LOCATION ICEDEE OR
Established Series
IRD. RJO/DAL/KMS
01/2019
ICEDEE SERIES
Landscape--mountains
Landform--mass failures on mountain slopes, landslides on mountain slopes, mountain slopes
Slope--0 to 30 percent
Parent material--thick mantle of volcanic ash over residuum derived from soft tuffaceous sediment
Mean annual precipitation--about 680 mm
Mean annual air temperature--about 4 degrees C
Depth class--deep or very deep to paralithic contact
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Ashy over loamy, amorphic over isotic Alfic Vitricryands
TYPICAL PEDON: Icedee ashy silt loam in an area of woodland, on a 19-percent, north-facing slope at an elevation of about 1713 m (Soil textures are apparent field textures.)
Oi--0 to 3 cm; leaves and twigs
A--3 to 13 cm; ashy silt loam, brown (7.5YR 5/3) dry, dark brown (7.5YR 3/3) moist; weak medium subangular blocky structure parting to weak fine subangular blocky; soft, very friable, nonsticky and nonplastic; weakly smeary; common very fine and fine and few medium roots; common very fine and fine irregular pores and common very fine tubular pores; 2 percent gravel; moderately acid (pH 6.0); clear wavy boundary
Bw--13 to 38 cm; ashy silt loam, light brown (7.5YR 6/3) dry, brown (7.5YR 4/4) moist; weak medium subangular blocky structure parting to weak fine subangular blocky; soft, very friable, nonsticky and nonplastic; weakly smeary; common very fine, fine, and medium roots; common very fine tubular and irregular pores; 2 percent gravel; slightly acid (pH 6.3); abrupt wavy boundary
2Eb--38 to 51 cm; gravelly clay loam, pink (7.5YR 7/3) dry, brown (7.5YR 5/4) moist; weak fine angular blocky structure parting to very fine subangular blocky; slightly hard, friable, moderately sticky and moderately plastic; common very fine and few fine roots; common very fine and fine tubular pores and common very fine irregular pores; 24 percent gravel and 10 percent cobbles; slightly acid (pH 6.2); clear wavy boundary
2Btb1--51 to 64 cm; gravelly clay loam, pink (7.5YR 7/4) dry, strong brown (7.5YR 5/6) moist; moderate fine angular blocky structure parting to very fine angular blocky; hard, very firm, moderately sticky and moderately plastic; few very fine and fine roots; few very fine irregular pores; common faint clay films on ped faces; 24 percent gravel and 5 percent cobbles; slightly acid (pH 6.2); clear wavy boundary
2Btb2--64 to 142 cm; clay, pink (7.5YR 8/3) dry, brownish yellow (10YR 6/6) moist; weak medium subangular blocky structure parting to moderate fine subangular blocky; extremely hard, very firm, very sticky and very plastic; few very fine roots; few very fine irregular pores; 5 percent gravel and 2 percent cobbles; many distinct clay films on ped faces; moderately acid (pH 5.6); abrupt wavy boundary
2Cr--142 cm; soft tuff
TYPE LOCATION: Grant County, Oregon, about 470 m south and 650 m east of the northwest corner of section 10, T. 8 S., R. 35.5 E.; latitude 44.8857712, longitude -118.4094801, datum WGS 84 (coordinates and PLSS details estimated from a point on a hard copy map)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--about 4 to 5 degrees C
Mean summer soil temperature--about 7 to 8 degrees C
Mean winter soil temperature--about 0 to 2 degrees C
Soil moisture--dry 30 to 45 days in summer
Depth to paralithic contact--100 to 200 cm from the mineral surface
Thickness of ash-influenced layers--35 to 45 cm
Estimated properties of layers influenced by volcanic ash
*Ammonium oxalate extractable Al + 1/2 Fe--1.5 to 3.0 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--0.65 to 1.00 g/cm3
*Phosphate retention--60 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 part--35 to 45 cm thick; 5 to 10 percent clay; 0 to 2 percent rock fragments
*Loamy part--13 to 30 cm thick; 24 to 34 percent clay; 15 to 34 percent rock fragments
*Clayey part--40 to 55 cm thick; 35 to 50 percent clay; 0 to 34 percent rock fragments
A horizon
Moist color--5YR 4/2, 7.5YR 3/3, 7.5YR 4/4, 10YR 3/6
Dry color--7.5YR 5/3, 7.5YR 6/2, 7.5YR 6/3, 10YR 6/4
Fine-earth texture--ashy silt loam
Clay content--5 to 10 percent
Sand content--35 to 40 percent
Organic matter content--3 to 6 percent
Total rock fragment content--0 to 2 percent
Gravel content--0 to 2 percent
Reaction--5.1 to 6.5
Thickness--10 to 25 cm
Bw horizon
Moist color--7.5YR 4/3, 7.5YR 4/4, 10YR 5/3, 10YR 5/6
Dry color--7.5YR 6/3, 7.5YR 8/2, 10YR 6/3, 10YR 8/3
Fine-earth texture--ashy silt loam
Clay content--5 to 10 percent
Sand content--17 to 45 percent
Organic matter content--1 to 3 percent
Total rock fragment content--0 to 2 percent
Gravel content--0 to 2 percent
Reaction--5.6 to 6.5
Base saturation (sum of bases)--25 to 50 percent
Thickness--20 to 25 cm
2Eb horizon
Moist color--5YR 4/2, 7.5YR 5/4, 10YR 5/4
Dry color--7.5YR 5/2, 7.5YR 7/3, 10YR 5/3, 10YR 7/3
Fine-earth texture--clay loam, loam
Clay content--24 to 34 percent
Sand content--20 to 40 percent
Organic matter content--1.0 to 3.5 percent
Total rock fragment content--15 to 35 percent
Gravel content--10 to 25 percent
Cobble content--5 to 10 percent
Reaction--5.6 to 6.5
Base saturation (sum of bases)--60 to 80 percent
Thickness--13 to 30 cm
2Btb horizon
Moist color--7.5YR 4/3, 7.5YR 5/6, 10YR 4/3, 10YR 5/3, 10YR 5/4, 10YR 5/6, 10YR 6/4, 10YR 6/6
Dry color--7.5YR 5/3, 7.5YR 6/2, 7.5YR 7/4, 7.5YR 8/3, 10YR 4/3, 10YR 5/3, 10YR 6/3, 10YR 6/4, 10YR 7/4
Fine-earth texture--clay, clay loam, sandy clay loam
Clay content--35 to 50 percent
Sand content--20 to 40 percent
Organic matter content--0.3 to 2 percent
Total rock fragment content--0 to 35 percent
Gravel content--0 to 25 percent
Cobble content--0 to 25 percent
Reaction--5.6 to 7.3
Combined thickness--28 to 130 cm
COMPETING SERIES:
Mountireland--deep or very deep (100 to 200 cm) to paralithic contact (andesite, basalt); ashy silt loam and amorphic mineralogy in upper part of particle-size control section; argillic horizon that is 18 to 34 percent clay and clay films on ped faces throughout matrix in lower part of particle-size control section; formed in volcanic ash over residuum derived from andesite or basalt
GEOGRAPHIC SETTING:
Elevation--1450 to 1700 m
Climate--cold, wet winters; cool, moist summers
Mean annual precipitation--520 to 780 cm
Mean annual air temperature--3 to 5 degrees C
Frost-free period--30 to 100 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Andic Haplocryalfs--on toeslopes and benches of frost pocket basins; 100 to 150 cm to lithic contact; ash mantle 20 to 35 cm thick
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Saturation during normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high over moderately low
USE AND VEGETATION:
Use--timber production, watershed, wildlife, recreation, livestock grazing
Native vegetation--lodgepole pine, subalpine fir, Engelmann spruce, grand fir, grouse huckleberry, heartleaf arnica, pinemat manzanita, northwestern sedge, sidebells wintergreen, myrtle pachystima, white hawkweed
Plant association--dominantly PICO(ABLA)/VASC; may include ABLA/LIBOL2 and PICO(ABGR)/VASC/CARU
DISTRIBUTION AND EXTENT: Central Blue Mountains of northeastern Oregon; MLRA E43; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Umatilla National Forest, Oregon; 2018
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Ochric epipedon
*Cambic horizon--zone from 13 to 38 cm
*Argillic horizon--zone from 48 to 142 cm
*Volcanic glass--zone from 3 to 38 cm
*Andic soil properties--zone from 3 to 38 cm
*Particle-size control section--ashy in zone from 3 to 38 cm; loamy in zone from 38 to 51 cm; clayey in zone from 51 to 104 cm
In the typical pedon, the 2Eb horizon is 13 cm thick but it ranges from 13 to 28 cm thick. This layer is classified as in the loamy particle-size family. Because the 2Eb horizon is 13 cm thick or more, the soil classifies as ashy over loamy. The clayey 2Bt horizon is separated from the ashy part by more than 13 cm. The loamy part is not strongly contrasting to the clayey part; therefore, the soil does not classify as aniso. Base saturation is inferred from laboratory data for the Btree series.
National Cooperative Soil Survey
U.S.A.