LOCATION SPRAGUERIVER ORTentative Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive Aquandic Cryaquolls
TYPICAL PEDON: Spragueriver mucky ashy loam - herbaceous community, rangeland, on a 1 percent slope at 4390 feet elevation. (Colors are for moist soil unless otherwise noted.)
Oi--0 to 1 inch; slightly decomposed plant material; herbaceous litter dominated by grassy material; abrupt smooth boundary. (0 to 1 inch thick)
Oe--1 to 2 inches; moderately decomposed plant material; root mat dominated by grassy material; abrupt smooth boundary. (0 to 3 inches thick)
A1--2 to 13 inches; black (10YR 2/1) mucky ashy loam, very dark gray (10YR 3/1) dry; moderate very coarse subangular blocky structure; hard, firm, moderately sticky, moderately plastic; many very fine and fine, and common medium roots; many fine irregular pores; slightly acid (pH 6.2); gradual smooth boundary. (6 to 18 inches thick)
A2--13 to 25 inches; black (10YR 2/1) ashy silt loam, very dark gray (10YR 3/1) dry; moderate coarse subangular blocky structure; hard, firm, moderately sticky, moderately plastic; common fine, many medium and few coarse roots; few fine tubular and common very fine irregular pores; slightly acid (pH 6.4); gradual smooth boundary. (8 to 30 inches thick)
AB--25 to 42 inches; very dark gray (10YR 3/1) ashy clay loam, gray (10YR 5/1) dry; moderate medium subangular blocky structure parting to moderate medium granular; hard, firm, slightly sticky, moderately plastic; common fine and few medium roots; many very fine interstitial pores; slightly acid (pH 6.4); clear smooth boundary. (0 to 24 inches thick)
Bg--42 to 48 inches; 70 percent dark grayish brown (10YR 4/2) and 30 percent greenish black (10Y 2.5/1) paragravelly ashy loam, light brownish gray (10YR 6/2) dry; massive; hard, firm, moderately sticky, moderately plastic; 10 percent indurated volcanic rock gravel and 10 percent moderately cemented sandstone paragravel; neutral (pH 6.6); (5 to 15 inches thick)
2BCc--48 to 63 inches; brown (10YR 4/3) extremely gravelly sandy loam, brown (10YR 5/3 ) dry; single grained; loose, nonsticky and nonplastic; few very fine and fine roots; many fine interstitial pores; 40 percent gravel size indurated volcanic rock and 5 percent cobble size indurated volcanic rock; 30 percent strongly cemented 2 to 20 millimeter iron-manganese nodules; slightly acid (pH 6.4).
TYPE LOCATION: Klamath County, Oregon; 4 miles south and 6 miles east of Sprague River; 2100 feet east and 1300 feet north of the southwest corner of section 35, T. 36 S., R. 11E., Sprague River East, Oregon USGS quadrangle. UTM: 633326 meters E; 4695600 meters N; Zone 10 N. NAD27 CONUS datum. Latitude: 42 degrees 24 minutes 15.00 seconds north, Longitude: 121 degrees 22 minutes 48.00 seconds west.
RANGE IN CHARACTERISTICS:
Soil Temperature: cryic regime
Mean annual soil temperature - 35 to 39 degrees F
Mean summer soil temperature - 39 to 43 degrees F
Mean winter soil temperature - 32 to 35 degrees
Soil Moisture: aquic and xeric regime. Moisture control section - 4 to 12 inches, saturated in all parts for 30 to 60 days in April and May, dry in all parts for 60 to 90 days in August, September and October
Particle-size control section: from 10 to 40 inches below the mineral soil surface
Clay content, average: 20 to 30 percent
Rock fragment content, average: 0 to 10 percent
Diagnostic horizons and features:
Aquandic subgroup properties: from the mineral soil surface, 40 to 60 inches thick
Ammonium oxalate extractable Al plus 1/2 Fe: 0.2 to 0.4 percent
Coarse silt and sand content: 30 to 50 percent of fine earth fraction
Volcanic glass content: 5 to 30 percent
Mollic epipedon: 40 to 60 inches thick
Gleyed horizon, depth below mineral soil surface: 40 to 60 inches
Lithologic discontinuity, depth below mineral soil surface: 40 to 80 inches
A horizon
Hue: 7.5YR or 10YR moist or dry
Chroma: 1 moist, 1 or 2 dry
Clay content: 8 to 18 percent
Rock fragment content: 0 to 7 percent
Gravel content: 0 to 5 percent
Cobble content: 0 to 2 percent
Reaction: moderately acid to neutral (pH 5.6 to 7.3)
A2 horizon
Hue: 7.5YR or 10YR moist or dry
Chroma: 1 moist, 1 or 2 dry
Texture: ashy loam, ashy silt loam, ashy clay loam
Clay content: 20 to 30 percent
Rock fragment content: 0 to 7 percent
Gravel content: 0 to 5 percent
Cobble content: 0 to 2 percent
Reaction: moderately acid to neutral (pH 5.6 to 7.3)
AB horizon
Depth to: 20 to 50 inches
Hue: 7.5YR or 10YR moist, 7.5YR, 10YR or 2.5Y dry
Value: 2 or 3 moist, 3 to 5 dry
Chroma: 1 or 2 moist or dry
Texture: ashy loam, ashy silt loam, ashy clay loam
Clay content: 18 to 27 percent
Rock fragment content: 0 to 7 percent
Gravel content: 0 to 5 percent
Cobble content: 0 to 2 percent
Reaction: moderately acid to neutral (pH 5.6 to 7.3)
Bg horizon
Depth to: 40 to 60 inches
Hue: 7.5YR, 10YR, 2.5Y, 5Y, 10Y or 5G moist, 10YR, 2.5Y or 5Y dry
Value: 2 to 5 moist, 5 to 7 dry
Chroma: 1 or 2 moist, 2 or 3 dry
Texture: ashy loam, paragravelly ashy loam, ashy silt loam, paragravelly silt loam, ashy clay loam, paragravelly ashy clay loam
Clay content: 18 to 27 percent
Paragravel content: 5 to 20 percent
Rock fragment content: 5 to 15 percent
Gravel content: 5 to 15 percent
Cobble content: 0 to 2 percent
Reaction: slightly acid or neutral (pH 6.1 to 7.3)
2BCc horizon (where present)
Depth to: 40 to over 80 inches
Hue: 7.5YR or 10YR moist and dry
Value: 3 or 4 moist, 3 to 6 dry
Chroma: 2 to 4 moist or dry
Texture: very gravelly sandy loam, extremely gravelly sandy loam, very cobbly sandy loam, extremely cobbly sandy loam, very gravelly loamy coarse sand, extremely gravelly loamy coarse sand, very cobbly loamy coarse sand or extremely cobbly loamy coarse sand
Rock fragment content (including strongly cemented to indurated gravel size iron-manganese nodules): 35 to 80 percent
Gravel content: 30 to 70 percent
Cobble content: 5 to 50 percent
Volcanic glass content: 0 to 5 percent
Reaction: slightly acid to neutral (6.1 to 7.3)
COMPETING SERIES:
Gerow (tentative OR) - aquandic subgroup properties are 15 to 30 inches thick
Lavaspring (CA) - are stratified in the particle-size control section and average 15 to 35 percent rock fragments in the particle-size control section
GEOGRAPHIC SETTING:
Landscape - lava plateaus or valleys
Landform - drainageways or flood plains
Elevation - 4200 to 5610 feet
Slope - 0 to 6 percent
Parent material - alluvium
Climate - cold moist winters and cool dry summers
Mean annual air temperature - 40 to 45 degrees F
Mean annual precipitation - 16 to 30 inches
Frost-free period - 30 to 60 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Bigtop,
Bly,
Maset and
Royst soils.
Bigtop soils have 35 to 50 percent clay in the particle-size control section and are 20 to 40 inches deep to duripan.
Bly soils are well drained and have an argillic horizon.
Maset soils are well drained, have andic soil properties in the upper portion of the particle-size control section and are 20 to 40 inches deep to bedrock.
Royst soils are well drained, have greater than 35 percent rock fragments in the particle-size control section and are 20 to 40 inches deep to bedrock.
DRAINAGE AND PERMEABILITY:
Drainage - poorly
Permeability - moderate
Watertable - a seasonal water table is at its uppermost limit in April or May, and present April to August
Flooding - occurs in some areas during April or May
USE AND VEGETATION: Spragueriver soils are used for livestock grazing, wildlife habitat, watershed and recreation. The soil supports both herbaceous dominated and forested plant communities. The potential natural plant communities are the dry meadow plant series and the ponderosa pine/common snowberry flood plain plant association. Common species in the herbaceous communities include Cusick's bluegrass, Kentucky bluegrass, Baltic ruxh, bulbous bluegrass, fewflower spikerush, meadow death camas and poverty rush. The forested communities consist of an overstory of ponderosa pine and quaking aspen and an understory of common snowberry, Saskatoon serviceberry or rose spirea.
DISTRIBUTION AND EXTENT: Klamath County, Oregon; MLRA 21. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Klamath County, Northern Part, Oregon, 2008
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - 2 to 42 inches (A1, A2 and AB horizons)
Aquic conditions with endosaturation - 2 to 48 inches (A1, A2, AB and Bg horizons)
Aquandic subgroup properties 2 to 48 inches
Particle-size control section - 12 to 42 inches
ADDITIONAL DATA:
NASIS SITE ID - 05-JFD-07; NASIS PEDON ID - 05OR683007