LOCATION LUCKYBOY OR
Tentative Series
JGM/KMS
01/2017
LUCKYBOY SERIES
Landscape--western Cascade Mountains
Landform--mountain slopes, structural benches
Slope--10 to 90 percent
Parent material--colluvium derived from igneous rock mixed with volcanic ash in upper part
Mean annual precipitation--about 2100 mm
Mean annual air temperature--about 6 degrees C
Depth class--moderately deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--frigid
Soil moisture subclass--typic
TAXONOMIC CLASS: Loamy-skeletal, isotic, frigid Andic Humudepts
TYPICAL PEDON: Luckyboy very gravelly medial loam on a forested, north-facing, 75-percent slope at an elevation of 1036 m (The soil was dry throughout when observed on August 9, 2012.)
Oi--0 to 5 cm; slightly decomposed plant material; clear smooth boundary
A--5 to 36 cm; very gravelly medial loam, dark grayish brown (10YR 4/2) dry, very dark grayish brown (10YR 3/2) moist; moderate fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; moderately smeary; many very fine and fine and common medium roots; many fine irregular and tubular pores; 30 percent andesite gravel and 10 percent andesite cobbles; moderately acid (pH 5.8); clear smooth boundary
2Bw--36 to 64 cm; extremely gravelly loam, pale brown (10YR 6/3) dry, brown (10YR 5/3) moist; moderate medium and fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; many very fine and fine and common medium roots; many fine irregular and tubular pores; 50 percent andesite gravel and 15 percent andesite cobbles; moderately acid (pH 5.6); clear wavy boundary
2R--64 cm; andesitic bedrock
TYPE LOCATION: Linn County, Oregon, about 28 km east-southeast of Sweet Home; about 650 m north and 705 m west of the southeast corner of section 32, T. 14 S., R. 4 E.; latitude 44.3151670, longitude -122.3548890, datum WGS 84 (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Dry days--less than 45 consecutive days following summer solstice
Mean annual soil temperature--5 to 8 degrees C
Thickness of umbric epipedon--25 to 50 cm (below mineral soil surface)
Depth to lithic contact--50 to 100 cm
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--0.70 to 0.90 g/cm3
*Phosphate retention--greater than 85 percent
*Ammonium oxalate extractable Al + Fe--2.0 to 4.0 percent
*15-bar water retention--30 to 70 percent (undried samples), greater than 15 percent (dried samples)
*0.02- to 2.0-mm fraction--greater than 30 percent
*Volcanic glass content in 0.02- to 2.0-mm fraction--5 to 30 percent
Particle-size control section
*Clay content--18 to 27 percent
*Total fragment content--35 to 75 percent
O horizon
*Thickness--1 to 8 cm
A horizon
*Hue--7.5YR, 10YR
*Value--2 or 3 moist, 3 to 5 dry
*Chroma--2 or 3 moist or dry
*Fine-earth texture--medial loam
*Clay content--18 to 27 percent
*Sand content--30 to 50 percent
*Total fragment content--35 to 60 percent
*Gravel content--20 to 40 percent
*Cobble content--5 to 25 percent
*Stone content--0 to 5 percent
*Thickness--18 to 34 cm
2Bw horizon
*Hue--7.5YR, 10YR
*Value--3 to 5 moist, 4 to 6 dry
*Chroma--3 or 4 moist or dry
*Clay content--18 to 27 percent
*Sand content--30 to 50 percent
*Total fragment content--45 to 75 percent
*Gravel content--20 to 50 percent
*Cobble content--15 to 40 percent
*Stone content--0 to 10 percent
*Thickness--25 to 75 cm
COMPETING SERIES:
Cadenza--greater than 150 cm deep to bedrock
Dougan--less than 18 percent clay in particle-size control section
Fernwood--volcanic ash influence throughout profile
Zygore--greater than 150 cm deep to bedrock; less than 18 percent clay in particle-size control section
GEOGRAPHIC SETTING:
Elevation--700 to 1200 m
Climate--cool, wet winters; warm, moist summers
Mean annual precipitation--1900 to 2300 mm
Mean annual air temperature--6 to 9 degrees C
Frost-free period--90 to 135 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Browder--less than 35 percent fragments in particle-size control section; greater than 150 cm deep to bedrock; on linear slopes and complex landslides
Cadenza--greater than 150 cm deep to bedrock; on linear slopes and in draws of mountain slopes
Cascadia--mesic soil temperature regime; in similar landform positions
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturation during normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high
USE AND VEGETATION:
Use--timber production, wildlife habitat, recreation
Potential natural vegetation--Douglas-fir, western hemlock, vine maple, Oregon grape, salal, red huckleberry, western swordfern
DISTRIBUTION AND EXTENT: Western Cascade Mountains in northwestern Oregon; MLRA 3; small extent
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Willamette National Forest, Linn County, Oregon; 2016; name from nearby mining claim
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Particle-size control section--zone from 30 to 64 cm
*Umbric epipedon--zone from 5 to 36 cm
*Cambic horizon--zone from 36 to 64 cm
*Depth to lithic contact--64 cm
*Andic soil properties--zone from 5 to 36 cm
*Volcanic glass--zone from 5 to 36 cm
*Depth to lithologic discontinuity--36 cm
8/2016--Layers with andic soil properties assumed to meet criteria 2 (no ash required) in the 12th edition of Keys to Soil Taxonomy. It is also assumed that enough ash is present in those layers to meet criteria 3. Additional lab data is needed to confirm the degree of ash influence.
ADDITIONAL DATA: Type location user site ID--2012OR043219
National Cooperative Soil Survey
U.S.A.