LOCATION HARRIMAN OR+IDEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Pachic Argixerolls
TYPICAL PEDON: Harriman loam, cropland. (Colors are for moist soil unless otherwise noted.)
Ap--0 to 5 inches; very dark brown (10YR 2/2) loam, dark gray (10YR 4/1) dry; weak medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine roots; many very fine pores; neutral (pH 6.9); abrupt smooth boundary. (4 to 10 inches thick)
A--5 to 18 inches; very dark brown (10YR 2/2) loam, dark grayish brown (10YR 4/2) dry; weak medium subangular blocky structure; hard, friable, slightly sticky and slightly plastic; common very fine roots; common very fine and few fine and medium tubular pores; weak tillage pan between 5 to 8 inches; neutral (pH 6.7); gradual wavy boundary. (5 to 15 inches thick)
Bt1--18 to 28 inches; very dark grayish brown (10YR 3/2) clay loam, dark grayish brown (10YR 4/2) dry; dark brown (10YR 3/3) crushed; weak medium and fine subangular blocky structure; hard, friable, sticky and slightly plastic; common very fine roots; many very fine and few fine tubular pores; few faint clay films on peds and in pores; neutral (pH 6.9); clear wavy boundary. (0 to 15 inches thick)
Bt2--28 to 42 inches; dark brown (10YR 3/3) clay loam, brown (10YR 5/3) dry; dark brown (10YR 4/3) crushed; weak medium prismatic structure parting to moderate medium and fine angular blocky; hard, firm, sticky and plastic; common very fine roots; many very fine and few fine tubular pores; few faint clay films on peds and in pores; neutral (pH 6.9); gradual wavy boundary. (10 to 20 inches thick)
BCt--42 to 48 inches; dark brown (10YR 3/3) sandy clay loam, pale brown (10YR 6/3) dry; dark brown (10YR 4/3) crushed; weak fine and medium subangular blocky structure; hard, friable, sticky and slightly plastic; common very fine roots; many very fine tubular pores; few faint clay films in pores; neutral (pH 7.2); abrupt wavy boundary. (0 to 12 inches thick)
2Crk--48 to 52 inches; light brownish gray (10YR 6/2) lacustrine tuff, light gray (10YR 7/2) dry; laminated; extremely firm; slightly effervescent; mildly alkaline (pH 7.5).
TYPE LOCATION: Klamath County, Oregon; about 3 miles southwest of Klamath Falls; 1,500 feet east and 2,100 feet north of the SW corner section 13, T.39S., R.8E.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 47 degrees to 53 degrees F. The soils are usually dry and are dry at depths between 4 and 12 inches for 80 to 120 days in the four-month period following the summer solstice. Depth to soft bedrock is 40 to more than 60 inches. Mineralogy is mixed and includes considerable influence from diatomaceous material. The mollic epipedon is 20 to 45 inches thick.
The A horizon has value of 2 or 3 moist, 4 or 5 dry, and chroma of 1 or 2 dry. It has about 0 to 5 percent gravel.
The Bt horizon has hue of 10YR or 7.5YR, value of 3 moist, 4 or 5 dry, and chroma of 2 or 3 moist and dry. It is clay loam with 27 to 35 percent clay and 0 to 25 percent gravel. It is neutral or mildly alkaline.
The BCt or C horizon is at depths of 40 inches or more. It has hue of 10YR or 7.5YR, value of 4 to 6 moist, 6 or 7 dry and chroma of 2 moist and dry. It has 0 to 35 percent gravel. It is clay loam or sandy clay loam. It is neutral or mildly alkaline.
COMPETING SERIES: These are the Banning, Coolbrith, Dotta, Drews, Gorman, Haysum, Robinette, Supan, Van Dusen, Waha, Wapinitia and Yaxon series. All of these soils are usually moist and lack influence from diatomaceous earth. Banning soils are dry for 45 to 90 consecutive days and are somewhat poorly drained with mottles in the A and B horizons. Coolbrith soils are moderately or slightly acid, are mottled and are saturated to within 25 to 40 inches of the surface during the spring. Dotta soils are slightly or moderately acid, and average 18 to 27 percent clay in the Bt horizon. Drews soils are slightly acid or neutral. Gorman soils have mean annual soil temperature of about 57 degrees F., 15 to 25 percent coarse and very coarse sand throughout profile and 20 to 28 percent clay in the Bt horizon. Haysum soils have a mean annual soil temperature of 52 to 59 degrees F. Robinette soils have a silt loam loess cap and the top of the argillic horizon is below 40 inches. Supan soils have a mean annual soil temperature warmer than 55 degrees F. Van Dusen soils are high in quartz, mica, and feldspar. Waha soils have a lithic contact at 20 to 40 inches. Wapinitia soils have a lithic contact at 40 to 60 inches.
GEOGRAPHIC SETTING: Harriman soils are on terraces and terrace escarpments. Elevations range from 4,100 to 4,700 feet. The soils formed in lacustrine sediments weathered from diatomite, tuff, and basalt. The climate is semiarid with hot dry summers and cool moist winters. The mean annual precipitation is 10 to 14 inches. The mean January temperature is about 28 degrees F.; the mean July temperature is about 67 degrees F.; and the mean annual temperature is about 45 to 49 degrees F. The frost-free period is 50 to 120 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Calimus, Capona, Dodes, Drewsgap, Eglirim, Lorella, and Modoc soils. Calimus soils lack an argillic horizon and average 18 to 27 percent clay in the B horizon. Capona soils have cambic horizons with 18 to 27 percent clay and have bedrock at depths of 20 to 40 inches. Dodes soils have bedrock at depths of 20 to 40 inches and have mollic epipedons 7 to 20 inches thick. Eglirim soils are clayey-skeletal and have a mollic epipedon 10 to 20 inches thick. Lorella soils have clayey-skeletal argillic horizons and are underlain by bedrock at depths of 10 to 20 inches. Drewsgap and Modoc soils have a duripan at 20 to 40 inches.
DRAINAGE AND PERMEABILITY: Well drained; moderately slow permeability.
USE AND VEGETATION: The soils are used for irrigated crops, livestock grazing, and wildlife habitat. Vegetation in rangeland is mainly mountain big sagebrush, antelope bitterbrush, basin wildrye, and bluebunch wheatgrass.
DISTRIBUTION AND EXTENT: Basins in south-central Oregon. MLRA 21. The soils are moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Klamath County, Oregon, Southern Part, 1977.
REMARKS: Diagnostic horizons and other features recognized in this pedon:
Mollic epipedon: The zone from 0 to 42 inches (Ap, A, Bt1, Bt2 horizons)
Argillic horizon: The zone from 18 to 42 inches (Bt1, Bt2 horizons)
Aridic soil moisture regime
The superactive cation exchange activity class was added in 03/2003 to the taxonomic classification by the National Soil Survey Center on request of the Reno MLRA office, without review of the soil series property data. The remainder of this document has not been updated.
ADDITIONAL DATA: Pedon S87OR-037-011, this pedon is within the range of characteristics of the series but is an inclusion in a map unit of the Eglirim series.
The superactive cation exchange activity class was added in 03/2003 to the taxonomic classification by the National Soil Survey Center on request of the Reno MLRA office, without review of the soil series property data. The remainder of this document has not been updated.