LOCATION INLOW CAEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Natrixeralfic Natridurids
TYPICAL PEDON: Inlow silt loam on a 1 percent slope under greasewood rabbitbrush and annual grasses at 4,235 feet elevation. (When described August 19, 1980, the soil was dry to 59 inches and moist below 59 inches. Colors are for dry soil unless otherwise stated).
A1--0 to 3 inches; light gray (10YR 7/1) silt loam, grayish brown (10YR 5/2) moist; weak medium platy structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine vesicular and few very fine tubular pores; moderately alkaline (pH 8.0); clear smooth boundary. (2 to 4 inches thick)
A2--3 to 8 inches; light brownish gray (10YR 6/2) silt loam, dark grayish brown (10YR 4/2) moist; moderate fine platy structure; slightly hard, friable, slightly sticky and plastic; many very fine, fine and few medium roots; many very fine interstitial and vescular and few very fine tubular pores; moderately alkaline (pH 8.0); clear wavy boundary. (4 to 6 inches thick)
A3--8 to 13 inches; light brownish gray (10YR 6/2) silt loam, dark grayish brown (10YR 4/2) moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and plastic; common very fine and fine roots; common very fine interstital and few very fine tubular pores; moderately alkaline (pH 8.0) clear wavy boundary. (4 to 6 inches thick)
Btn1--13 to 23 inches; light gray (10YR 7/2) silt loam, brown (10YR 5/3) moist; weak coarse prismatic structure parting to moderate medium subangular; hard, firm, sticky and plastic; common very fine, fine and few medium roots; few very fine interstitial and tubular pores; common moderately thick clay films on ped faces and lining pores; strongly alkaline (pH 8.6) clear wavy boundary. (5 to 12 inches thick)
Btn2--23 to 33 inches; light (10YR 7/2) loam, brown (10YR 5/3) moist; moderate medium subangular blocky structure; hard, firm, sticky and plastic; common very fine, fine and few medium roots; few very fine interstitial and tubular pores; common moderately thick clay films on ped faces and lining pores; strongly alkaline (pH 8.6) abrupt wavy boundary. (5 to 12 inches thick)
Bqk1--33 to 42 inches; very pale brown (10YR 7/3) strongly cemented duripan, brown (10YR 5/3) moist; massive, extremely hard, very firm, and brittle; common thin clay films lining pores; strongly effervescent with disseminated lime; has some coatings of silica; strongly alkaline (pH 8.6); gradual smooth boundary. (7 to 11 inches thick)
Bqk2--42 to 59 inches; very pale brown (10YR 7/3) strongly cemented duripan, brown (10YR 5/3) moist; common medium distinct yellowish brown (7.5YR 5/8) mottles; massive, very hard, very firm and brittle; common thin clay films lining pores; strongly effervescent, disseminated lime; strongly alkaline (pH 8.6); abrupt smooth boundary. (15 to 19 inches thick)
2C--59 to 69 inches; light gray (10YR 7/2) loamy fine sand, grayish brown (10YR 5/2) moist; massive; soft, very friable, nonsticky and nonplastic; few very fine roots; many very fine interstitial pores; effervescent, disseminated lime; moderately alkaline (pH 8.0).
TYPE LOCATION: Siskiyou County, California; about 3 miles southwest of Dorris, about 350 feet west of Highway 97; 1,900 feet west and 400 feet south of the northeast corner of sec. 14, T. 47 N., R. 1 W.
RANGE IN CHARACTERISTICS: Depth to the duripan and solum thickness ranges from 20 to 40 inches. The mean annual soil temperature ranges from 48 to 52 degrees F. The soil temperature at a depth of 20 inches is above 41 degrees F from about March 15 to December 1 (255 days) and is above 47 degrees F from about April 15 to November 15 (210 days). The soil between depths of 6 and 16 inches is dry in all parts from June 10 to November 15 (155 days). Moisture control section is dry more than one half the time the soil temperature is greater than 41 degrees F. Pebbles range from 0 to 5 percent of the soil, by volume. Exchangable sodium percentage is 35 to 80 percent in the textural control section.
The A horizon has dry color of 10YR 6/1, 6/2, 7/1, or 7/2 and moist color of 10YR 3/2, 3/3, 4/2 or 5/2. Reaction is mildly alkaline or moderately alkaline. It is silt loam with 10 to 15 percent clay. Electrical conductivity ranges from 0 to 2.
The Bt horizon has dry color of 10YR 5/2, 5/3, 6/1, 6/3, 7/1 or 7/2 and moist color of 10YR 3/3, 4/2, 4/3 or 5/3. Reaction is strongly alkaline or very strongly alkaline. The Bt horizon is silt loam, loam, or clay loam and averges 18 to 35 percent clay with at least 4 percent more clay content than the A horizon. Electrical conductivity ranges from 2 to 4.
The BqK horizon is very firm or extremely firm when moist. Thickness of duripan ranges from 22 to 30 inches thick.
The 2C horizon has dry color of 10YR 6/2, 6/3, 7/2 7/3 or 8/3 and moist color of 10YR 4/2, 4/3, 5/2, 5/3 or 5/4. Reaction is strongly alkaline or very strongly alkaline. Texture is fine sand, loamy fine sand or loamy sand.
COMPETING SERIES: This is the Dalzell series. The Dalzell soils have a mean annual soil temperature of 52 to 55 degrees F, 15 to 35 percent exchangable sodium, have up to 40 percent durinodes in the Btqk horizon, and a duripan that ranges in thickness from 5 to 11 inches.
GEOGRAPHIC SETTING: Inlow soils are on lake terraces. Slopes are 0 to 2 percent. The soils formed in lacustrine deposits and alluvium weathered from volcanic ash and other extrusive igneous rock sources. Elevations are 4,100 to 4,300 feet. The climate is semi-arid with warm dry summers and cool moist winters. The average annual precipitation is about 10 to 12 inches. Snowfall is 20 to 30 inches. The average annual temperature is about 46 to 50 degrees F. The average January temperature is about 30 degrees F and the average July temperature is about 65 degrees F. Frost-free season is about 30 to 50 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Doel (T), Fordney, Modoc and Poman (T). Doel soils have coarse-loamy particle-size section. Fordney soils have a sandy particle control section and lack a duripan. Modoc soils have a fine-loamy particle control section and lack carbonates. Poman soils have a sandy particle size control section.
DRAINAGE AND PERMEABILITY: Moderately well drained; slow runoff; slow permeability. A perched water table occurs at depths of 3 to 5 feet from January through March unless artificially drained.
USE AND VEGETATION: Inlow soils are used for rangeland and a few small areas are used for irrigated barley. Vegetation is greasewood, hopsage and saltgrass.
DISTRIBUTION AND EXTENT: Northcentral California. These soils are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES PROPOSED: Siskiyou County, California; Butte Valley-Tule Lake Soil Survey Area, 1985. Soils series name is coined.
REMARKS:
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: Sample for charaterization 8/80 by the Lincoln Laboratory Pedon No. S80CA-093-014.