LOCATION SHOTSPRINGS        OR
Tentative Series
IRD. JRD/DAL
06/2008

SHOTSPRINGS SERIES


The Shotsprings series consists of moderately deep, well drained soils on mountain slopes. They formed in mixed volcanic ash and colluvium over residuum from basalt. Slopes are 20 to 70 percent. The mean annual precipitation is about 22 inches and the mean annual air temperature is about 42 degrees F.

TAXONOMIC CLASS: Clayey-skeletal, smectitic, frigid Vitrandic Argixerolls

TYPICAL PEDON: Shotsprings ashy sandy loam -- upland forest, on a 55 percent convex slope, north aspect, at 5,100 feet elevation. (Colors are for dry soil unless otherwise noted; apparent field textures.)

Oi--0 to 2 inches, slightly decomposed Douglas-fir litter and duff.

A1--2 to 5 inches, brown (10YR 4/3) ashy sandy loam, very dark brown (10YR 2/2) moist: moderate thin to medium platy structure; very soft, very friable, nonsticky and nonplastic; many very fine, fine and medium roots; many very fine and fine vesicular pores; 5 percent gravel, 2 percent cobbles; slightly acid (pH 6.2); abrupt smooth boundary.

A2--5 to 12 inches, yellowish brown (10YR 5/4) ashy sandy loam, dark brown (10YR 3/3) moist; moderate fine and medium subangular blocky structure; soft, friable, nonsticky and nonplastic; many very fine, fine and medium, and common coarse roots; many very fine and fine tubular pores; 10 percent gravel, 2 percent cobbles; slightly acid (pH 6.4); clear smooth boundary. (Combined thickness of A horizons is 7 to 14 inches)

Bw--12 to 21 inches; yellowish brown (10YR 5/4) ashy sandy clay loam, dark brown (10YR 3/3) moist; moderate fine and medium subangular blocky structure; soft, friable, slightly sticky and slightly plastic; many very fine, fine and coarse roots; many very fine and fine tubular pores; 10 percent gravel, 2 percent cobbles; slightly acid (pH 6.4); clear smooth boundary. (6 to 10 inches thick)

2Bt--21 to 31 inches; yellowish brown (10YR 5/4) extremely cobbly sandy clay; dark brown (10YR 3/3) moist; moderate fine and medium angular blocky structure, slightly hard, firm, slightly sticky and moderately plastic; common fine and medium roots; common very fine and fine tubular pores; many distinct moderately thick clay films on ped faces and lining pores; 20 percent gravel, 50 percent cobbles, 2 percent stones; slightly acid (pH 6.4) abrupt smooth boundary. (6 to 22 inches thick)

2R--31 inches; basalt

TYPE LOCATION: Crook County, Oregon, on Ochoco Forest Road 1680-663 in central Maury Mountains
Section 27, (N1/2 of N1/2) T. 17 S, R. 20 E.
Latitude: 44 degrees, 3 minutes, 50.6 seconds N;
Longitude: 120 degrees, 18 minutes, 59.7 seconds W
UTM coordinates: zone 10; 4,882,272.5 northing; 714,917.8 easting; NAD 27

RANGE IN CHARACTERISTICS:
Soil temperature regime: frigid
Mean annual soil temperature: 37 to 41 degrees F.
Mean summer soil temperature: 44 to 49 degrees F.
Mean winter soil temperature: 32 to 36 degrees F.
Soil moisture: xeric regime, dry 45 to 60 consecutive days in summer and early fall

Particle-size control section: upper 20 inches of the argillic horizon
clay content (weighted average): 35 to 55 percent
rock fragment content (weighted average): 35 to 85 percent

Diagnostic horizons and features:
thickness of andic soil properties: 7 to 14 inches
mollic epipedon: 13 to 20 inches thick
lithic contact, depth below mineral surface: 20 to 40 inches

A horizons
andic soil properties
Al+1/2Fe: 0.4 to 1.0 percent (ammonium oxalate)
P retention: 25 to 50 percent
0.2 to 2.0 mm fraction: 60 to 80 percent of fine earth
glass content: 30 to 50 percent of 0.2 to 2.0 fraction
color, moist: hue 10YR; value 2 or 3; chroma 2 or 3
color dry: hue 10YR; value 3 to 5; chroma 2 to 4
texture: ASHY-SL, ASHY-LS
clay content: 10 to 18 percent
rock fragments: 5 to 15 percent
gravel: 5 to 15 percent
cobbles: 0 to 5 percent
reaction : moderately acid to slightly acid, pH: 5.8 to 6.4

Bw horizons
vitrandic soil properties
Al+1/2Fe: 0.2 to 0.4 percent (ammonium oxalate)
P retention: 15 to 25 percent
glass content: 15 to 30 percent of 0.2 to 2.0 fraction
color, moist: hue 10YR; value 2 or 3; chroma 2 or 3
color dry: hue 10YR; value 3 to 5; chroma 2 to 4
texture: ASHY-SCL, GR-ASHY-SCL, CB-ASHY-SCL
clay content: 20 to 26 percent
rock fragments: 5 to 25 percent
gravel: 5 to 20 percent
cobbles: 0 to 10 percent
reaction : moderately acid to slightly acid, pH: 5.8 to 6.4

2Bt horizons
color moist: hue 10YR, value 2 or 3, chroma 2 to 4
color dry: hue 10YR, value 3 to 5, chroma 3 or 4
texture: CBX-SC, CBX-C, CBV-SC, CBV-C
clay content: 35 to 55 percent
rock fragments: 35 to 85 percent
gravel: 25 to 30 percent
cobbles: 10 to 50 percent
stones: 0 to 5 percent
reaction: slightly acid to neutral, pH: 6.2 to 6.6

COMPETING SERIES: These are the;
Breeseranch - deep; dry for 75 to 90 consecutive days in summer;
Dupratt - mollic epipedon 20 to 30 inches thick; dry for 70 to 90 consecutive days in summer;
Erakatak lacks an O horizon
Finsel - lacks an O horizon; mollic epipedon 20 to 40 inches thick; dry 75 to 90 consecutive days in summer;
Hamtah - very deep; lacks an O horizon; mollic epipedon is 20 to 26 inches thick
Home Camp - moderately deep to paralithic contact, lacks an O horizon
Humarel - dry 60 to 75 consecutive days in summer
Lamulita - deep to a lithic contact,
Maule - dry 60 to 90 consecutive days in summer
Menbo lacks an O horizon; dry 100 to 120 consecutive days in summer
Squatterflat - very deep; dry 60 to 75 consecutive days in summer

GEOGRAPHIC SETTING:
Landform: mountain backslopes and ridges
Slope gradient: 20 to 70 percent
Parent Material: volcanic ash over mixed ash and colluvium over residuum
Lithology: basalt and rhyolite
Elevation: 4,000 to 6,000 feet
Climate: cold, wet winters and hot, dry summers
Mean annual precipitation: 20 to 25 inches
Mean annual temperature: 40 to 45 degrees F.
Frost free period: 60 to 90 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Hafmau - on mountain sideslopes and benches; shallow to bedrock; under Douglas-fir, ponderosa pine, elk sedge and heartleaf arnica
Maule - on plateau tops and mountain sideslopes; under ponderosa pine, Idaho fescue, Ross's sedge, mountain brome and yarrow
Maucros - on sideslopes and plateau tops; deep; with ash mantle 14 to 20 inches thick, under grand fir, ponderosa pine, heartleaf arnica, pinegrass and pine bluegrass
Norlo - on sideslopes and benches; very deep; with ash mantle 14 to 20 inches thick, under grand fir, Douglas-fir, ponderosa pine, pinegrass and elk sedge

DRAINAGE AND PERMEABILITY:
Drainage: well drained
Runoff: medium
Permeability: rapid in ashy surface and slow in clayey subsoil

USE AND VEGETATION:
Use: timber production, range, wildlife habitat and water supply
Natural Vegetation: Douglas-fir, ponderosa pine and pinegrass

DISTRIBUTION AND EXTENT:
Distribution: MLRA 43c; Central Oregon
Ecological region: Blue Mountains, John Day-Clarno Highlands
Extent: moderate

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon

SERIES PROPOSED: Crook County, Ochoco National Forest, Oregon, 2008.

REMARKS:
Diagnostic horizons and features recognized in this pedon are:
andic soil properties: 2 to 12 inches
vitrandic subgroup properties: 12 to 21 inches
mollic epipedon: 2 to 21 inches
argillic horizon: 21 to 31 inches
lithic contact: 31 inches

Lab data: NSSL pedon number: S93OR013-007

Plant Association: CPS1-12. Douglas-fir/pinegrass. (Hall, 1989, Plant Association and Management Guide for the Ochoco and Southern Blue Mountain Areas)
Plant Association Group: Douglas-fir (moist)


National Cooperative Soil Survey
U.S.A.