LOCATION UPPERSODA               OR

Tentative Series
DRJ/KMS/DCR
02/2025

UPPERSODA SERIES

Landscape--western Cascade glaciated mountains
Landform--colluvial aprons, glacial-valley walls, mountains
Slope--2 to 55 percent
Parent material--colluvium and till derived from volcanic rocks mixed with volcanic ash
Mean annual precipitation--about 2100 mm
Mean annual air temperature--about 6 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--frigid
Soil moisture subclass--typic

TAXONOMIC CLASS: Medial, amorphic, frigid Typic Hapludands

TYPICAL PEDON: Uppersoda gravelly medial loam on a forested, 45-percent slope at an elevation of 1145 m

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

A1--5 to 15 cm; gravelly medial loam, brown (7.5YR 4/3) dry, dark brown (7.5YR 3/2) moist; weak medium granular structure; soft, very friable, nonsticky and nonplastic; many very fine, fine, and medium, common coarse, and few very coarse roots; many very fine irregular pores; 15 percent gravel and 1 percent cobbles; strongly acid (pH 5.2); clear wavy boundary

A2--15 to 38 cm; gravelly medial loam, brown (7.5YR 5/3) dry, dark brown (7.5YR 3/3) moist; weak medium granular structure; soft, very friable, nonsticky and nonplastic; many very fine, fine, and medium, common coarse, and few very coarse roots; many very fine irregular pores; 24 percent gravel and 1 percent cobbles; strongly acid (pH 5.4); clear wavy boundary

Bw1--38 to 81 cm; gravelly medial loam, light brown (7.5YR 6/4) dry, brown (7.5YR 4/4) moist; weak medium subangular blocky structure; soft, friable, nonsticky and nonplastic; common very fine through coarse roots; many very fine, fine, and medium dendritic tubular pores; 20 percent gravel, 4 percent cobbles, and 1 percent stones; moderately acid (pH 5.6); gradual wavy boundary

Bw2--81 to 150 cm; gravelly medial loam, light brown (7.5YR 6/4) dry, brown (7.5YR 4/4) moist; weak medium subangular blocky structure; soft, friable, nonsticky and nonplastic; few very fine through coarse roots; few very fine, fine, and medium dendritic tubular pores; 25 percent gravel, 4 percent cobbles, and 1 percent stones; moderately acid (pH 5.7)

TYPE LOCATION: Linn County, Oregon; about 47 km east of Sweet Home and 6 km southwest of the junction of Forest Service Road 15 and OR Highway 20; 500 m north and 360 m west of the southeast corner of section 15, T. 14 S., R. 5 E.; latitude 44.3498333, longitude -122.1920556, datum WGS 84 (coordinates determined with a GPS)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--6 to 8 degrees C
Thickness of umbric epipedon--25 to 75 cm
Ammonium oxalate extractable Al + 1/2 Fe--2 to 4 percent
Phosphate retention--85 to 100 percent
Volcanic glass content in 0.02- to 2.0-mm fraction--5 to 30 percent
15-bar water retention--greater than 15 percent (dried samples)
1/3-bar bulk density--0.6 to 1.1 g/cm3
Fine-earth texture--medial sandy loam, medial loam
Clay content--7 to 18 percent
Sand content--35 to 60 percent

O horizon
*Thickness--0 to 10 cm

A1 horizon
*Hue--7.5YR, 10YR
*Value--2 to 3 moist, 3 to 5 dry
*Chroma--2 or 3 moist or dry
*Total fragment content--5 to 35 percent
*Gravel content--5 to 35 percent
*Cobble content--0 to 10 percent
*Stone content--0 to 5 percent
*Reaction--pH 5.1 to 6.0
*Thickness--10 to 36 cm

A2 or AB horizon
*Hue--10YR, 7.5YR
*Value--3 or 4 moist, 3 to 5 dry
*Chroma--2 to 4 moist, 3 to 6 dry
*Total fragment content--5 to 35 percent
*Gravel content--5 to 35 percent
*Cobble content--0 to 10 percent
*Stone content--0 to 5 percent
*Reaction--pH 5.1 to 6.0
*Thickness--20 to 30 cm

Bw1 horizon
*Hue--10YR, 7.5YR
*Value--3 to 5 moist, 4 to 6 dry
*Chroma--3 to 6 moist, 4 to 6 dry
*Total fragment content--10 to 35 percent
*Gravel content--10 to 35 percent
*Cobble content--0 to 25 percent
*Stone content--0 to 10 percent
*Reaction--pH 5.1 to 6.0
*Thickness--50 to 100 cm

Bw2 or BC horizon
*Hue--2.5Y, 10YR, 7.5YR
*Value--4 to 6 moist or dry
*Chroma--3 to 6 moist, 4 to 6 dry
*Total fragment content--20 to 60 percent
*Gravel content--10 to 35 percent
*Cobble content--0 to 25 percent
*Stone content--0 to 10 percent
*Boulder content--0 to 10 percent
*Reaction--pH 5.1 to 6.0

COMPETING SERIES:
Larchmount--greater than 18 percent apparent clay content in the particle-size control section
Lempira--greater than 18 percent clay in the lower part of the particle-size control section
Menagerie--18 to 27 percent clay in the particle-size control section
Zynbar--30 to 60 percent volcanic glass in the 0.02- to 2.0 mm fraction throughout the particle-size control section

GEOGRAPHIC SETTING:
Elevation--670 to 1350 m
Climate--warm, dry summers; cool, wet winters
Mean annual precipitation--1400 to 2700 mm
Mean annual air temperature--5 to 7 degrees C
Frost-free period--90 to 150 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Soapgrass--cryic soil temperature regime; located on colluvial aprons, cirque floors, cirque headwalls, glacial-valley walls, mountain slopes, and mountains
Chucksney--cryic soil temperature regime; located on south-facing mountains, mountain slopes, and glacial-valley walls

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturation in normal years--none in profile
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high

USE AND VEGETATION:
Use--watershed, recreation, wildlife habitat, timber production
Potential natural vegetation--Douglas-fir, western hemlock, Pacific rhododendron, Cascade barberry, salal, whiteveined wintergreen, red huckleberry, snow raspberry, twinflower

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 Upper Soda, in Willamette National Forest

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 38 cm
*Cambic horizon--zone from 38 to 150 cm
*Andic soil properties--zone from 5 to 150 cm
*Volcanic glass--zone from 5 to 150 cm

06/2023--Reclassified from Medial, amorphic, frigid Humic Udivitrands to Medial, amorphic, frigid Typic Hapludands. All mineral horizons meet criteria #3 for andic soil properties in the 13th edition of Keys to Soil Taxonomy. All pedons have third-bar bulk density low enough to also meet criteria #2 (no ash required) throughout the umbric epipedon. Some pedons meet criteria #2 throughout the profile.

06/2016--dense till was observed between depths of 100 and 150 cm in some areas of Uppersoda soils in the Willamette National Forest.

ADDITIONAL DATA: Type location user site ID--2013OR043007

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National Cooperative Soil Survey
U.S.A.