LOCATION SINLOC WAEstablished Series
TAXONOMIC CLASS: Coarse-silty, mixed, superactive, calcareous, mesic Typic Halaquepts
TYPICAL PEDON: Sinloc silt loam, range. (Colors are for moist soil unless otherwise stated.)
A11--0 to 1/2 inch; dark grayish brown (10YR 4/2) silt loam, light brownish gray (10YR 6/2) dry; weak very fine granular structure; loose, very friable, nonsticky and slightly plastic; many roots; salt crust on horizon surface and on soil particles and peds; violently effervescent; strongly alkaline (pH 8.6); abrupt smooth boundary. (1/4 to 3/4 inches thick)
A12--1/2 to 3 inches; dark grayish brown (10YR 4/2) silt loam, light brownish gray (10YR 6/2) dry; weak fine granular structure; soft, very friable, nonsticky and slightly plastic; many roots; violently effervescent; strongly alkaline (pH 8.8); abrupt smooth boundary. (2 to 6 inches thick)
B2--3 to 15 inches; dark grayish brown (10YR 4/2) silt loam, light brownish gray (10YR 6/2) dry; weak medium subangular blocky structure; slightly hard, friable, nonsticky and slightly plastic; common roots; violently effervescent; strongly alkaline (pH 8.8); abrupt smooth boundary. (11 to 24 inches thick)
C1ca--15 to 31 inches; dark grayish brown (2.5Y 4/2) silt loam, light brownish gray (2.5Y 6/2) dry; massive but irregularly finely laminated; hard, firm, slightly sticky and slightly plastic; few roots; thread-like veins of lime, violently effervescent; strongly alkaline (pH 8.8); abrupt wavy boundary. (15 to 30 inches thick)
C2--31 to 35 inches; dark grayish brown (2.5Y 4/2) fine sandy loam, light brownish gray (2.5Y 6/2) dry; massive; soft, friable, nonsticky and nonplastic; common roots; violently effervescent; strongly alkaline (pH 8.6); abrupt wavy boundary. (0 to 5 inches thick)
C3--35 to 45 inches; dark grayish brown (2.5Y 4/2) silt loam, light brownish gray (2.5Y 6/2) dry; massive; slightly hard, friable, nonsticky and slightly plastic; few roots; strongly effervescent; moderately alkaline (pH 8.4); abrupt wavy boundary. (10 to 30 inches thick)
C4--45 to 60 inches; dark grayish brown (2.5Y 4/2) loamy fine sand, light brownish gray (2.5Y 6/2) dry; massive; soft, very friable,; few roots; intermittent lenses of silt loam; effervescent in place; moderately alkaline (pH 8.4).
TYPE LOCATION: Yakima County, Washington; 800 feet north and 170 feet west of the southeast corner section 24, T.10N., R.21E., WM.
RANGE IN CHARACTERISTICS: These soils are always moist and are saturated below 31 inches for more than 90 consecutive days in most years. They are moderately alkaline or strongly alkaline. Effervescence is about 52 degrees F. at a depth of 20 inches. Thickness of the solum is 15 to 30 inches. Hue is 10YR or 2.5Y. Sodium saturation is more than 15 percent in the upper 10 inches and decreases with increasing depth.
The A horizon has value of 3 or 4 moist and 5 or 6 dry.
The B horizon has value of 3 or 4 moist and 5 or 6 dry. It is silt loam or very fine sandy loam and has weak subangular blocky or prismatic structure.
The C horizon has value of 4 or 5 moist and chroma of 1 or 2. It is stratified silt loam, very fine sandy loam within the particle size control section but averages less than 15 percent fine sand or coarser and less than 18 percent clay. It ranges to sandy loam or loamy sand below the control section. Vertical or diagonal clastic dikes occur within the C horizon of some pedons.
COMPETING SERIES: This is the Outlook series in another family. Outlook soils have chroma of 3 at a depth of about 18 inches.
GEOGRAPHIC SETTING: Sinloc soils are on terraces at elevations of 500 to 1,200 feet. Slopes are 0 to 8 percent. These soils formed in lacustrine sediments with a loess mantle. Sinloc soils occur in an arid climate having an annual precipitation of 6 to 9 inches, with warm, dry summers and cool, moist winters. The average January temperature is 27 degrees F.; the average July temperature is 71 degrees F.; and the mean annual temperature is 50 degrees F. The frost free season is 135 to 180 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Shano and Warden soils and the competing Outlook soils. Shano and Warden soils are well drained and lack sodic properties.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; slow to medium runoff; moderate permeability.
USE AND VEGETATION: Irrigated crops, hay and pasture. Native vegetation is saltgrass, greasewood and other halophytes.
DISTRIBUTION AND EXTENT: Central and south central Washington. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Yakima County, Washington, 1979.
ADDITIONAL DATA: Lab data RT77-WAO12 (77TO58 to 77TO61) National Soil Survey Laboratory, Lincoln, Nebraska.