LOCATION BASHAW OR
Established Series
Rev. AON/JGM/EED
12/2017
BASHAW SERIES
Landscape--valleys
Landform--flood plains, depressions, and drainageways of terraces and fans
Slope--0 to 12 percent
Parent material--clayey alluvium
Mean annual precipitation--about 1150 mm
Mean annual air temperature--about 11 degrees C
Depth class--very deep
Drainage class--poorly drained
Soil moisture regime--aquic
Soil temperature regime--mesic
Soil moisture subclass--xeric
TAXONOMIC CLASS: Very-fine, smectitic, mesic Xeric Endoaquerts
TYPICAL PEDON: Bashaw clay in an area of pasture
A--0 to 8 cm; clay, dark gray (10YR 4/1) dry, very dark gray (10YR 3/1) moist; moderate medium and fine subangular blocky structure; very hard, firm, very sticky and very plastic; common very fine roots; many very fine pores; many fine distinct yellowish red (5YR 4/6) masses of iron accumulation; moderately acid (pH 5.8); abrupt smooth boundary
Bssg1--8 to 36 cm; clay, very dark gray (N 3/0) dry, black (N 2/0) moist; appears massive when wet, but weak coarse prismatic structure and weak coarse angular blocky when moist or dry; very firm, very hard, very sticky and very plastic; common very fine roots; many very fine pores; few fine distinct yellowish red (5YR 5/6) masses of iron accumulation; common fine dark yellowish brown (10YR 4/6) and black (10YR 2/1) concretions; few slickensides; moderately acid (pH 6.0); clear smooth boundary
Bssg2--36 to 79 cm; clay, very dark gray (N 3/0) dry, black (N 2/0) moist; massive; very hard, very firm, very sticky and very plastic; few very fine roots; few very fine pores; few fine prominent yellowish red (5YR 4/6) masses of iron accumulation; common fine dark yellowish brown (10YR 4/6) and black (10YR 2/1) concretions; few slickensides; neutral (pH 6.6); gradual smooth boundary
Bssg3--79 to 122 cm; clay, dark gray (N 4/0) dry, very dark gray (N 3/0) moist; massive; very hard, very firm, very sticky and very plastic; common fine gray weathered coarse fragments; few roots; few very fine pores; common medium distinct light olive brown (2.5Y 5/6) masses of iron accumulation; common intersecting slickensides; neutral (pH 7.0); abrupt smooth boundary
Cg--122 to 152 cm; clay, light brownish gray (2.5Y 6/2) dry, dark grayish brown (2.5Y 4/2) moist; massive; very hard, firm, moderately sticky and moderately plastic; common very fine pores; many medium distinct dark brown (7.5YR 3/2) and dark reddish brown (5YR 3/2) masses of iron accumulation and few medium faint dark gray (N 4/0) iron depletions; neutral (pH 7.0)
TYPE LOCATION: Marion County, Oregon, about 1.5 km west of Mount Angel; about 605 m east and 505 m south of the northwest corner of section 9, T. 6 S., R. 1 W.; latitude 45.0667698, longitude -122.8180202, datum WGS 84 (coordinates estimated from PLSS details)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--11 to 13 degrees C
Moisture control section--usually moist, but saturated more than 30 consecutive days each year
The soils crack and open and close once each year; they remain open 60 consecutive days or more in most years.
The slickensides are close enough to intersect in all or part of the profile between depths of 25 and 100 cm.
Particle-size control section
*Clay content--60 to 70 percent (weighted average)
*Total fragment content--0 to 5 percent
A horizon
Hue--10YR, 2.5Y, 5Y, neutral
Value--2 or 3 moist, 3 or 4 dry
Chroma--1, 0
Fine-earth texture--clay, silty clay, silty clay loam
Clay content--35 to 70 percent
Sand content--1 to 15 percent
Total fragment content--0 to 5 percent
Reaction--5.1 to 6.0
Thickness--8 to 38 cm
Bssg horizon
Hue--10YR, 2.5Y, 5Y, neutral
Value--2 moist and 3 or 4 dry to a depth of 75 cm; 3 or 4 moist and 3 to 6 dry below a depth of 75 cm
Chroma--1 or less to a depth of 100 cm; 0 to 2 below a depth of 100 cm
Fine-earth texture--clay, silty clay
Clay content--55 to 70 percent
Sand content--1 to 10 percent
Total fragment content--0 to 3 percent
Reaction--5.6 to 7.3
Thickness--100 to 150 cm
Cg horizon
Hue--10YR, 2.5Y, 5Y, neutral
Value--3 or 4 moist, 3 to 6 dry
Chroma--0 to 2 moist or dry
Fine-earth texture--clay, silty clay, sandy clay
Clay content--45 to 70 percent
Sand content--5 to 45 percent
Total fragment content--0 to 5 percent
Reaction--6.1 to 7.3 (may range to 7.8 in MLRA 5)
COMPETING SERIES:
Coker--secondary calcium carbonates below a depth of 50 cm
Natroy--as much as 65 percent clay in particle-size control section; chroma of more than 1; hue of 10YR, 7.5YR, or 2.5Y
Padigan--secondary calcium carbonates below a depth of 50 cm
GEOGRAPHIC SETTING:
Elevation--30 to 250 m
Climate--warm, dry summers; cool, moist winters
Mean annual precipitation--750 to 1500 mm
Mean annual air temperature--10 to 13 degrees C
Mean January air temperature--4 degrees C
Mean July air temperature--19 degrees C
Frost-free period--160 to 235 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Awbrig--abrupt textural change; in similar positions
Coburg--mollic epipedon; moderately well drained; on linear positions of stream terraces
Courtney--very gravelly or extremely gravelly C horizon within a depth of 100 cm; in similar positions
Cove--no intersecting slickensides; on flood-plain steps of the
Ingram geomorphic surface
Waldo--fine-loamy; no intersecting slickensides; on flood-plain steps of the
Ingram geomorphic surface
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--poorly drained
Saturation in normal years--apparent water table to the surface in November through May
Flooding--frequent, long periods in December through April where mapped on flood plains
Ponding--frequent, very long periods in December through April
Saturated hydraulic conductivity (Ksat)--low
USE AND VEGETATION:
Use--production of pasture and spring grain
Potential natural vegetation--sedges, rushes, grasses, Oregon ash, willows
DISTRIBUTION AND EXTENT: Willamette Valley, MLRA 2; Umpqua Valley, MLRA 5; moderate extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Benton County (Benton Area), Oregon; 1970
REMARKS:
Diagnostic features recognized in this pedon
*Particle-size control section--zone from 25 to 100 cm
*Ochric epipedon
*Slickensides--zone from 8 to 122 cm
*Cambic horizon--zone from 8 to 122 cm
*Aquic conditions--zone from 0 to 152 cm
Within the Willamette Valley, the Bashaw soils are primarily on the Winkle geomorphic surface but some flooded phases are on the Ingram geomorphic surface.
The elevation typically is 30 to 120 m in MLRA 2 and 120 to 250 m in MLRA 5. The mean annual precipitation typically is 1000 to 1500 mm in MLRA 2 and 750 to 1400 mm in MLRA 5. The frost-free period generally is 165 to 210 days in MLRA 2.
08/2017--This official series description was updated according to SSR01 Technical Note 11--Content and Format of Official Series Descriptions (revised 11/2017). Most of the changes were in formatting. No major technical changes were made. Update projects have been proposed to determine whether the concepts of the Bashaw series should extend into MLRA 5.
05/94--The classification was changed from Typic Pelloxererts to Xeric Endoaquerts.
ADDITIONAL DATA:
Characterization data--sample numbers S99OR-043-001, S96OR-043-003, and S92OR-003-004; Kellogg Soil Survey Laboratory, Lincoln, NE; 12/01
National Cooperative Soil Survey
U.S.A.