LOCATION RUDIO                   OR

Tentative Series
Rev. KMS
02/2025

RUDIO SERIES

Landscape--plateau
Landform-- depressions, drainageways
Slope--0 to 5 percent
Parent material--residuum from igneous extrusive rock with a minor influence of volcanic ash in the surface
Mean annual precipitation--450 mm
Mean annual air temperature--6 degrees C
Depth class--moderately deep
Drainage class--poorly drained
Soil moisture regime--aquic, xeric
Soil temperature regime--cryic
Soil moisture subclass--typic

TAXONOMIC CLASS: Fine, smectitic Aquic Argicryolls

TYPICAL PEDON: Rudio mucky ashy sandy loam - wet meadow, on 3 percent slope at an elevation of 1600 meters. (Colors are for dry soil unless otherwise noted.)

Ag--0 to 5 cm; very dark grayish brown (10YR 3/2) mucky ashy sandy loam, black (10YR 2/1) moist; strong fine granular structure; very friable, slightly hard, slightly sticky and slightly plastic; many very fine, many fine and common roots throughout; many very fine and fine irregular pores; neutral (pH 6.8); clear wavy boundary. (2 to 8 cm thick)

2ABtg-- 5 to 13 centimeters; very dark gray (10YR 3/1) silty clay, black (10YR 2/1) moist; strong medium granular structure; very friable, hard, moderately sticky and moderately plastic; many very fine and fine roots throughout; many very fine and fine irregular pores; few distinct clay films on all faces of peds; neutral (pH 7.0); clear wavy boundary. (5 to 15 cm thick)

2Bt1-- 13 to 60 centimeters; dark grayish brown (10YR 4/2) clay, very dark grayish brown (10YR 3/2) moist; moderate medium prismatic structure; extremely firm, very hard, very sticky and very plastic; common very fine and many fine roots throughout; common very fine irregular pores; many prominent clay films on all faces of peds; 1 percent basalt gravel; neutral (pH 7.2); gradual wavy boundary.

2Bt2-- 60 to 78 centimeters; brown (10YR 5/3) cobbly clay loam, dark brown (10YR 3/3) moist; moderate medium prismatic structure; very firm, hard, moderately sticky and moderately plastic; many very fine and fine roots throughout; common fine irregular pores; few distinct clay films on all faces of peds; common fine iron-manganese masses; 5 percent basalt gravels, 10 percent basalt cobbles; neutral (pH 7.2); clear wavy boundary. (combined thickness of 2Bt1 and 2Bt2 is 50 to 76 cm)

2Cr-- 78 centimeters; weathered basalt.

TYPE LOCATION: Grant County, Oregon; 650 m east and 210 m north of the SE corner of section 19, Township 10S. Range 27E.; latitude 44.6836662, longitude -119.5184479, WGS84 Datum (coordinates determined with GPS)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--6 to 8 degrees C.
Soil moisture--endosaturated and episaturated in the spring and early summer
Depth to paralithic contact--50 to 100 centimeters
Mollic epipedon--50 to 100 cm

Properties of layers influenced by volcanic ash
*Ash influenced layer thickness--2 to 8 cm
*Volcanic glass content in the .02 to 2 mm fraction--5 to 20 percent
*Ammonium oxalate extractable Al plus 1/2 Fe--0.4 to 1.0 percent

Particle size control section
*Clay content--35 to 55 percent
*Total rock fragment content--0 to 15 percent
*Gravel content--0 to 10 percent
*Cobble content--0 to 15 percent cobbles;

Ag horizon
*Hue--10YR
*Value--2 moist, 2 or 3 dry
*Chroma--1 or 2 moist or dry
*Fine earth texture--sandy loam, loam
*Clay content--10 to 18 percent
*Sand content--45 to 70 percent
*Organic matter content--10 to 12 percent
*Rubbed fibers--10 to 15 percent
*Reaction--neutral
*Thickness--2 to 8 cm
2ABtg horizon
*Hue--10YR
*Value--2 moist, 2 or 3 dry
*Chroma--1 or 2 moist or dry
*Fine-earth texture--silty clay loam or silty clay
*Clay content--35 to 45 percent
*Sand content--5 to 20 percent
*Organic matter content--3 to 6 percent
*Reaction--neutral
*Thickness--5 to 15 cm

2Bt horizons
*Hue--10YR
*Value--3 moist, 4 or 5 dry
*Chroma--2 or 3 moist or dry
*Fine-earth texture--clay or clay loam
*Clay content--35 to 55 percent
*Sand content--15 to 45 percent
*Organic matter content--1 to 4 percent
*Total rock fragments--0 to 15 percent
*Gravel content--0 to 10 percent
*Cobble content--0 to 15 percent
*Reaction--neutral
*Thickness--50 to 76 cm

COMPETING SERIES:
Leroux--greater than 150 cm to a restrictive layer.

GEOGRAPHIC SETTING:
Elevation--1550 to 1675 m
Climate--cold, wet winters, mild, dry summers
Mean annual precipitation--425 to 475 mm
Mean annual air temperature--6 degrees C
Frost free period--30 to 70 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Ateron--occurs on uplands on plateaus; lacks water table and has lithic contact at 25 to 50 cm.
Canest--occurs on uplands on plateau; lacks water table and has lithic contact at 10 to 25 cm.
Fivebit--occurs on forested uplands on plateaus; lacks water table and has lithic contact at 25 to 50 cm.
Klicker--occurs on forested uplands on plateaus; lacks water table.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage--poorly drained
Saturation during normal years--episaturation and endosaturation in the spring and early summer
Flooding--none
Ponding--frequent
Saturated hydraulic conductivity (Ksat)--moderately slow

USE AND VEGETATION:
Use--livestock grazing, wildlife habitat
Potential native vegetation--sedges and rushes
Typical ecological site--Cold Meadow (R010XY002OR)

DISTRIBUTION AND EXTENT: Central Oregon; MLRA 10. Rudio soils area of very small extent.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana

SERIES PROPOSED: Grant County, Oregon, 2015.

REMARKS:
Diagnostic horizons and features include
Mollic epipedon--0 to 78 cm
Argillic horizon--5 to 78 cm
Paralithic contact--78 cm
Lithologic Discontinuity--5 cm
Volcanic glass--0 to 5 cm
Endosaturation--60 to 78 cm
Episaturation--0 to 13 cm
Particle-size control section--5 to 55 cm

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National Cooperative Soil Survey
U.S.A.