LOCATION CRUME OREstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Typic Haploxerolls
TYPICAL PEDON: Crume loam, rangeland. (Colors are for moist soil unless otherwise noted.)
A11--0 to 4 inches; very dark grayish brown (10YR 3/2) loam, grayish brown (10YR 5/2) dry; weak very thin platy structure parting to weak very fine granular; soft, very friable, slightly sticky and slightly plastic; many very fine roots; many very fine pores; 5 percent pebbles; 20 percent pumice ash; neutral (pH 6.6); clear wavy boundary. (2 to 6 inches thick)
A12--4 to 9 inches; very dark grayish brown (10YR 3/2) loam, grayish brown (10YR 5/2) dry; weak medium subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; many very fine roots; common very fine tubular pores; 5 percent pebbles; 20 percent pumice ash; neutral (pH 6.9); gradual wavy boundary. (2 to 7 inches thick)
A3--9 to 15 inches; very dark grayish brown (10YR 3/2) loam, grayish brown (10YR 5/2) dry; weak medium subangular blocky structure; slightly hard, friable, sticky and slightly plastic; many very fine roots; common very fine tubular pores; 5 percent pebbles; 15 percent pumice ash; neutral (pH 6.9); gradual wavy boundary. (0 to 9 inches thick)
B1--15 to 19 inches; very dark grayish brown (10YR 3/2) clay loam, brown (10YR 5/3) dry; weak medium subangular blocky structure; hard, friable, sticky and plastic; common very fine roots; common very fine tubular pores; thin clay coatings on coarse sand grains; 10 percent pebbles; 15 percent pumice ash; neutral (pH 6.8); gradual wavy boundary. (0 to 8 inches thick)
B2--19 to 27 inches; dark brown (10YR 3/3) clay loam, pale brown (10YR 6/3) dry; weak medium subangular blocky structure; hard, firm, sticky and plastic; common very fine roots; common very fine tubular pores; many thin clay bridges between sand grains; 10 percent pebbles; 10 percent pumice ash; neutral (pH 6.9); gradual wavy boundary. (5 to 12 inches thick)
B3--27 to 34 inches; dark brown (10YR 3/3) clay loam, pale brown (10YR 6/3) dry; weak medium subangular blocky structure; hard, firm, sticky and plastic; common very fine roots; common very fine tubular pores; many thin clay bridges between sand grains; 10 percent pebbles; 10 percent pumice ash; neutral (pH 6.9); gradual wavy boundary. (5 to 12 inches thick)
C1--34 to 44 inches; dark brown (10YR 3/3) loam, pale brown (10YR 6/3) dry; massive; hard, friable, slightly sticky and slightly plastic; few very fine roots; few very fine tubular pores; 10 percent pebbles; neutral (pH 6.9); abrupt smooth boundary. (0 to 12 inches thick)
C2r--44 to 46 inches; diatomite thinly interbedded with lacustrine tuff.
TYPE LOCATION: Klamath County, Oregon; about 4 miles northwest of the town of Sprague River; 800 feet east and 2,650 feet south of the NW corner section 29, T.35S., R.10E.
RANGE IN CHARACTERISTICS: Mean annual soil temperatures ranges from 44 degrees to 47 degrees F. The soils are usually moist and are dry 65 to 90 days during the summer. Depth to soft bedrock or hardpan ranges from 40 to 60 inches. Hard lava pebbles average 0 to 10 percent in the 10- to 40-inch control section. The mollic epipedon is 10 to 20 inches thick.
The A horizon has value of 3 or 4 moist and 4 or 5 dry. It has 0 to 20 percent pumice cinders about 2 to 4mm in diameter, a total of 10 to 30 percent cinders and ash, and 0 to 10 percent hard lava pebbles about 2 to 5mm in diameter.
The B2 horizon has value of 3 or 4 moist, 5 or 6 dry, and chroma of 2 or 3 moist and dry. Clay films, where present, are lacking on either vertical or horizontal faces of peds, or in fine pores or the increase in the clay ratio of as much as 1.2 in the B2 horizons is not reached within the vertical distance of 12 inches. Pumice cinders and hard pebbles less than 5mm each average 0 to 10 percent of the volume. Texture is clay loam or sandy clay loam and averages 25 to 35 percent clay. This horizon is weak or moderate subangular blocky structure.
The C horizon has value of 3 or 4 moist, and chroma of 3 or 4 moist. It has 0 to 15 percent hard pebbles less than 5mm in diameter.
COMPETING SERIES: These are the Cordy, Couse, Dredge, Lobert, and Twisp series. Cordy soils formed in loess and have silt loam and loam sola. Couse soils are fine-silty and have buried A2 and B2 horizons. Dredge soils are moderately alkaline and have loam sola. Lobert soils are coarse-loamy and have mollic epipedons 20 to more than 40 inches thick. Twisp soils have loam, silt loam, and silty clay loam B2 horizons and lack appreciable amounts of ash.
GEOGRAPHIC SETTING: Crume soils are on terraces at elevations of 4,200 and 4,400 feet. Slopes are 0 to 8 percent. The soils formed in alluvium weathered from diatomite, lacustrine tuff, basalt, and pumiceous ash. The mean annual precipitation is 15 to 18 inches and it occurs mainly as snow in winter and spring. The mean annual temperature is 43 degrees to 45 degrees F. and the frost-free period is about 50 to 70 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Lobert soils and the Choptie and Yonna soils. Choptie soils have bedrock at depths of 12 to 20 inches. Yonna soils are sodic and somewhat poorly drained.
DRAINAGE AND PERMEABILITY: Well drained; slow runoff; moderately slow permeability.
USE AND VEGETATION: The soils are used for irrigated and dryland crops, range, and wildlife habitat. Vegetation in noncultivated areas is mainly big sagebrush, antelope bitterbrush, Idaho fescue, and bluebunch wheatgrass.
DISTRIBUTION AND EXTENT: Basins in south-central Oregon. The series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Klamath County, Oregon, 1977.
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.