LOCATION KAHNEETA OREstablished Series
TAXONOMIC CLASS: Clayey-skeletal, smectitic, mesic Argic Duraquolls
TYPICAL PEDON: Kahneeta very cobbly silt loam - on a 1 percent slope at an elevation of 2700 feet, rangeland. (Colors are for moist soil unless otherwise noted.)
A--0 to 4 inches; black (10YR 2/1) very cobbly silt loam, dark gray (10YR 4/1) dry; weak fine and medium subangular blocky structure parting to weak fine granular; soft, friable, slightly sticky and slightly plastic; many very fine, fine and few medium roots; many very fine and fine irregular pores; 30 percent cobbles and 15 percent gravel; moderately acid (pH 6.0); clear smooth boundary. (4 to 6 inches thick)
BA--4 to 9 inches; very dark brown (10YR 2/2) cobbly silty clay loam, dark grayish brown (10YR 4/2) dry; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine roots; common very fine and fine tubular pores; 15 percent cobbles and 15 percent gravel; slightly acid (pH 6.2); clear smooth boundary. (0 to 5 inches thick)
Bt1--9 to 16 inches; dark brown (7.5YR 3/2) very cobbly silty clay loam, brown (7.5YR 4/2) dry; common fine distinct dark reddish brown (5YR 3/4) mottles; moderate medium and coarse subangular blocky structure; hard, firm, sticky and plastic; common very fine and fine roots; common very fine and fine tubular pores; many distinct clay films on faces of peds and lining pores; 25 percent cobbles and 20 percent gravel; neutral (pH 6.6); abrupt wavy boundary. (6 to 14 inches thick)
2Bt2--16 to 25 inches; brown (7.5YR 4/4) extremely cobbly clay, brown (7.5YR 4/4) dry; common medium distinct dark reddish brown (5YR 3/4) mottles; strong medium and coarse subangular blocky structure; very hard, very firm, very sticky and very plastic; few very fine roots; few very fine tubular pores; many prominent clay films on faces of peds and lining pores; 40 percent cobbles and 25 percent gravel; neutral (pH 7.2); abrupt smooth boundary. (7 to 15 inches thick)
2Btqm--25 to 38 inches; duripan; indurated and strongly cemented, extremely hard and very firm; 1mm silica capping; fractures within duripan have many prominent clay films; bottom of fractures have clay and silica pendants; neutral (pH 7.2); abrupt wavy boundary. (10 to 25 inches thick)
2Btq--38 to 60 inches; brown (7.5YR 4/4) extremely cobbly clay, brown (7.5YR 4/4) dry; massive; hard, firm, sticky and plastic; many prominent clay films on faces of rock fragments; 60 percent cobbles and 20 percent gravel; neutral (pH 7.0).
TYPE LOCATION: Wasco County, Oregon, about 500 feet east and 2000 feet north of the SW corner of section 23, T.8 S., R.10 E. (Latitude 44 degrees, 51 minutes, 12 seconds N, Longitude 121 degrees, 30 minutes, 36 seconds W) Warm Springs Indian Reservation.
RANGE OF CHARACTERISTICS: These soils have aquic conditions and are saturated with water from 0.5 feet to 1.5 feet from the soil surface at some period of time but has a short dry period during the summer. The mean annual soil temperature is 50 to 52 degrees F. Depth to the duripan is 20 to 30 inches. Depth to bedrock is greater than 60 inches. The mollic epipedon is 10 to 20 inches thick and may include the Bt horizon. The particle-size control section contains 30 to 50 percent clay with the weighted average being more than 35 percent. It has 10 to 40 percent cobbles and 20 to 40 percent gravel with the weighted average being more than 35 percent.
The A horizon has value of 2 or 3 moist, 4 or 5 dry and chroma of 1 or 2 moist and dry. It contains 20 to 30 percent cobbles and 15 to 30 percent gravel.
The Bt horizon has hue of 7.5YR or 10YR, value of 2 or 3 moist, 4 or 5 dry and chroma of 2 or 3 moist and dry. It is silty clay loam or clay loam and has 30 to 40 percent clay. It has 10 to 30 percent cobbles and 20 to 30 percent gravel. Redox concentrations range from few fine faint to common medium distinct in the form of soft masses. Soil reaction is slightly acid to neutral.
The 2Bt horizon has hue of 7.5YR or 10YR, value of 3 or 4 moist, 4 to 6 dry and chroma of 3 or 4 moist and dry. It is 40 to 50 percent clay and has 20 to 40 percent cobbles and 20 to 40 percent gravel. Redox concentrations range from few fine distinct to common medium distinct in the form of soft masses. Soil reaction is slightly acid to neutral.
The 2Btqm horizon is indurated with 1 to 2 mm thick laminar bands or is strongly cemented and indurated in the upper part.
The 2Btq horizon is silty clay or clay and has 40 to 50 percent clay. It has 40 to 60 percent cobbles and 10 to 20 percent gravel.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Kahneeta soils are in concave or depressional scabland areas on outwash plains. The soil formed in alluvium and glacial outwash with an influence of loess in the surface. Slopes are 0 to 3 percent. Elevations are 2600 to 3000 feet. The climate is characterized by cool and wet winters and hot and dry summers. The mean annual precipitation is 12 to 16 inches. The mean annual temperature is 48 to 50 degrees F. The frost-free period is 100 to 140 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Millcreek, Olallie, Skooker, Tenwalter and Tolius soils. Millcreek soils are on convex positions (mounds) of outwash plains, fine-loamy and well drained. Olallie soils are on flood plains, are loamy-skeletal, and poorly drained. Skooker soils are on adjacent forested outwash plains, are loamy-skeletal, well drained and lack a duripan. Tenwalter soils are on intermound scabland areas of outwash plains, well drained and shallow to a duripan. Tolius soils are on adjacent forested outwash plains, fine-loamy, well drained and lack a duripan.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained to poorly drained. Permeability is slow. A seasonally high perched water table is at a depth of 0.5 to 1.5 feet from March to June.
USE AND VEGETATION: These soils are used for livestock grazing and wildlife habitat. The native vegetation is bluegrasses, sedge, rush, and tufted hairgrass.
DISTRIBUTION AND EXTENT: North-central Oregon; MLRA 10. The soils of this series are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Wasco County (Warm Springs Indian Reservation), Oregon, 1993.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the surface of the soil to a depth of 16 inches (A, BA and Bt1 horizons).
Duripan - The zone from 25 to 37 inches (2Btqm horizon).
Argillic horizon - The zone from 9 to 25 inches (Bt1 and 2Bt2 horizons)
Particle-size control section - from 9 to 25 inches.