LOCATION DAYVILLE OREstablished Series
TAXONOMIC CLASS: Fine-silty over sandy or sandy-skeletal, mixed, superactive, mesic Cumulic Endoaquolls
TYPICAL PEDON: Dayville silt loam, cultivated. (Colors are for moist soil unless otherwise noted.)
Ap--0 to 5 inches; very dark brown (10YR 2/2) silt loam, grayish brown (10YR 5/2) dry; weak thin and medium platy and moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine roots; few fine continuous tubular pores; slightly effervescent; moderately alkaline (pH 8.0); clear smooth boundary. (4 to 6 inches thick)
A--5 to 11 inches; very dark grayish brown (10YR 3/2) silt loam, grayish brown (10YR 5/2) dry; moderate fine and medium blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine roots; few medium, few coarse, and many very fine tubular pores; slightly effervescent; moderately alkaline (pH 8.0); clear smooth boundary. (4 to 10 inches thick)
AC--11 to 18 inches; very dark grayish brown (10YR 3/2) silt loam, grayish brown (10YR 5/2) dry; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine roots; few fine tubular pores; flecks of lime, matrix not calcareous; moderately alkaline (pH 8.0); gradual smooth boundary. (5 to 10 inches thick)
C1--18 to 27 inches; very dark grayish brown (10YR 3/2) silt loam, grayish brown (10YR 5/2) dry; massive; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots; common fine and very fine tubular pores; moderately alkaline (pH 8.0); gradual smooth boundary. (0 to 10 inches thick)
C2--27 to 33 inches; very dark grayish brown (10YR 3/2) silt loam, grayish brown (10YR 5/2) dry; massive; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots; few very fine and fine tubular pores; common fine distinct (7.5YR 4/4) redox concentrations; moderately alkaline (pH 8.0); clear smooth boundary. (4 to 7 inches thick)
C3--33 to 36 inches; very dark grayish brown (10YR 3/2) silt loam, grayish brown (10YR 5/2) dry; massive; slightly hard, friable, slightly sticky and slightly plastic; few very fine pores; many medium distinct (7.5YR 4/4) redox concentrations; moderately alkaline (pH 8.0); abrupt smooth boundary. (2 to 6 inches thick)
2C4--36 to 60 inches; stratified sand and very gravelly sand; single grain; loose, nonsticky and nonplastic..
TYPE LOCATION: Grant County, Oregon; about 5 miles east of Dayville; 500 feet due south (magnetic) of power pole which is 150 feet west of milepost 136 on Highway 26; 2,200 feet east and 1,700 feet south of the NW corner of section 11, T.13S., R.27E. Latitude 44 degrees, 27 minutes, 27 seconds North; Longitude 119 degrees, 26 minutes, 24 seconds West.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 47 to 54 degrees F. and the mean summer soil temperature is 65 to 72 degrees F. The soil is saturated with water at some period of the year. Depth to distinct or prominent redox concentrations is 24 inches or more. The soil is calcareous in the A horizon and the upper part of the AC horizon but is noncalcareous in some part between depths of 10 and 20 inches. Depth to contrasting textured material ranges from 15 to 36 inches. The upper part of the particle-size control section is silt loam or silty clay loam and has thin layers of loam or sandy loam in some pedons. It averages 18 to 30 percent clay and less than 15 percent coarser than very fine sand. The lower part is loamy sand or sand with 0 to 5 percent clay and over 35 percent rock fragments.
The A horizon has value of 2 or 3 moist, 4 or 5 dry, and chroma of 1 or 2 moist and dry.
The AC and C horizons have value of 2 or 3 moist and 4 or 5 dry.
COMPETING SERIES: This is the Boyce series. Boyce soils are poorly drained and have distinct redox concentrations at 6 to 24 inches.
GEOGRAPHIC SETTING: The Dayville soils are on level or gently sloping alluvial flood plains or low alluvial fans. Slopes are 0 to 2 percent. Elevation is 2,200 to about 4,000 feet. The soils formed in stratified recent alluvium of mixed origin. The climate is semiarid with hot dry summers and cold moist winters. The mean annual precipitation is 12 to 16 inches. The mean annual temperature is 48 to 51 degrees F. and the mean summer temperature is 63 to 70 degrees F. The frost-free period is 80 to 150 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Powder soils and the competing Boyce soils. Powder soils are well drained and are coarse-silty to depths of 40 inches or more.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; slow runoff; moderate over rapid permeability. The soils is occasionally flooded and has a water table at 2.0 to 3.0 feet from March to July.
USE AND VEGETATION: Mostly for hay and pasture. The natural vegetation is sedges, rushes, Kentucky bluegrass and willows.
DISTRIBUTION AND EXTENT: Valleys of east-central Oregon. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Grant County, Oregon, 1975.
REMARKS: Diagnostic horizons and other features:
Mollic epipedon - 0 to 36 inches