LOCATION CHILOQUIN OREstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Oxyaquic Vitrandic Haploxerepts
TYPICAL PEDON: Chiloquin ashy loam, pasture, on a south facing slope of 1 percent at 4,278 feet elevation. When described on May 21, 2003, the soil was moist to 43 inches and saturated below that depth. (Colors are for dry soil unless otherwise noted. All textures are apparent field textures)
Ap--0 to 5 inches; gray (10YR 6/1) ashy loam, very dark grayish brown (10YR 3/2) moist; moderate fine granular structure; slightly hard, friable, nonsticky, slightly plastic; common fine and many very fine roots; many fine tubular and many very fine irregular pores; 1 percent pumice paragravel; very slightly effervescent; slightly alkaline (pH 7.4); abrupt smooth boundary. (4 to 10 inches thick)
AB--5 to 18 inches; gray (10YR 6/1) ashy loam, very dark grayish brown (10YR 3/2) moist; weak thin platy structure; slightly hard, friable, slightly sticky, slightly plastic; many fine and common very fine roots; many fine tubular and many very fine irregular pores; 2 percent pumice paragravel; slightly effervescent; slightly alkaline (pH 7.4); gradual wavy boundary. (0 to 15 inches thick)
w1--18 to 35 inches; light gray (10YR 7/2) ashy loam, dark grayish brown (10YR 4/2) moist; weak fine and medium subangular blocky structure; hard, friable, slightly sticky, slightly plastic; common very fine roots; common fine tubular and many very fine irregular pores; 2 percent andesite fine gravel and 1 percent pumice paragravel; slightly effervescent; slightly alkaline (pH 7.8); clear wavy boundary. (7 to 15 inches thick)
Bw2--35 to 43 inches; light brownish gray (10YR 6/2) ashy loam, brown (10YR 4/3) moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; common very fine roots; few fine tubular and many very fine irregular pores; 2 percent fine faint spherical dark gray (10YR 4/1) moist, iron depletions throughout and 10 percent fine distinct irregular yellowish brown (10YR 5/6) moist, iron-manganese masses throughout; 1 percent andesite fine gravel and 2 percent pumice paragravel; slightly effervescent; slightly alkaline (pH 7.8); clear wavy boundary. (0 to 10 inches thick)
C1--43 to 55 inches; very pale brown (10YR 7/3) ashy very fine sandy loam, brown (10YR 4/3) moist; massive; hard, friable, slightly sticky, slightly plastic; many very fine roots; few fine tubular and many very fine irregular pores; 2 percent fine faint spherical dark gray (10YR 4/1) moist, iron depletions throughout and 5 percent fine distinct irregular yellowish brown (10YR 5/4) moist, iron-manganese masses throughout; noneffervescent; slightly alkaline (pH 7.4); gradual wavy boundary. (10 to 20 inches thick)
C2--55 to 72 inches; very pale brown (10YR 7/3) ashy very fine sandy loam, brown (10YR 4/3) moist; massive; hard, friable, nonsticky, slightly plastic; many very fine irregular pores; 5 percent fine distinct irregular yellowish brown (10YR 5/4) moist, iron-manganese masses throughout; noneffervescent; slightly alkaline (pH 7.4).
TYPE LOCATION: Klamath County, Oregon; about 4 miles west of the town of Sprague River; about 1950 feet south and 30 feet west of the northeast corner of section 6, T 36 S, R 10 E. (Latitude - 42 degrees, 28 minutes, 52.23 seconds N., Longitude - 121 degrees, 33 minutes, 55.05 seconds W.) Sprague River West, Oregon USGS quadrangle; UTM 617921 meters E, 4704200 meters N, zone 10 NAD83
RANGE IN CHARACTERISTICS:
Average annual soil temperature 44 to 47 degrees F.
Moisture control section 4 to 12 inches dry for 60 to 90 days within the four month period following the summer solstice.
Depth to apparent high water table 35 to 43 inches for 90 to 120 days in spring and summer
Estimated properties:
Volcanic glass content 5 to 20 percent
Acid oxalate Al+1/2Fe+1/2 Fe 0.4 to 1.0 percent
Moist bulk density 1.0 to 1.2 g/cc
15 bar water retention 10 to 15 percent on air dried samples
Ap horizon
Value 2 or 3 moist and 6 dry
Chroma 1 or 2, dry and moist
Clay content 12 to 15 percent
Paragravel content 0 to 2 percent pumice
Pumiceous sand content 2 to 30 percent, 1 to 2 mm diameter
Reaction neutral to slightly alkaline
AB horizon
Value 2 or 3 moist and 6 dry
Chroma 1 or 2, dry and moist
Texture ashy loam or ashy sandy loam
Clay content 15 to 20 percent
Paragravel content 0 to 2 percent pumice
Pumiceous sand content 2 to 30 percent, 1 to 2 mm diameter
Reaction neutral to moderately alkaline
Bw horizon
Value 3 or 4 moist and 6 or 7 dry
Chroma 2 through 4 dry, and 2 to 3 moist
Texture ashy loam or ashy sandy clay loam
Clay content 18 to 27 percent
Paragravel content 0 to 2 percent pumice
Gravel content 0 to 2 percent andesite
Pumiceous sand content 2 to 30 percent, 1 to 2 mm
Redoximorphic features
2 to 5 percent faint to distinct iron depletions
2 to 10 percent distinct iron manganese masses
Reaction neutral to slightly alkaline
C horizon
Value 3 or 4 moist and 6 or 7 dry
Chroma 2 through 4 moist and 1 through 3 dry
Texture ashy fine sandy loam, ashy very fine sandy loam, or ashy loam
Clay content 10 to 15 percent
Redoximorphic features
2 to 10 percent faint to distinct iron depletions
5 to 20 percent distinct iron manganese masses
Reaction neutral to slightly alkaline
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Chiloquin soils are on narrow flood plains and stream terraces at elevations of 4,175 to 4,300 feet. The soils formed in alluvium derived from diatomite, volcanic rock and tephra. The climate is cool subhumid. The average annual precipitation ranges from 15 to 18 inches. The average annual temperature ranges from 43 to 45 degrees F. The frost-free period is 50 to 70 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Wolfbutte, Klamath, Dilman and Lobert soils. Wolfbutte soils are on terraces. They are well drained, have argillic horizons, and weakly cemented duripans at 20 to 40 inches. Klamath soils are in depressions on floodplains. They have less than 15 percent fine sand and coarser, and are very poorly drained. Dilman soils are on floodplains. They are poorly drained, and have ashy loamy coarse sand textures at a depth of 15 inches. Lobert soils are on terraces. They are well drained.
DRAINAGE AND PERMEABILITY: Moderately well drained; moderate permeability.
USE AND VEGETATION: These soils are used for irrigated and dryland hay and pasture, and wildlife habitat. The soils commonly support silver sagebrush, green rabbitbrush and bluegrass.
DISTRIBUTION AND EXTENT: Basins in south-central Oregon, MLRA 21. The series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Klamath County, Oregon, 1977.
REMARKS:
Diagnostic horizons and features in this pedon include:
Ochric epipedon
Cambic horizon the zone from 18 to 43 inches (Bw1 and Bw2 horizons)
Particle-size control section the zone from 10 to 40 inches (part of the AB, the Bw1 and part of the Bw2 horizons)
ADDITIONAL DATA:
NASIS Site ID: 03-SMM-011
NASIS Pedon ID: 03OR681011
Ecological Site: Dry Meadow 14 - 30 PZ (R021XY315OR)
The type location was reviewed and re-described in 2003 and the series was reclassified based on lab data collected on similar soils in the area.