percent
Reaction--5.6 to 6.5
Thickness--8 to 30 cm
AB horizon
Moist color--7.5YR 2.5/3, 7.5YR 3/3, 10YR 3/3
Dry color--7.5YR 4/3, 10YR 3/4, 10YR 4/3, 10YR 5/3
Fine-earth texture--ashy loam, ashy silt loam, ashy sandy loam
Clay content--4 to 12 percent
Sand content--30 to 55 percent
Organic matter content--1 to 5 percent
Total rock fragment content--65 to 70 percent
Gravel content--40 to 75 percent
Cobble content--0 to 20 percent
Stone content--0 to 15 percent
Reaction--5.6 to 6.5
Thickness--13 to 35 cm
COMPETING SERIES:
Burgerbutte--formed in colluvium derived from basalt
Crawfish--very shallow (10 to 25 cm) to lithic contact; formed in colluvium and residuum derived from basalt or andesitic basalt
Goodnews--no volcanic glass
Snowtell--very shallow (10 to 25 cm) to lithic contact; formed in reworked till derived from volcanic rock; no cambic horizon; xeric soil moisture regime; 60 to 75 consecutive dry days
Telluride--no volcanic ash
GEOGRAPHIC SETTING:
Elevation--1610 to 2480 m
Climate--cold, wet winters; cool, moist summers
Mean annual precipitation--730 to 1680 mm
Mean annual air temperature--about 0 to 4 degrees C
Frost free period--15 to 40 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Angelpeak--on concave to planar backslopes; under closed-canopy subalpine fir forest; volcanic ash mantle; deep to bedrock
Bordengulch--on concave or planar backslopes; under closed-canopy subalpine fir forest; thin volcanic ash mantle; moderately deep
Clarkscreek--on planar to convex glaciated backslopes; under grassland and scattered forested areas; mixed volcanic ash mantle; moderately deep to bedrock
Fruitcreek (T)--on planar backslopes; under mountain shrub and widely scattered forested areas; minor influence of volcanic ash; moderately deep to bedrock
Towermountain (T)--on planar or concave backslopes and in basins; under closed-canopy subalpine fir forest; volcanic ash mantle; moderately deep to bedrock
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Saturation during normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--moderately high or high
USE AND VEGETATION:
Use--watershed, recreation, timber production, wildlife habitat
Native vegetation--greenleaf fescue, lupine, grand fir, Engelmann spruce, western larch, Douglas-fir, western needlegrass, white hawkweed, aster, weevil microseris, big huckleberry, grouse huckleberry, common yarrow, mountain big sagebrush, northern twinflower, Idaho fescue, singleleaf pinyon, bluebunch wheatgrass, bearded wheatgrass, Hood sedge, Ross' sedge, heartleaf arnica, Sandberg bluegrass, elk sedge, pinegrass, baldhip rose, Columbia brome, northwestern sedge, prince's pine
DISRIBUTION AND EXTENT: Wallowa and Blue Mountains of northeastern Oregon; MLRA 10; 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 30 cm
*Volcanic glass--zone from the surface to a depth of 30 cm
*Particle-size control section--zone from the surface to a depth of 30 cm
*High base saturation (eutric)--zone from 8 to 30 cm
National Cooperative Soil Survey
U.S.A.