LOCATION CLAWSON OREstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, nonacid, mesic Typic Endoaquepts
TYPICAL PEDON: Clawson sandy loam, cropland. (Colors are for moist soil unless otherwise noted.)
A--0 to 3 inches; very dark grayish brown (10YR 3/2) sandy loam, grayish brown (10YR 5/2) dry; moderate fine and very fine granular structure; soft, friable, slightly sticky and nonplastic; many very fine roots; many irregular pores; slightly acid (pH 6.4); abrupt smooth boundary. (2 to 5 inches thick)
BA--3 to 10 inches; dark grayish brown (10YR 4/2) sandy loam, light gray (10YR 7/1) dry; weak medium subangular blocky structure; slightly hard, very friable; nonsticky and nonplastic; common very fine tubular pores; common fine prominent reddish brown (5YR 4/4) masses of iron accumulation; slightly acid (pH 6.4); clear smooth boundary. (4 to 10 inches thick)
Bw--10 to 16 inches; grayish brown (2.5Y 5/2) sandy loam, light gray (2.5Y 7/2) dry; weak coarse subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; common very fine roots; many very fine tubular pores; common fine prominent reddish brown (5YR 4/4) masses of iron accumulation; few small black concretions; slightly acid (pH 6.4); abrupt wavy boundary. (4 to 10 inches thick)
C1--16 to 32 inches; light brownish gray (2.5Y 6/2) sandy loam, pale yellow (2.5Y 8/2) dry; massive; soft, very friable, nonsticky and nonplastic; common very fine tubular pores; common fine prominent strong brown (7.5YR 5/6) masses of iron accumulation; common small black concretions; neutral (pH 6.6); clear wavy boundary. (10 to 25 inches thick)
C2--32 to 46 inches; pale brown (10YR 6/3) coarse sandy loam, very pale brown (10YR 7/3) dry; massive; soft, very friable, nonsticky and nonplastic; common very fine tubular pores; common fine distinct brown (7.5YR 5/4) masses of iron accumulation; common small black concretions; neutral (pH 6.6); clear wavy boundary. (10 to 20 inches thick)
C3--46 to 60 inches; pale brown (10YR 6/3) and light brownish gray (10YR 6/2) coarse sandy loam, very pale brown (10YR 7/3) dry; massive; soft, very friable, nonsticky and nonplastic; few very fine tubular pores; common medium distinct strong brown (7.5YR 5/6) masses of iron accumulation; neutral (pH 6.6).
TYPE LOCATION: Josephine County, Oregon; about 1/2 mile south of Grants Pass, 500 feet south of Union Avenue and 200 feet west of the Williams Highway, approximately 710 feet north and 2,175 feet west of the SE corner of sec. 19, T. 36 S., R. 5 W.
RANGE IN CHARACTERISTICS: The soils are usually saturated to the surface for at least a month during most years and are usually saturated throughout the year below a depth of 40 inches. The mean annual soil temperature is 54 to 57 degrees F. Depth to bedrock is 60 inches or more. The particle-size control section averages 8 to 18 percent clay. Reaction is slightly acid or neutral.
The A horizon has hue of 10YR or 2.5Y, value of 2 through 4 moist, 5 or 6 dry, and chroma of 2 or less moist and dry.
The B horizon has hue of 10YR or 2.5Y, value of 4 or 5 moist, 6 or 7 dry, and chroma of 2 or less moist and 2 through 4 dry. It has common to many, distinct or prominent redox concentrations. It is sandy loam or coarse sandy loam with 8 to 18 percent clay. It has 0 to 5 percent gravel.
The C horizon has hue of 2.5Y or 10YR, value of 5 or 6 moist, 6 through 8 dry, and chroma of 2 through 4 moist and dry. It has common to many, faint to prominent redox concentrations. It is sandy loam or coarse sandy loam to a depth of 40 inches. Below this depth, the C horizon is stratified coarse sandy loam, loamy coarse sand, or loam. It has 0 to 5 percent gravel.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Clawson soils are on low stream terraces, alluvial fans, and drainageways. Slopes are 0 to 7 percent. Elevations range from 200 to 2,500 feet. The soils formed in alluvium weathered typically from granite and diorite with some areas having other mixed rock sources. Summers are warm and dry and winters are cool and moist. The mean annual precipitation is typically 30 to 40 inches. In the interior valleys of Curry County, Oregon, the mean annual precipitation ranges to 90 inches. The mean annual temperature is typically 52 to 54 degrees F., but ranges to 56 degrees F. in Curry County, Oregon. The frost-free period is 140 to 210 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Central Point, Jerome, Barron, Shefflein, and Tallowbox soils. Jerome soils have contrasting textures within the particle-size control section. Barron soils are somewhat excessively drained. Shefflein soils are fine-loamy. Central Point soils are well drained. Tallowbox soils are 20 to 40 inches to bedrock.
DRAINAGE AND PERMEABILITY: Poorly drained; slow runoff; moderately rapid permeability. A water table is at 1 to 3 feet from November to June.
USE AND VEGETATION: Clawson soils are used for pasture, hay, wildlife habitat, and building sites. Native vegetation dominantly is sedges, grasses and willows.
DISTRIBUTION AND EXTENT: Southwestern Oregon; MLRA 5. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Medford Area, Oregon, 1911.
REMARKS: This draft reflects a change in classification from Typic Haplaquepts to Typic Endoaquepts based on changes to Soil Taxonomy.
CEC activity class superactive added 1/2000, competing series not updated at that time.
Diagnostic horizons and features of this pedon incude:
Aquic moisture regime - saturated to the soil surface for at least a month during most years.
Chroma of 2 or less between 3 and 32 inches (BA, Bw, C1 horizons).
Color value moist of 3 from surface to 3 inches (A horizon).
Soil reaction of greater than 5.0 from 10 to 46 inches (Bw, C1, and C2 horizons).