LOCATION EASTABLE CAEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Xeric Haplocambids
TYPICAL PEDON: Eastable loam - on a alluvial fan of about 1 percent slope under bluebunch wheatgrass, Idaho fescue and big sagebrush at 4,160 feet elevation. (When described on November 7, 1979, the soil was moist to 6 inches and dry below. Colors are for dry soil unless otherwise stated).
A--0 to 4 inches; light brownish gray (10YR 6/2) loam, very dark grayish brown (10YR 3/2) moist; weak fine subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; many very fine, common fine, and few medium roots; many very fine interstitial pores; neutral (pH 7.0); clear smooth boundary. (3 to 6 inches thick)
Bt--4 to 18 inches; light brownish gray (10YR 6/2) clay loam, very dark grayish brown (10YR 3/2) moist; moderate medium subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; common very fine, common fine and medium roots; common very fine interstitial and common very fine and fine tubular pores; few thin clay films in pores; neutral (pH 7.2); clear wavy boundary. (11 to 18 inches thick)
C1--18 to 35 inches; pale brown (10YR 6/3) loam, dark brown (10YR 4/3) moist; massive; hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; few very fine tubular pores; mildly alkaline (pH 7.6); clear wavy boundary. (15 to 40 inches thick)
C2--35 to 60 inches; very pale brown (10YR 7/3) loam, dark brown (10YR 4/3) moist; massive; hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; few very fine tubular pores; moderately alkaline (pH 8.0). (10 to 25 inches thick)
TYPE LOCATION: Siskiyou County, California; about 1 mile south of Lairds Landing on the south end of the Lower Klamath National Wildlife Refuge; 270 feet N.E. of dirt road along east side of the little table lands; 1,820 feet south and 1,550 feet east of the northwest corner of section 2, T.46 N., R.2 E.
RANGE IN CHARACTERISTICS: Depth to bedrock is greater than 60 inches. The mean annual soil temperature is 48 to 52 degrees F. The soil temperature is about 41 degrees F from about March 15 to about December 1 and is above 47 degrees F from about April 15 to about November 15. The soil between depths of 7 to 17 inches is dry in all parts from June 15 until November 10 and is not moist in some part for as long as 90 consecutive days. Solum thickness ranges from 14 to 24 inches. The organic matter content is 2 to 3 percent in the surface and decreases regularly with depth. Pebbles range from 0 to 10 percent. Reaction is neutral to moderately alkaline.
The A horizon has moist color of 10YR 3/2 or 2/1. Clay content is 18 to 25 percent.
The Bt horizon has dry color of 5/2, 6/2 or 6/3 and moist color of 10YR 3/2 or 3/3. It is loam or clay loam with 18 to 30 percent clay and averages 1 to 3 percent (absolute) more clay content than the A horizon.
The C horizon has dry color of 10YR 7/3, 6/2, 6/3 or 7/4 or 8/2 and moist color of 10YR 3/3, 4/3, 4/4, 5/4, or 6/2.
COMPETING SERIES: These are the Agency, Ferdelford, Legler, North Powder, Pocan, Potratz, and Redmond. Agency, Ferdelford, North Powder, Potratz, and Redmond soils have lithic or paralithic contacts within a depth of 40 inches. Pocan soils have a lithic contact at 40 to 60 inches and have Cca horizons. Legler soils have ca horizons, free carbonates at 15 to 20 inches and a solum more than 40 inches thick.
GEOGRAPHIC SETTING: The Eastable soils occur on concave alluvial fans from lacustrine tuff and extrusive igneous rock. Slopes are 0 to 15 percent. Elevations are 4,100 to 4,800 feet. The climate is semiarid with warm dry summers and cool moist winters. The average annual precipitation is 10 to 14 inches. The mean annual temperature is about 48 degrees F. Frost-free season is about 50 to 80 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Hedox (T), Porterfield (T) and Capona. The Hedox soils are 20 to 40 inches to bedrock, and are on convex upper slopes. The Porterfield soils are 10 to 20 inches deep to bedrock and are on convex upper slopes. The Capona soils are 20 to 40 inches deep to bedrock, and occur on hills.
DRAINAGE AND PERMEABILITY: Well drained, runoff is slow or medium, permeability is moderately slow.
USE AND VEGETATION: This soil is used for rangeland with small areas used for cropland and irrigated hay and pasture. Native vegetation is big sagebrush, Idaho fescue, bluebunch wheatgrass, and basin wildrye.
DISTRIBUTION AND EXTENT: North Central California. Soils are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Siskiyou County, California, Butte-Valley-Tule Lake Area, 1980. Series name is coined.
REMARKS: Series reclassified on September, 1994. Competing series not reviewed at that time.
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.