LOCATION MOOSERIDGE              OR

Tentative Series
JGM/KMS/DCR
02/2025

MOOSERIDGE SERIES

Landscape--western Cascade mountains
Landform--complex landslides, earthflows, mountainbases of mountain slopes
Slope--0 to 45 percent
Parent material--colluvium and residuum derived from tuff
Mean annual precipitation--about 1700 mm
Mean annual air temperature--about 9 degrees C
Depth class--very deep
Drainage class--moderately well drained
Soil moisture regime--udic
Soil temperature regime--mesic
Soil moisture subclass--oxyaquic

TAXONOMIC CLASS: Fine-loamy, isotic, mesic Andic Oxyaquic Humudepts

TYPICAL PEDON: Mooseridge silt loam on a forested, south-facing, 7-percent slope at an elevation of 502 m (The soil was moist throughout when described on May 18, 2016.)

Oi--0 to 4 cm; slightly decomposed plant material; clear smooth boundary

A1--4 to 18 cm; silt loam, dark grayish brown (10YR 4/2) dry, very dark brown (10YR 2/2) moist; moderate fine granular structure; soft, very friable, nonsticky and slightly plastic; common very fine to coarse roots; many fine irregular pores and common fine dendritic tubular pores; moderately acid (pH 6.0); clear smooth boundary

A2--18 to 27 cm; loam, dark grayish brown (10YR 4/2) dry, very dark grayish brown (10YR 3/2) moist; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine to medium and few coarse roots; common fine irregular pores; moderately acid (pH 5.8); clear wavy boundary

BA--27 to 40 cm; clay loam, dark yellowish brown (10YR 3/4) dry, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure; moderately hard , friable , slightly sticky and moderately plastic; common very fine to medium and few coarse roots; common fine irregular and dendritic tubular pores; moderately acid (pH 5.8); gradual wavy boundary

Bw1--40 to 75 cm; clay loam, brown (7.5YR 4/4) dry, dark brown (7.5YR 3/4) moist; moderate medium subangular blocky structure; hard , friable, moderately sticky and moderately plastic; common very fine to coarse roots; common fine irregular dendritic tubular pores; 5 percent gravel; moderately acid (pH 5.6); gradual smooth boundary

Bw2--75 to 110 cm; silty clay loam, brown (7.5YR 4/4) dry, dark brown (7.5YR 3/4) moist; weak medium subangular blocky structure; hard, friable, moderately sticky and moderately plastic; common fine and medium and few coarse roots; common fine irregular and dendritic tubular pores; 2 percent dark yellowish brown (10YR 4/6) moist iron-manganese masses in matrix and 2 percent black (7.5YR 2.5/1) moist manganese coatings on faces of peds; 5 percent gravel; strongly acid (pH 5.5); gradual smooth boundary

Bw3 --110 to 150 cm; clay loam, dark brown (7.5YR 3/4) dry, dark reddish brown (5YR 3/4) moist; weak coarse subangular blocky structure; hard, friable, moderately sticky and moderately plastic; common fine and medium and few coarse roots; common fine irregular and dendritic tubular pores; 2 percent dark grayish brown (10YR 4/2) moist iron depletions on surfaces along root channels, 2 percent iron-manganese masses in matrix, and 2 percent black (7.5YR 2.5/1) moist manganese coatings on faces of peds; 5 percent gravel; strongly acid (pH 5.5 )

TYPE LOCATION: Linn County, Oregon, about 24 km east of Sweet Home, in Willamette National Forest; 430 m north and 150 m east of the southwest corner of section 26, T. 13 S., R. 3 E., Willamette Meridian; latitude 44.40647, longitude -122.42043, datum WGS 84 (coordinates determined with a GPS)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--7 to 10 degrees C
Thickness of umbric epipedon--25 to 50 cm
Depth to redoximorphic concentrations--50 to 100 cm
Reaction--pH 5.0 to 6.0

Particle size control section
*Clay content--27 to 35 percent (weighted average)
*Total fragment content--0 to 35 percent (weighted average)

Properties of layers meeting andic subgroup criteria
*1/3-bar bulk density--0.70 to 1.0 g/cm3
*Phosphate retention--50 to 100 percent
*Ammonium oxalate Al plus 1/2 Fe--1 to 2 percent
*Volcanic glass content in the coarse silt fraction--5 to 10 percent
*Thickness--18 to 50 cm

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

A horizons
*Hue--10YR, 7.5YR
*Value--2 or 3 moist, 3 to 5 dry
*Chroma--1 or 2 moist, 2 or 3 dry
*Fine-earth texture--loam, silt loam
*Clay content--18 to 27 percent
*Sand content--20 to 45 percent
*Total fragment content--0 to 15 percent
*Gravel content--0 to 15 percent
*Paragravel content--0 to 5 percent
*Cobble content--0 to 5 percent
*Combined thickness--18 to 30 cm

BA horizon (where present)
*Hue--10YR, 7.5YR
*Value--2 or 3 moist, 3 to 5 dry
*Chroma--2 or 3 moist or dry
*Fine-earth texture--clay loam, loam, silt loam
*Clay content--22 to 35 percent
*Sand content--20 to 40 percent
*Total fragment content--0 to 15 percent
*Gravel content--0 to 15 percent
*Paragravel content--0 to 10 percent
*Cobble content--0 to 5 percent
*Thickness--0 to 20 cm

Bw1 and Bw2 horizons
*Hue--7.5YR, 10YR
*Value--3 or 4 moist, 4 to 6 dry
*Chroma--2 to 6 moist or dry
*Fine-earth texture--clay loam, silty clay loam
*Clay content--27 to 35 percent
*Sand content--15 to 35 percent
*Total fragment content--0 to 35 percent
*Gravel content--0 to 20 percent
*Paragravel content--0 to 15 percent
*Cobble content--0 to 5 percent
*Combined thickness--30 to 100 cm

Bw3 horizon, and C horizon (where present)
*Hue--5YR to 10YR
*Value--3 or 4 moist, 4 to 6 dry
*Chroma--4 to 6 moist or dry
*Fine-earth texture--clay loam, silty clay loam
*Clay content--27 to 40 percent
*Sand content--15 to 30 percent
*Total fragment content--0 to 35 percent
*Gravel content--0 to 30 percent
*Paragravel content--0 to 35 percent
*Cobble content--0 to 5 percent

COMPETING SERIES: None

GEOGRAPHIC SETTING:
Elevation--240 to 910 m
Climate--mild, wet winters; warm, dry summers
Mean annual precipitation--1200 to 1900 mm
Mean annual air temperature--7 to 10 degrees C
Frost free period--120 to 180 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Kinney--well drained; located on mountain slopes and complex landslides
Aschoff--averages greater than 35 percent rock fragments in the particle-size control section; located on mountain slopes and colluvial aprons
Ramcreek--frigid soil temperature regime; located on complex landslides

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--moderately well drained
Saturation in normal years--below a depth of 50 to 100 cm in November through May
Flooding--none
Ponding--none
Saturated hydraulic conductivity--moderately high

USE AND VEGETATION:
Use--watershed, recreation, wildlife habitat, timber production
Potential natural vegetation--Douglas-fir, western hemlock, vine maple, salal, Cascade barberry, western swordfern, British Columbia wildginger, starry false lily of the valley; commonly support a western hemlock/vine maple/swordfern-Northwest Oregon Cascades (CHS228) plant association

DISTRIBUTION AND EXTENT: Western Cascade Mountains, Oregon; MLRA 3; small extent

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

SERIES PROPOSED: Willamette National Forest, Linn County, Oregon; name from landmark in Linn County

REMARKS:
Diagnostic horizons and other features in this pedon
*Particle-size control section--zone from 29 to 104 cm
*Umbric epipedon--zone from 4 to 40 cm
*Andic subgroup feature--zone from 4 to 27 cm
*Cambic horizon--zone from 40 to 150 cm
*Aquic conditions--zone from 75 to 150 cm
*Redox concentrations--zone from 75 to 150 cm
*Endosaturation--zone from 75 to 150 cm
*Redox depletions with chroma 2 or less--zone from 110 to 150 cm

5/2023--Laboratory data for geographically associated soils support andic subgroup criteria in the 13th edition of Keys to Soil Taxonomy.

ADDITIONAL DATA: Type location user site ID--2016OR043903

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National Cooperative Soil Survey
U.S.A.