LOCATION STALEYCREEK OR
Tentative Series
IRD. DCR/MPR
02/2025
STALEYCREEK SERIES
Landscape--southwestern Middle Cascade mountains
Landform--colluvial aprons, complex landslides, glacial-valley walls, mountain slopes
Slope--0 to 55 percent
Parent material--pumice and volcanic ash over colluvium derived from volcanic rock mixed with volcanic ash
Mean annual precipitation--about 1600 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: Fine-loamy, isotic, frigid Andic Dystrudepts
TYPICAL PEDON: Staleycreek very paragravelly ashy coarse sandy loam, on a forested colluvial apron with a slope of 12 percent and an elevation of 945 m
Oi--0 to 4 cm; slightly decomposed plant material; abrupt wavy boundary
A --4 to 38 cm; very paragravelly ashy coarse sandy loam, pale brown (10YR 6/3) dry, brown (10YR 4/3) moist; weak fine granular structure; soft, very friable, nonsticky, nonplastic; many very fine and common fine through coarse roots; many very fine irregular pores; 10 percent gravel, 2 percent cobbles, and 40 percent pumice paragravel; moderately acid (pH 5.8); clear smooth boundary
2Bw1--38 to 70 cm; cobbly loam, yellowish brown (10YR 5/4) dry, dark yellowish brown (10YR 4/4) moist; weak medium subangular blocky structure; slightly hard, very friable, slightly sticky, slightly plastic; common very fine and medium and coarse and few fine roots; common very fine dendritic tubular pores; 15 percent gravel and 15 percent cobbles; moderately acid (pH 5.6); gradual smooth boundary
2Bw2--70 to 100 cm; loam, light yellowish brown (10YR 6/4) dry, dark yellowish brown (10YR 4/4) moist; weak medium subangular blocky structure; moderately hard, friable, slightly sticky, moderately plastic; common very fine roots; common very fine dendritic tubular pores; 12 percent gravel; moderately acid (pH 5.6); gradual smooth boundary
2Bw3--100 to 150 cm; gravelly loam, light yellowish brown (10YR 6/4) dry, dark yellowish brown (10YR 4/4) moist; weak medium subangular blocky structure; moderately hard, friable, slightly sticky, moderately plastic; few very fine roots; few very fine dendritic tubular pores; 20 percent gravel and 5 percent cobbles; strongly acid (pH 5.4)
TYPE LOCATION: Douglas County, Oregon, about 22 km southwest of Diamond Peak, in Willamette National Forest; 370 m south and 550 m west of the northeast corner of section 17, T. 25 S., R. 4 E., Willamette Meridian; latitude 43.40448, longitude -122.35697, datum WGS 84 (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--6 to 8 degrees C
Thickness of andic soil properties--18 to 36 cm
Reaction--pH 5.1 to 6.0
Depth to lithologic discontinuity--18 to 36 cm below the mineral soil surface
Estimated properties of layers influenced by volcanic ash
*1/3-bar bulk density--0.6 to 0.9 g/cm3
*Phosphate retention--50 to 85 percent
*Ammonium oxalate Al plus 1/2 Fe--1 to 2 percent
*1500 kPa water (air-dried samples)-greater than 12 percent
*1500 kPa water (undried)--greater than 30 percent
Particle-size control section (weighted average)
*Clay content--18 to 27 percent
*Rock fragments--5 to 35 percent
O horizon
*Composition--slightly decomposed plant material
*Thickness--0 to 8 cm
A horizon
*Value-3 or 4 moist, 5 or 6 dry
*Chroma--2 or 3 moist and dry
*Clay content--5 to 12 percent
*Sand content--55 to 75 percent
*Total fragment content--15 to 60 percent
*Pumice paragravel content--15 to 60 percent
*Gravel content--0 to 15 percent
*Cobble content--0 to 5 percent
*Volcanic glass content in 0.02 to 2.0 mm fraction--60 to 90 percent
*Thickness--18 to 36 cm
2Bw horizons
*Value--4 or 5 moist, 5 or 6 dry
*Chroma--3 or 4 moist or dry
*Clay content--18 to 27 percent
*Sand content--30 to 50 percent
*Total fragment content--5 to 50 percent
*Gravel content--5 to 50 percent
*Cobble content--0 to 20 percent
*Stone content--0 to 5 percent
*Volcanic glass content in 0.02-to 2.0-mm fraction--5 to 20 percent
COMPETING SERIES:
Fiverivers--50 to 100 cm to paralithic contact
Memaloose--50 to 100 cm to paralithic contact
Grassmountain--contains less than 5 percent volcanic glass in the 0.02-to 2.0-mm fraction
Leopold--50 to 100 cm to lithic contact
GEOGRAPHIC SETTING:
Elevation--910 to 1525 m
Climate--cool, wet winters; warm, dry summers
Mean annual precipitation--1400 to 1800 mm
Mean annual air temperature--5 to 7 degrees C
Frost-free period--75 to 150 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Illahee--umbric epipedon; located on mountain slopes
Littledome--redox concentrations in the zone 60 to 100 cm below the mineral soil surface; located on complex landslides
Pioneergulch--umbric epipedon, particle-size control section averages greater than 30 percent volcanic glass in the 0.02-to 2.0-mm fraction; located on moraines and colluvial aprons
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high
USE AND VEGETATION:
Use--timber production, wildlife habitat, recreation
Potential natural vegetation--Douglas-fir, sugar pine, western hemlock, grand fir, giant chinquapin, Pacific rhododendron, Cascade barberry; commonly supports a western hemlock/rhododendron-dwarf Oregon grape (CHS356) plant association (see Field Guide to the Forested Plant Associations of the Westside Central Cascades of Northwest Oregon)
DISTRIBUTION AND EXTENT: Southwestern Cascade Mountains, Oregon; MLRA 3; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Willamette National Forest, Douglas County, Oregon; 2022; name from creek near the type location.
REMARKS:
Diagnostic horizons and other features in this pedon
*Particle-size control section--zone from 29 to 104 cm
*Ochric epipedon
*Cambic horizon--38 to 150 cm
*Andic soil properties--zone from 4 to 38 cm
*Volcanic glass--zone from 4 to 150 cm
*Depth to lithologic discontinuity--38 cm
*Typical pedon ID--2020OR019866
National Cooperative Soil Survey
U.S.A.