LOCATION HALL RANCH OREstablished Series
TAXONOMIC CLASS: Fine-loamy, isotic, frigid Vitrandic Haploxerolls
TYPICAL PEDON: Hall Ranch stony loam, forested. (Colors are for moist soil unless otherwise noted.)
Oi--1 inch to 0; loose litter of needles, twigs and leaves.
A1--0 to 2 inches; very dark brown (10YR 2/2) stony loam, grayish brown (10YR 5/2) dry; weak very fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many fine fibrous roots; few stones on surface; many irregular pores; neutral (pH 6.6); clear smooth boundary. (1 to 4 inches thick)
A2--2 to 8 inches; very dark brown (10YR 2/2) gravelly loam, grayish brown (10YR 5/2) dry; weak very fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine medium roots; many irregular pores; 20 percent gravel; neutral (pH 6.6); gradual smooth boundary. (5 to 10 inches thick)
Bw1--8 to 17 inches; very dark grayish brown (10YR 3/2) gravelly loam, brown (10YR 5/3) dry; weak fine subangular blocky structure; slightly hard, slightly sticky and slightly plastic; many fine to coarse roots; many very fine and few fine tubular pores; 25 percent gravel; neutral (pH 6.6); gradual smooth boundary. (6 to 10 inches thick)
Bw2--17 to 31 inches; dark grayish brown (2.5Y 4/2) gravelly loam, brown (10YR 5/3) dry; weak fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many fine to coarse roots; many very fine and few fine tubular pores; about 20 percent gravel; few small soft areas filled with darker soil from horizons above; neutral (pH 6.7); clear smooth boundary. (0 to 6 inches thick)
C--31 to 35 inches; grayish brown (2.5Y 5/2) very cobbly loam, light gray (2.5Y 7/2) dry; massive; slightly hard, friable, slightly sticky and slightly plastic; many fine to coarse roots; many very fine pores; about 80 percent weathered andesite rock fragments; neutral (pH 6.6); clear smooth boundary. (0 to 6 inches thick)
2Cr--35 inches; platy soft andesite.
TYPE LOCATION: Union County, Oregon; 2,200 feet north of State Highway 203 along road north of Catherine Creek State Park along the west fork of the logging road; 180 feet east of road; 560 feet south of gate and near center sec. 6, T. 5 S., R. 41 E.
RANGE IN CHARACTERISTICS: The soils are usually moist but are dry for 60 to 80 consecutive days between depths of 4 and 12 inches. The mean annual soil temperature ranges from 42 to 47 degrees F, and the mean summer soil temperature at a depth of 20 inches is 60 degrees F or more. The depth to soft andesitic or rhyolitic bedrock (paralithic contact) is 20 to 40 inches. Rock fragments in the control section range from 5 to 35 percent. The base saturation of the upper 30 inches ranges from 60 to 75 percent.
The A horizon has hue of 10YR, 7.5YR, or 5YR, value of 3 thru 5 dry, 2 or 3 moist and chroma of 2 or 3 moist and dry. It is loam, gravelly loam, gravelly silt loam or stony loam.
The Bw horizon has hue of 10YR, 7.5YR, 5YR, or 2.5Y, value of 4 through 6 dry and 3 or 4 moist, and chroma of 2 through 4. It is gravelly loam, gravelly silt loam, stony loam, stony silt loam or gravelly clay loam. It has 18 to 35 percent clay.
The C horizon has hue of 2.5Y, 10YR, or 7.5YR, value of 4 or 5 moist, 6 or 7 dry, and chroma of 2 or 3 moist and dry. It has 35 to 80 percent rock fragments 1 to 6 inches in diameter.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: The Hall Ranch soils are on mountainous areas at elevations of 3,000 to 5,400 feet. Slope gradients range from 2 to 65 percent. The soils formed in medium textured mixed material from loess, ash and colluvium weathered from rhyolite and andesite. The mean annual precipitation is 18 to 30 inches. The mean annual temperature is 40 to 45 degrees F. The frost-free period is 50 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Anatone, Boardtree, Hankins, Klicker, Labuck and Tolo soils. Anatone soils are less than 20 inches deep to bedrock. Boardtree and Tolo soils are ashy over clayey and ashy over loamy respectively. Hankins soils have fine textured argillic horizons. Klicker soils are loamy-skeletal. Labuck soils are loamy-skeletal and formed in weathered granodiorite.
DRAINAGE AND PERMEABILITY: Well drained; slow to rapid runoff; moderately slow permeability.
USE AND VEGETATION: Timber production and rangeland. Native vegetation is ponderosa pine and Douglas fir with an understory of pinegrass and elk sedge.
DISTRIBUTION AND EXTENT: Blue Mountains of northeastern Oregon. Series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Morrow County, Oregon; 1977.
ADDITIONAL DATA: Characterization data for two pedons (S60-OR-31-6 and S60-OR-31-7) by SCS Riverside Laboratory.