LOCATION BOLONQUI OR
Tentative Series
GJC/KLM/KMS
12/2024
BOLONQUI SERIES
Slope--0 to 5 percent
Parent material--alluvium derived from mixed sources
Mean annual precipitation--about 330 mm
Mean annual air temperature--about 8 degrees C
Depth class--very deep
Drainage class--somewhat poorly drained
Soil temperature regime--mesic
Soil moisture regime--xeric
Soil moisture subclass-- typic
TAXONOMIC CLASS: Coarse-loamy over sandy or sandy-skeletal, mixed, superactive, mesic Cumulic Haploxerolls
TYPICAL PEDON: Bolonqui silt loam, pasture, on a 1 percent slope at an elevation of 1,138 meters.
A--0 to 18 cm; silt loam, dark gray (10YR 4/1) dry, black (10YR 2/1) moist; weak fine granular structure; soft, very friable, slightly sticky, slightly plastic; many very fine and fine roots throughout; common very fine and fine irregular and few medium irregular pores; noneffervescent; slightly acid (pH 6.4); clear smooth boundary
AB--18 to 38 cm; loam, dark gray (10YR 4/1) dry, black (10YR 2/1) moist; weak medium subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; many very fine and fine roots throughout; common very fine and fine dendritic tubular pores; neutral (pH 6.6); clear smooth boundary
Bg--38 to 53 cm; loam, dark grayish brown (10YR 4/2) dry, very dark brown (10YR 2/2) moist; weak coarse subangular blocky structure; slightly hard, very friable, slightly sticky, slightly plastic; few very fine and fine roots throughout; common very fine and fine dendritic tubular pores; 5 percent fine faint irregular, strong brown (7.5YR 4/6) moist, iron-manganese masses on faces of peds; 10 percent rounded fine gravel; neutral (pH 6.6); abrupt smooth boundary
2C--53 to 152 cm; extremely gravelly loamy sand, variegated; single grain; loose, loose, nonsticky, nonplastic; few fine roots; many very fine and fine irregular pores; 60 percent rounded gravel; neutral (pH 6.6).
TYPE LOCATION: Grant County, Oregon, 450 meters south and 70 meters east of the northeast corner of section 27, T. 13 S., R. 34 E.: latitude 44.4134580, longitude -118.5943700, WGS84 Datum (Coordinates estimated from PLSS details)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--7 to 10 degrees C
Soil moisture--The soils are usually moist and are dry for 70 to 90 consecutive days following the summer solstice
Mollic epipedon--50 to 75 cm
Depth to redoximorphic features--25 to 50 cm
Depth to strongly contrasting textural stratification--50 to 100 cm
Particle Size Control Section:
*Clay--10 to 18 percent in upper part, 2 to 10 percent in lower part
*Total fragments--0 to 60 percent
A horizon
*Hue--10YR
*Value--4 or 5 dry, 2 or 3 moist
*Chroma--1 to 2 dry or moist
*Fine-earth texture--silt loam, loam
*Clay--15 to 25 percent
*Sand--15 to 45 percent
*Organic matter--2 to 6 percent
*Total fragments--0 to 35 percent
*Gravel--0 to 35 percent
*Cobbles--0 to 3 percent
*Reaction--slightly acid to neutral (pH 6.1 to 7.3)
AB horizon
*Hue--10YR
*Value--4 or 5 dry, 2 or 3 moist
*Chroma--1 to 2 dry or moist
*Fine-earth texture--silt loam, loam
*Clay--10 to 18 percent
*Sand--15 to 50 percent
*Organic matter--2 to 4 percent
*Total fragments--0 to 35 percent
*Gravel--0 to 35 percent
*Cobbles--0 to 5 percent
*Reaction--neutral (pH 6.6 to 7.3)
Bg horizon
*Hue--10YR
*Value--4 or 5 dry, 2 or 3 moist
*Chroma--1 to 3 dry or moist
*Fine-earth texture--silt loam, loam
*Clay--10 to 18 percent
*Sand--15 to 50 percent
*Organic matter--1 to 3 percent
*Total fragments--0 to 35 percent
*Gravel--0 to 35 percent
*Cobbles--0 to 5 percent
*Reaction--neutral (pH 6.6 to 7.3)
2C horizon
*Hue--10YR or 2.5YR (or variegated)
*Value--1 to 3 dry or moist
*Chroma--1 to 4 dry or moist
*Fine-earth texture--sand, loamy sand
*Clay--2 to 10 percent
*Sand--75 to 95 percent
*Organic matter--0 to 1 percent
*Total fragments--15 to 75 percent
*Gravel--10 to 60 percent
*Cobbles--0 to 15 percent
*Reaction--neutral (pH 6.6 to 7.3)
COMPETING SERIES:
DRYCK--well drained; do not have saturated conditions above 100 cm; have an aridic moisture regime
VEAZIE-- well drained; do not have saturated conditions above 100 cm
YAKIMA-- well drained; do not have saturated conditions above 100 cm; have an aridic moisture regime
GEOGRAPHIC SETTING:
Elevation--750 to 1125 m
Climate--cool, wet winters and hot, dry summers
Mean annual precipitation--300 to 360 mm
Mean annual air temperature--7 to 10 degrees C
Frost-free period--70 to 110 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Hack--occurs on alluvial fans; greater than 200 cm to restrictive feature; averages 18 to 27 percent clay in the particle size control section
Grousehunt--occurs on low stream terraces; saturated conditions for some time between 50 and 100 cm (somewhat poorly drained); averages 18 to 27 percent clay in the upper part of the particle size control section
Dayville--occurs on stream terraces; does not have saturated conditions within 200cm (well drained)
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Saturation during normal years--endosaturation occurs from 50 to 200 cm January through May
Flooding--rarely flooded, brief duration, January through May
Ponding--none
Saturated hydraulic conductivity (Ksat)--moderately high to high in the upper part, high to very high in the lower part
USE AND VEGETATION:
Use--hay production, pasture, wildlife habitat
Potential native vegetation--
DISTRIBUTION AND EXTENT:
Distribution--East-Central Oregon, John Day River Valleys, MLRA 10
Extent--small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: 2017
REMARKS:
Diagnostic horizons and features recognized in this pedon are--
*Mollic epipedon--
*Endosaturation--
*Redoximorphic features--
*Strongly contrasting textural stratification--
*Particle-size control section--
The Bolonqui series was proposed to recognize and differentiate the somewhat poorly drained version of the Courtrock series (well drained), originally mapped in the 1980 OR633 Grant County Soil Survey.
National Cooperative Soil Survey
U.S.A.