LOCATION SPODUE OR
Tentative Series
IRD. CEG
02/2025
SPODUE SERIES
Landscape--Intermontane Basin and Lava Plateau
Landform--hills and scarps
Slope--10 to 45 percent
Parent material--coarse pumiceous volcanic ash and pumice parafragments and gravelly and sandy colluvium derived from volcanic rock and volcanic ash and pumiceous tephra
Mean annual precipitation--about 470 mm
Mean annual air temperature--about 6 degrees C
Depth class--very deep
Drainage class--somewhat excessively drained
Soil moisture regime--xeric
Soil temperature regime--frigid
Soil moisture subclass--typic
TAXONOMIC CLASS: Ashy, glassy, frigid Humic Vitrixerands
TYPICAL PEDON: Spodue ashy loamy coarse sand on the sideslope of a hill in rangeland with scattered ponderosa pine with a slope of 22 percent and an elevation of 1455 m
Oi--0 to 1 cm; slightly decomposed plant material; abrupt smooth boundary
A1--1 to 20 cm; ashy loamy coarse sand, brown (10YR 5/3) dry, very dark grayish brown (10YR 3/2) moist; weak fine granular structure; very friable, soft, nonsticky and nonplastic; common fine and many very fine roots throughout; common fine dendritic tubular pores; 1 percent fine pumice paragravel and 2 percent fine gravel; slightly alkaline (pH 7.6); gradual wavy boundary
A2--20 to 38 cm; ashy loamy coarse sand, grayish brown (10YR 5/2) dry, dark brown (7.5YR 3/2) moist; weak medium subangular blocky structure; very friable, soft, nonsticky and nonplastic; few very fine and fine and common medium and coarse roots throughout; few fine dendritic tubular pores; 1 percent fine pumice paragravel and 5 percent fine gravel; slightly alkaline, (pH 7.4); gradual smooth boundary
A3--38 to 75 cm; ashy loamy coarse sand, brown (10YR 5/3) dry, dark brown (7.5YR 3/2) moist; weak medium subangular blocky structure; very friable, soft, nonsticky and nonplastic; few very fine, fine, medium, and coarse roots throughout; few fine dendritic tubular pores; 1 percent fine pumice paragravel and 10 percent fine and medium gravel; neutral (pH 7.2); gradual smooth boundary
AC--75 to 125 cm; gravelly ashy coarse sand, brown (10YR 5/3) dry, dark brown (7.5YR 3/3) moist; single grain; loose, nonsticky and nonplastic; few very fine, fine, medium, and coarse roots throughout; few fine dendritic tubular pores; 1 percent fine pumice paragravel and 25 percent fine and medium gravel; neutral (pH 7.2); gradual smooth boundary
C1--125 to 150 cm; very gravelly ashy coarse sand, pale brown (10YR 6/3) dry, dark yellowish brown (10YR 3/4) moist; single grain; loose, nonsticky and nonplastic; few very fine, fine, medium, and coarse roots throughout; few fine dendritic tubular pores; 1 percent fine pumice paragravel; 50 percent fine and medium gravel and 1 percent cobbles; slightly alkaline (pH 7.4); gradual smooth boundary
C2--150 to 200 cm; ashy coarse sand, pale brown (10YR 6/3) dry, dark yellowish brown (10YR 3/4) moist; single grain; loose, nonsticky and nonplastic; few very fine and fine roots throughout; 1 percent fine pumice paragravel and 5 percent fine and medium gravel; slightly alkaline (pH 7.6)
TYPE LOCATION: Klamath County, Oregon; about 6.5 miles north and 0.7 miles east of the town of Beatty, OR; about 692 m south and 72 m west of the northeast corner of sec. 14, T.35S., R.12E., Willamette Meridian; Spodue Mountain, Oregon USGS quadrangle; latitude 42.5369830 degrees north, longitude 121.2524800 degrees west, datum WGS84 (coordinates derived from gps unit)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature-- 6 to 8 degrees C
Moisture control section--30 to 90 cm; dry for 60 to 90 consecutive days within the four-month period following the summer solstice
Thickness of mollic epipedon--25 to 140 cm
Rock fragment type--pumice paragravel; volcanic rock gravel and cobbles
Particle-size control section
*Rock fragment content, weighted average--0 to 20 percent
*Pararock fragment content, weighted average--0 to 8 percent
*Clay content--5 to 18 percent
Estimated properties within the particle-size control section
*Volcanic glass content--30 to 70 percent
*Medium to very coarse sand in the .02 to 2.0 mm fraction--greater than 50 percent
*Ammonium oxalate extractable Al+1/2Fe--0.4 to 1.0 percent
*P-retention--25 to 50 percent
*1/3-bar bulk density--0.75 to 1.0 g/cm3
*1500 kPa water (air-dried samples)--3 to 12 percent
*[(Al+1/2Fe)*15.65)]+glass--40 to 80 percent
Oi horizons (when present)
Fine-earth texture--slightly decomposed organic matter (from needles, leaves and twigs)
Thickness (combined)--0 to 4 cm
A horizons
Hue--10YR or 7.5YR, moist or dry
Value--2 to 3 moist, 4 or 5 dry
Chroma--1 to 3 moist, 2 or 3 dry
Fine-earth texture--ashy loamy coarse sand, ashy coarse sandy loam, ashy sandy loam
Clay content--5 to 18 percent
Total rock and pararock content--0 to 10 percent
Paragravel content--0 to 8 percent
Gravel content--0 to 10 percent
Reaction--neutral to slightly alkaline (pH 6.6 to 7.8)
Combined thickness--25 to 120 cm
AC horizons (when present)
Hue--10YR or 7.5YR, moist or dry
Value--3 moist, 5 dry
Chroma--2 or 3 moist, 3 or 4 dry
Fine-earth texture--ashy coarse sand, ashy loamy coarse sand, ashy coarse sandy loam, ashy sandy loam
Clay content--2 to 18 percent
Total rock and pararock content--0 to 35 percent
Paragravel content--0 to 8 percent
Gravel content--0 to 35 percent
Cobble content--0 to 5 percent
Reaction--neutral to slightly alkaline (pH 6.6 to 7.8)
Combined thickness--0 to 75 cm
C horizons
Hue--10YR or 7.5YR, moist or dry
Value--3 to 6 moist, 5 to 7 dry
Chroma--3 or 4 moist, 3 to 6 dry
Fine-earth texture--ashy coarse sand, ashy loamy coarse sand, ashy coarse sandy loam, ashy sandy loam
Clay content--2 to 18 percent
Total rock and pararock content--0 to 35 percent
Paragravel content--0 to 8 percent
Gravel content--0 to 55 percent
Cobble content--0 to 20 percent
Reaction--neutral to slightly alkaline (pH 6.6 to 7.8)
COMPETING SERIES:
Cobey--silt loam or loam textures, with less than 50 percent medium to very coarse sand in the .02 to 2.0 mm fraction; glacial till below 100 cm
Drypok--moderately deep (50 to 100 cm) to a paralithic contact
Ermabell--lithologic discontinuity, with skeletal glacial outwash material and alluvium at 100 to 150 cm; dry for 90 to 110 days after the summer solstice
Laidlaw--lithologic discontinuity, with alluvium in the lower part of the soil; 2Bq horizons with 5 to 30 percent hard firm silica nodules; dry for 90 to 110 days after the summer solstice
Lundgren--lithologic discontinuity, with skeletal glacial outwash material at 50 to 100 cm; dry for 90 to 110 days after the summer solstice
Pilotbutte--2 to 5 percent clay in the particle-size control section
Retep--moderately deep (50 to 100 cm) to a paralithic contact with weathered andesite
Suttle--umbric epipedon; high water table at 0 to 60 cm from April to June; 15 to 35 percent gravel size cinders in the particle-size control section; lithologic discontinuity, with skeletal glacial outwash material at 50 to 75 cm;
Trailcreek--moderately deep (50 to 100 cm) to a paralithic contact
Wanoga--moderately deep (50 to 100 cm) to a lithic contact; dry for 90 to 110 days after the summer solstice
GEOGRAPHIC SETTING:
Elevation--1330 to 1530 m
Climate--cold wet winters and cool dry summers
Mean annual air temperature--4 to 7 degrees C
Mean annual precipitation--350 to 610 mm
Frost-free period--60 to 80 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Choptie--shallow (25 to 50 cm) to a lithic contact; on ridges, rock pediments, and low hills
Fuego--moderately deep (50 to 100 cm) to a lithic contact; loamy-skeletal particle-size control section; on ridges and volcanic cones;
Maset--moderately deep (50 to 100 cm) to a lithic contact; ashy over loamy-skeletal particle-size control section; on hills on volcanic fields
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--somewhat excessively drained
Saturated hydraulic conductivity--high to very high
USE AND VEGETATION:
Use--timber production, livestock grazing, wildlife habitat
Vegetation--ponderosa pine, western juniper, antelope bitterbrush, curl-leaf mountain mahogany, mountain big sagebrush, Sandberg bluegrass, and Idaho fescue
DISTRIBUTION AND EXTENT: Cascade Mountains, Eastern Slope, Oregon; MLRA 6; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED:
Klamath County, Northern Part, Oregon, 2015
Origin of the name--named after a nearby mountain and USGS topo quad name, Spodue Mountain
REMARKS:
Diagnostic horizons and features in this pedon
*Particle-size control section--the zone from 1 to 101 cm
*Mollic epipedon--the zone from 1 to 125 cm
*Andic soil properties--zone from 1 to 200 cm
ADDITIONAL DATA:
NASIS SITE ID--2015OR035018
NASIS PEDON ID--2015OR035018
National Cooperative Soil Survey
U.S.A.