LOCATION BREITENBUSH             OR

Tentative Series
ASC/MPR
12/2024

BREITENBUSH SERIES

Landscape--High Cascade volcanic fields
Landform--lava flows
Slope--0 to 30 percent
Parent material--volcanic ash and residuum derived from vesicular basalt
Mean annual precipitation--about
Mean annual air temperature--about 6 degrees C
Depth class--very deep
Drainage class--somewhat excessively drained
Soil moisture regime--xeric
Soil temperature regime--frigid
Soil moisture subclass--typic

TAXONOMIC CLASS: Ashy-skeletal, amorphic, frigid Humic Vitrixerands

TYPICAL PEDON: Breitenbush extremely cobbly ashy loamy sand, on a forested lava flow with a slope of 12 percent and an elevation of 1225 m

Oi--0 to 5 cm; slightly decomposed plant material, abrupt smooth boundary

A1--5 to 13 cm; extremely cobbly ashy loamy sand, brown (7.5YR 5/3) dry, dark brown (7.5YR 3/3) moist; weak fine subangular blocky structure; soft, very friable, nonsticky, nonplastic; common very fine and fine roots; common very fine and fine interstitial pores; 20 percent gravel, 40 percent cobbles, 15 percent stones; moderately acid (pH 5.8); clear smooth boundary

A2 --13 to 33 cm; extremely cobbly ashy loamy sand, brown (7.5YR 5/3) dry, dark brown (7.5YR 3/3) moist; weak fine subangular blocky structure; soft, very friable, nonsticky, nonplastic; common very fine and many fine roots; common very fine and fine interstitial pores; 15 percent gravel, 40 percent cobbles, and 5 percent stones; moderately acid (pH 5.8); clear smooth boundary

Bw1--33 to 60 cm; very cobbly ashy sand, brown (10YR 5/3) dry, very dark grayish brown (10YR 3/2) moist; weak fine subangular blocky structure; soft, very friable, nonsticky, nonplastic; common fine and medium roots, few coarse roots; many very fine and fine interstitial pores, few fine dendritic tubular pores; 20 percent gravel and 20 percent cobbles; moderately acid (pH 6.0); gradual smooth boundary

Bw2--60 to 85 cm; very gravelly ashy sand, brown (10YR 5/3) dry, very dark grayish brown (10YR 3/2) moist; weak fine subangular blocky structure; soft, very friable, nonsticky, nonplastic; common fine and medium roots; common very fine and fine interstitial pores, few fine dendritic tubular pores; 30 percent gravel and 10 percent cobbles; moderately acid (pH 6.0); clear smooth boundary

C1--85 to 105 cm; very gravelly ashy sand, dark brown (10YR 3/3) dry, very dark brown (10YR 2/2) moist; single grain; loose, nonsticky, nonplastic; few fine and medium roots; many fine interstitial pores; 50 percent gravel and 5 percent cobbles; moderately acid (pH 5.8); gradual smooth boundary

C2--105 to 150 cm; gravelly ashy sand, dark brown (10YR 3/3) dry, black (10YR 2/1) moist; single grain; loose, nonsticky, nonplastic; few fine and medium roots; many fine interstitial pores; 30 percent gravel; moderately acid (pH 5.8)

TYPE LOCATION: Linn County, Oregon, about 4 km southwest of Santiam Junction, in Willamette National Forest; 150 m south and 530 m west of the northeast corner of section 34, T. 13 S., R. 7 E., Willamette Meridian; latitude 44.4021830, longitude -121.9551840, datum WGS 84 (coordinates determined with a GPS)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--6 to 8 degrees C
Moisture control section--usually moist, but dry in all parts 45 to 60 consecutive days following the summer solstice
Thickness of umbric epipedon--25 to 50 cm
Depth to bedrock--greater than 150 cm
Thickness of andic soil properties--greater than 100 cm

Particle-size control section
*Total rock fragments--greater than 35 percent
*Volcanic glass content in 0.02 to 2.0 mm fraction--60 to 90 percent
*Phosphate retention--greater than 50 percent
*Ammonium oxalate Al plus 1/2 Fe--1 to 2 percent
*1500 kPa water (air-dried samples)--less than 12 percent
*1500 kPa water (undried)--less than 30 percent

O horizon
*Composition--slightly decomposed plant material
*Thickness--0 to 6 cm

A horizons
*Hue--7.5YR, 10YR
*Value--2 to 3 moist, 4 or 5 dry
*Chroma--2 or 3 moist and dry
*Clay content--2 to 10 percent
*Sand content--greater than 80 percent
*Total fragment content--35 to 85 percent
*Gravel content--0 to 40 percent
*Cobble content--15 to 60 percent
*Stone content--5 to 30 percent
*Reaction--pH 5.1 to 6.0
*Organic carbon content--1 to 3 percent
*Thickness--25 to 50 cm

Bw horizons
*Value--2 or 3 moist, 3 to 5 dry
*Chroma--2 or 3 moist and dry
*Fine -earth texture--ashy loamy sand, ashy sand
*Clay content--less than 5 percent
*Sand content--80 to 95 percent
*Total fragment content--35 to 65 percent
*Gravel content--15 to 50 percent
*Cobble content--5 to 35 percent
*Stone content--0 to 40 percent
*Reaction--pH 5.6 to 6.0

C horizons
*Value--2 or 3 moist, 3 to 5 dry
*Chroma--1 to 3 moist and dry
*Clay content--less than 5 percent
*Sand content--greater than 85 percent
*Total fragment content--15 to 85 percent
*Gravel content--10 to 65 percent
*Cobble content--0 to 40 percent
*Stone content--0 to 40 percent
*Reaction--pH 5.6 to 6.5
*Organic carbon content--less than 0.4 percent

COMPETING SERIES:
Firoke --Well drained; soil moisture control section is dry in all parts 60 to 75 consecutive days following the summer solstice; loamy textures throughout the particle-size control section

GEOGRAPHIC SETTING:
Elevation --700 to 1400 m
Climate--warm, dry summers; cool, wet winters
Mean annual precipitation--1800 to 2150 mm
Mean annual air temperature--5 to 7 degrees C
Frost -free period--75 to 135 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Simsbutte--depth to fragmental or cindery material is 25 to 75 cm below the mineral soil surface, soil moisture control section is dry in all parts for less than 45 consecutive days following the summer solstice; located on cinder cones
Lavaflat--soil moisture control section is dry in all parts for less than 45 consecutive days following the summer solstice; located on lava flows
Littlenash--depth to fragmental or cindery material is 25 to 75 cm below the mineral soil surface; located on cinder cones
Potatohill--moderately coarse textured or medium textured, soil moisture control section is dry in all parts for less than 45 consecutive days following the summer solstice; located on lava flows

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--somewhat excessively drained
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high

USE AND VEGETATION:
Use --water supply, wildlife habitat, recreation
Potential natural vegetation--Douglas-fir, grand fir, western white pine, giant chinquapin, Cascara buckthorn, Oregon boxleaf, pipsissewa, kinnikinnick; commonly supports a grand fir/kinnikinnick (CWS521) plant association (see Field Guide to the Forested Plant Associations of the Westside Central Cascades of Northwest Oregon)

DISTRIBUTION AND EXTENT: High Cascades, Oregon; MLRA 3; small extent

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

SERIES PROPOSED: Willamette National Forest, Linn County, Oregon; 2023; name from Lewis Breitenbucher, a one-armed pioneer who assisted John Minto's survey party over the Oregon Central Cascades

REMARKS:
Diagnostic horizons and other features in this pedon
*Particle-size control section--zone from 5 to 105 cm
*Umbric epipedon--zone from 5 to 33 cm
*Andic soil properties--zone from 5 to 150 cm
*Volcanic glass--zone from 5 to 150 cm

*Rock fragment content and size class is greatly variable on lava flow surfaces, especially at depth.

ADDITIONAL DATA: Typical pedon ID--2022OR043525

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National Cooperative Soil Survey
U.S.A.