LOCATION MCNAMEE OR
Established Series
IRD. JLW/RJO/DAL/KMS
02/2019
MCNAMEE SERIES
Landscape--mountains, plateaus
Landform--mountain slopes, plateaus, landslides on mountain slopes
Slope--0 to 60 percent
Parent material--thin mantle of volcanic ash over colluvium derived from andesite or basalt
Mean annual precipitation--about 760 mm
Mean annual air temperature--about 3 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Loamy-skeletal, isotic Andic Haplocryalfs
TYPICAL PEDON: McNamee ashy silt loam, forested, on a 34-percent, northwest-facing slope at an elevation of 1744 m
Oi--0 to 1 cm; slightly decomposed needles
Oe--1 to 3 cm; moderately decomposed forest litter
A--3 to 13 cm; ashy silt loam, light yellowish brown (10YR 6/4) dry, dark yellowish brown (10YR 3/4) moist; weak fine and medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; common fine, medium, and coarse roots; few fine irregular pores; 5 percent gravel; slightly acid (pH 6.5); clear wavy boundary
Bw--13 to 28 cm; ashy silt loam, very pale brown (10YR 8/4) dry, yellowish brown (10YR 5/6) moist; weak medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; few fine and common medium and coarse roots; 5 percent gravel; neutral (pH 7.0); abrupt wavy boundary
2Eb--28 to 46 cm; gravelly silt loam, pale brown (10YR 6/3) dry, brown (10YR 4/3) moist; weak medium subangular blocky structure parting to moderate fine subangular blocky; slightly hard, friable, moderately sticky and slightly plastic; common fine, medium, and coarse roots; few fine and medium irregular pores and few fine tubular pores; 15 percent gravel, 5 percent cobbles, and 3 percent stones; slightly acid (pH 6.5); clear smooth boundary
2Btb--46 to 91 cm; extremely gravelly loam, brownish yellow (10YR 6/6) dry, dark yellowish brown (10YR 4/6) moist; moderate fine angular blocky structure parting to moderate very fine angular blocky; hard, firm, moderately sticky and moderately plastic; many thin clay films on ped faces and rock fragments; few fine, medium, and coarse roots; few fine irregular pores; 75 percent gravel; slightly acid (pH 6.1); gradual smooth boundary
2BCb--91 to 155 cm; extremely gravelly loam, brownish yellow (10YR 6/6) dry, yellowish brown (10YR 5/6) moist; weak fine and very fine subangular blocky structure; hard, firm, moderately sticky and moderately plastic; few thin clay films on ped faces and rock fragments; few fine roots in cracks; few fine irregular pores; 85 percent gravel; slightly acid (pH 6.1)
TYPE LOCATION: Grant County, Oregon, about 542 m east and 130 m south of the northwest corner of section 4, T. 10 S., R. 35.5 E.; latitude 44.729301, longitude -118.4261009 datum WGS 84 (coordinates and PLSS details estimated from point on hard copy map)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--about 2 to 4 degrees C
Mean summer soil temperature--about 5 to 8 degrees C
Mean winter soil temperature--about -2 to 1 degrees C
Soil moisture--dry 30 to 45 consecutive days in summer
Thickness of ash-influenced layers--20 to 35 cm
Estimated properties of layers influenced by volcanic ash
*Ammonium oxalate extractable Al + 1/2 Fe--1.6 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 0.9 g/cm3
*Phosphate retention--60 to 90 percent
*15-bar water retention--5 to 12 to percent (dried samples)
*8 x Si plus 2 x Fe--5 to 12 percent
Particle-size control section
*Clay content--18 to 33 percent
*Total rock fragment content--35 to 75 percent
A horizon, and AB or AE horizon (where present)
Moist color--10YR 3/4, 10YR 4/1, 10YR 4/3
Dry color--10YR 5/2, 10YR 5/3, 10YR 5/4, 10YR 6/4
Fine-earth texture--ashy silt loam, ashy loam
Clay content--5 to 8 percent
Sand content--30 to 45 percent
Organic matter content--1.5 to 4.5 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 5 percent
Reaction--6.1 to 7.3
Thickness--5 to 13 cm
Bw horizon
Moist color--10YR 3/4, 10YR 4/3, 10YR 4/6, 10YR 5/3, 10YR 5/6
Dry color--10YR 5/4, 10YR 6/6, 10YR 7/4, 10YR 8/4
Fine-earth texture--ashy silt loam
Clay content--3 to 5 percent
Sand content--30 to 45 percent
Organic matter content--0.5 to 2.5 percent
Total rock fragment content--0 to 30 percent
Gravel content--0 to 20 percent
Cobble content--0 to 5 percent
Stone content--0 to 5 percent
Reaction--6.1 to 7.3
Thickness--15 to 30 cm
2Eb horizon, and 2BEb horizon (where present)
Moist color--10YR 4/3, 10YR 4/4, 10YR 5/3, 10YR 6/2
Dry color--10YR 5/4, 10YR 6/3, 10YR 7/2, 10YR 7/3
Fine-earth texture--silt loam, loam
Clay content--10 to 20 percent
Sand content--35 to 50 percent
Organic matter content--1 to 2 percent
Total rock fragment content--25 to 45 percent
Gravel content--10 to 40 percent
Cobble content--0 to 20 percent
Stone content--0 to 10 percent
Reaction--5.6 to 6.1
Thickness--18 to 50 cm
2Btb horizon
Moist color--10YR 4/6, 10YR 5/3, 10YR 5/4, 10YR 6/2
Dry color--10YR 6/4, 10YR 6/6, 10YR 7/2, 10YR 8/2
Fine-earth texture--clay loam, loam
Clay content--18 to 35 percent
Sand content--30 to 45 percent
Organic matter content--0.5 to 2.0 percent
Total rock fragment content--35 to 75 percent
Gravel content--15 to 75 percent
Cobble content--0 to 30 percent
Stone content--0 to 15 percent
Reaction--5.6 to 6.1
Thickness--30 to 50 cm
2BCb horizon, and 2C horizon (where present)
Moist color--10YR 5/2, 10YR 5/3, 10YR 5/4, 10YR 5/6, 10YR 7/2
Dry color--10YR 6/4, 10YR 6/6, 10YR 7/3, 10YR 8/1, 10YR 8/2
Fine-earth texture--clay loam, loam
Clay content--17 to 35 percent
Sand content--30 to 45 percent
Organic matter content--0.5 to 2.0 percent
Total rock fragment content--45 to 85 percent
Gravel content--15 to 85 percent
Cobble content--0 to 30 percent
Stone content--0 to 15 percent
Reaction--5.6 to 6.1
COMPETING SERIES:
Carioca--very deep (more than 150 cm) to paralithic contact (andesite, basalt); no buried eluvial 2Eb horizon; few faint mottles (redoximorphic) below a depth of 100 cm
Pileup--no buried eluvial 2Eb horizon; xeric moisture regime
Sherlock--formed in glacial till of mixed igneous and metasedimentary lithologies; no buried eluvial 2Eb horizon
Watsonlake--no volcanic glass in upper part
GEOGRAPHIC SETTING:
Elevation--1400 to 1970 m
Climate--cold, wet winters; cool, moist summers
Mean annual precipitation--520 to 880 mm
Mean annual air temperature--2 to 5 degrees C
Frost-free period--25 to 100 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Icedee--in planar to concave positions of moderately steep mountain slopes; 100 to 200 cm (deep, very deep) to paralithic contact (tuff); thick volcanic ash mantle over loamy argillic horizon; under subalpine fir, Engelmann spruce, lodgepole pine, big huckleberry, longtube twinflower, darkwoods violet, and pinegrass
Mountemily--on concave backslopes and footslopes; no lithic contact within a depth of more than 150 cm; thick volcanic ash mantle over loamy-skeletal colluvium; under subalpine fir, Engelmann spruce, big huckleberry, prince's pine, sidebells pyrola, and pinegrass
Mountireland--on lower backslopes and footslopes; 100 to 200 cm (deep, very deep) to paralithic contact (andesite, basalt); thick volcanic ash mantle over loamy argillic horizon; under subalpine fir, Engelmann spruce, lodgepole pine, grouse huckleberry, big huckleberry, longtube twinflower, and pinegrass
Troutmeadows--on benches and toeslopes and in swales; 50 to 100 cm (moderately deep) to lithic contact (basalt); thick volcanic ash mantle over loamy-skeletal colluvium; under subalpine fir, Engelmann spruce, grouse huckleberry, and pinegrass
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Saturation during normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--moderately high
USE AND VEGETATION:
Use--watershed, wildlife habitat, timber production, recreation
Potential native vegetation--subalpine fir, lodgepole pine, Engelmann spruce, western larch, grand fir, grouse huckleberry, twinflower, Oregon boxwood, bearberry, prince's pine, big huckleberry, roundleaf violet, sidebells pyrola, rattlesnake plantain, blueleaf strawberry, white-flowered hawkweed, pinegrass, northwest sedge, elk sedge
DISTRIBUTION AND EXTENT: Blue Mountains of northeastern Oregon; MLRA 10; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Malheur National Forest, Oregon; 2018
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Ochric epipedon
*Cambic horizon--zone from 13 to 28 cm
*Buried eluvial horizon--zone from 28 to 46 cm
*Buried argillic horizon--zone from 46 to 91 cm
*Volcanic glass--zone from 3 to 28 cm
*Andic soil properties--zone from 3 to 28 cm
*Particle-size control section--zone from 46 to 91 cm
National Cooperative Soil Survey
U.S.A.