LOCATION BURNTRIVER OREstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Xeric Haplocambids
TYPICAL PEDON: Burntriver silt loam - on a 2 percent slope, rangeland. (Colors are for dry soil unless otherwise noted.)
A1--0 to 3 inches; light brownish gray (10YR 6/2) silt loam, dark grayish brown (10YR 4/2) moist; weak thin platy and weak fine granular structure; soft, friable, nonsticky and nonplastic; many very fine and fine roots; many very fine and fine continuous irregular pores; neutral (pH 7.2); clear smooth boundary. (3 to 6 inches thick)
A2--3 to 11 inches; light brownish gray (10YR 6/2) silt loam, dark grayish brown (10YR 4/2) moist; moderate very fine and fine subangular blocky structure; soft, friable, nonsticky and nonplastic; many very fine and fine roots; many very fine and fine continuous tubular pores; mildly alkaline (pH 7.4); clear smooth boundary. (7 to 10 inches thick)
AB--11 to 26 inches; light brownish gray (10YR 6/2) silty clay loam, dark grayish brown (10YR 4/2) moist; moderate fine and medium subangular blocky structure; slightly hard, firm, slightly sticky and slightly plastic; common very fine and fine roots; many very fine and fine continuous tubular pores; mildly alkaline (pH 7.6); gradual smooth boundary. (10 to 24 inches thick)
Bw1--26 to 39 inches; pale brown (10YR 6/3) silty clay loam, dark grayish brown (10YR 4/2) moist; strong medium angular blocky structure; slightly hard, firm, slightly sticky and slightly plastic; common very fine and fine roots; many very fine and fine continuous tubular pores; mildly alkaline (pH 7.8); gradual smooth boundary. (10 to 15 inches thick)
Bw2--39 to 51 inches; pale brown (10YR 6/3) silty clay loam, dark grayish brown (10YR 4/2) moist; moderate medium and fine angular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few fine roots; many very fine and fine continuous tubular pores; mildly alkaline (pH 7.8); gradual smooth boundary. (10 to 15 inches thick)
2Bw3--51 to 60 inches; light gray (10YR 7/2) gravelly sandy clay loam, dark grayish brown (10YR 4/2) moist; moderate medium and coarse subangular blocky structure; slightly hard, firm, slightly sticky and slightly plastic; few fine roots; many fine discontinuous tubular pores; 30 percent gravel; mildly alkaline (pH 7.8); clear wavy boundary. (5 to 12 inches thick)
2C--60 to 88 inches; very pale brown (10YR 7/3) gravelly sandy clay loam, yellowish brown (10YR 5/4) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many fine discontinuous tubular pores; 30 percent gravel; mildly alkaline (pH 7.8).
TYPE LOCATION: Baker County, Oregon; located in Denny Flat, 3,960 feet east of Higgins Reservoir in the NE1/4NE1/4SW1/4SE1/4 sec. 1, T. 13 S., R. 37 E.
RANGE IN CHARACTERISTICS: These soils are dry in all parts of the moisture control section one-half to three-fourths of the time (cumulative) that the soil temperature is above 41 degrees F. The mean annual soil temperature is 43 to 47 degrees F. Depth to the substratum (2C horizon) is 40 to greater than 60 inches. Depth to the Bw horizon is 20 to 40 inches. The particle-size control section averages 27 to 35 percent clay.
The A horizon has value of 6 or 7 dry, 4 or 5 moist, and chroma of 2 or 3 moist and dry. It has 0 to 25 percent gravel.
The Bw horizon has value of 6 or 7 dry, 4 or 5 moist, and chroma of 2 or 3 moist and dry. It is silt loam, silty clay loam or clay loam, with 20 to 40 percent clay. It has 10 to 30 percent gravel.
The 2C horizon has value of 6 or 7 dry, 5 or 6 moist, and chroma of 3 or 4 moist and dry. It is sandy clay loam or clay loam, averaging 25 to 35 percent clay and 40 to 50 percent sand. It has 20 to 30 percent gravel.
COMPETING SERIES: These are the Akercan, Lonely, and Woodpass series. Akercan soils have a solum 10 to 22 inches thick and have 18 to 25 percent clay in the particle-size control section. Lonely soils are 20 to 40 inches to bedrock. Woodpass soils have a solum 10 to 20 inches thick and have free carbonates at a depth of 7 to 12 inches.
GEOGRAPHIC SETTING: The Burntriver soils are on low stream terraces and alluvial fans. Slopes are 0 to 12 percent. Elevations range from 3,800 to 4,000 feet. The soils formed in mixed alluvium with an influence of loess and volcanic ash in the surface horizons. The mean annual precipitation is 9 to 12 inches. The mean annual temperature is 40 to 45 degrees F. The frost-free period is 60 to 90 days. This soil is on the Winkle geomorphic surface.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Marack, Damore and Silvies soils. The Marack soils are on adjacent terraces, have a mollic epipedon and calcic horizon. The Damore soils are on adjacent bottom lands, are somewhat poorly drained and are in the fine family. Silvies soils are cryic.
DRAINAGE AND PERMEABILITY: Well drained. Runoff is slow. Permeability is moderately slow.
USE AND VEGETATION: These soils are used for rangeland and hay production. The native vegetation is basin big sagebrush, Wyoming big sagebrush, basin wildrye, and Idaho fescue.
DISTRIBUTION AND EXTENT: Eastern Oregon. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Baker County Area, Oregon; 1988.
REMARKS: Diagnostic horizons and features in this pedon are:
Ochric epipedon - the zone from the surface of the soil to a depth of 26 inches (A1, A2, AB horizons).
Cambic horizon - the zone from 26 to 60 inches (Bw1, Bw2, 2Bw3 horizons).
ADDITIONAL DATA: Pedon sampled by OSU for particle-size analysis of the Bw1 and Bw2 horizons.
NSTH 17, RECLASSIFICATION ONLY, 3/95