LOCATION RAMCREEK OR
Tentative Series
DRJ/JGM/KMS
01/2017
RAMCREEK SERIES
Landscape--western Cascade Mountains
Landform--earthflows with some on complex landslides
Slope--0 to 30 percent
Parent material--earthflow deposits derived from igneous rock mixed with volcanic ash in upper part
Mean annual precipitation--about 2100 mm
Mean annual air temperature--about 7 degrees C
Depth--very deep
Drainage class--moderately well drained
Soil moisture regime--udic
Soil temperature regime--frigid
Soil moisture subclass--oxyaquic
TAXONOMIC CLASS: Fine-loamy, isotic, frigid Andic Oxyaquic Humudepts
TYPICAL PEDON: Ramcreek gravelly medial loam on a 10-percent slope of an active earthflow at an elevation of 780 m (The soil was moist throughout when described on June 5, 2014.)
Oe--0 to 3 cm; moderately decomposed plant material; abrupt wavy boundary
A--3 to 32 cm; gravelly medial loam, dark grayish brown (10YR 4/2) dry, very dark brown (10YR 2/2) moist; strong fine and medium granular structure; soft, very friable, slightly sticky and slightly plastic; 25 percent andesite gravel and 5 percent andesite cobbles; abrupt wavy boundary
2Bw1--32 to 45 cm; gravelly loam, pale brown (10YR 6/3) dry, brown (10YR 4/3) moist; moderate fine and medium subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; 20 percent andesite gravel and 5 percent andesite cobbles; clear wavy boundary
2Bw2--45 to 96 cm; gravelly loam, light yellowish brown (10YR 6/4) dry, olive brown (2.5Y 4/3) moist; weak fine and medium subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; 5 percent prominent iron-manganese masses in matrix, strong brown (7.5YR 4/6) moist; 20 percent andesite gravel, 5 percent andesite cobbles, and 2 percent andesite stones; abrupt wavy boundary
2Cg--96 to 150 cm; gravelly loam, light gray (2.5Y 7/2) dry, grayish brown (2.5Y 5/2) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; 15 percent prominent iron-manganese masses in matrix, strong brown (7.5YR 4/6) moist; 20 percent andesite gravel, 5 percent andesite cobbles, and 2 percent andesite stones
TYPE LOCATION: Linn County, Oregon, about 37 km east of Sweet Home and 0.6 km north of the junction of Sheepcreek Road and OR Highway 20; about 720 m south and 290 m west of the northeast corner of section 28, T. 13 S., R. 5 E.; latitude 44.410922, longitude -122.210500, datum WGS 84 (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Dry days--dry between depths of 10 and 30 cm less than 45 consecutive days following summer solstice
Mean annual soil temperature--5 to 7 degrees C
Thickness of umbric epipedon--25 to 50 cm
Depth to redoximorphic features--45 to 100 cm below mineral soil surface
Reaction--5.1 to 6.0 throughout all mineral horizons
Thickness of andic soil properties--18 to 34 cm (below mineral soil surface)
Estimated properties of layers with andic soil properties
*1/3-bar bulk density--0.6 to 0.9 g/cm3
*Phosphate retention--greater than 85 percent
*Ammonium oxalate extractable Al + Fe--2 to 4 percent
*15-bar water tension--30 to 70 percent (undried samples), greater than 15 percent (dried samples)
*Volcanic glass content in 0.02- to 2.0-mm fraction--5 to 30 percent
Particle-size control section
*Clay content--18 to 35 percent
*Total fragment content--10 to 35 percent
Oi horizon (where present)
*Thickness--0 to 3 cm
Oe horizon
*Thickness--1 to 9 cm
A horizon
*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--medial loam
*Clay content--18 to 27 percent
*Sand content--25 to 40 percent
*Total fragment content--15 to 35 percent
*Gravel content--15 to 30 percent
*Cobble content--0 to 10 percent
*Thickness--20 to 35 cm
2Bw1 horizon, and 2AB or 2A horizon (where present)
*Hue--10YR, 7.5YR
*Value--3 or 5 moist, 5 to 6 dry
*Chroma--3 or 4 moist, 5 or 6 dry
*Fine-earth texture--loam, silt loam
*Clay content--18 to 27 percent
*Sand content--25 to 40 percent
*Total fragment content--15 to 35 percent
*Gravel content--15 to 30 percent
*Cobble content--0 to 10 percent
*Thickness--13 to 45 cm
2Bw2 horizon
*Hue--10YR, 2.5Y
*Value--4 or 5 moist, 5 to 7 dry
*Chroma--2 to 4 moist, 4 to 6 dry
*Fine-earth texture--loam, clay loam, silty clay loam
*Clay content--18 to 35 percent
*Sand content--20 to 40 percent
*Total fragment content--10 to 40 percent
*Gravel content--10 to 40 percent
*Cobble content--0 to 15 percent
*Stone content--0 to 5 percent
*Paragravel content-0 to 25 percent
*Thickness--0 to 55 cm
2Cg horizon, and 2BCg horizon (where present)
*Hue--10YR, 2.5Y
*Value--4 or 5 moist, 5 to 7 dry
*Chroma--2 to 6 moist, 4 to 8 dry
*Fine-earth texture--loam, clay loam
*Clay content--20 to 40 percent
*Sand content--25 to 45 percent
*Total fragment content--10 to 50 percent
*Gravel content--10 to 40 percent
*Paragravel content--0 to 25 percent
*Cobble content--0 to15 percent
*Stone content--0 to 5 percent
COMPETING SERIES: None
GEOGRAPHIC SETTING:
Elevation--700 to 1100 m
Climate--cool, moist summers; cold, wet winters
Mean annual precipitation--1900 to 2300 mm
Mean annual air temperature--6 to 8 degrees C
Frost-free period--90 to 120 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Cadenza--no aquic conditions; skeletal; in convex or more steeply sloping positions
Browder--no aquic conditions; in more steeply sloping positions
Coffin--no aquic conditions; thicker zone with andic soil properties; in similar landform positions
Husky--aquic conditions within 25 cm of surface; in sags of complex landslides
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--moderately well drained
Saturation in normal years--below a depth of 70 to 110 cm in April and May
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high in upper part, moderately high in 2Bw2 horizon and below
USE AND VEGETATION:
Use--watershed, recreation, wildlife habitat, timber production
Potential natural vegetation--Douglas-fir, western hemlock, western redcedar, Pacific rhododendron, Cascade Oregon grape, salal, white-veined pyrola, red huckleberry, snow raspberry, twinflower
DISTRIBUTION AND EXTENT: Western Cascade Mountains, Oregon; MLRA 3; small extent
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Willamette National Forest, Linn County, Oregon; name from Ram Creek in Willamette National Forest
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Particle-size control section--zone from 3 to 103 cm
*Umbric epipedon--zone from 3 to 32 cm
*Cambic horizon--zone from 32 to 96 cm
*Aquic conditions--zone from 45 to 150 cm
*Andic soil properties--zone from 3 to 32 cm
*Volcanic glass--zone from 3 to 32 cm
*Depth to lithologic discontinuity--32 cm
06/2016--Assumed to meet criteria 2 (no ash required) for andic soil properties, in the 12th edition of Keys to Soil Taxonomy. It is also assumed that enough ash is present for the soils to meet criteria 3. Additional lab data is needed to confirm the degree of ash influence.
ADDITIONAL DATA: Type location user site ID--2014OR043006
National Cooperative Soil Survey
U.S.A.