LOCATION WHYCHUS OR
Tentative Series
IRD. AGG/MPR
02/2025
WHYCHUS SERIES
Landscape--Eastern Cascade mountains
Landform--flood plains
Slope--0 to 5 percent
Parent Material--alluvium over glaciofluvial deposits
Mean annual precipitation-- 540 mm
Mean annual air temperature-- 5.5 degrees C
Depth class--very deep
Drainage class--very poorly drained
Soil moisture regime--aquic
Soil temperature regime--frigid
Soil moisture subclass--typic
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, frigid Fluvaquentic Endoaquolls
TYPICAL PEDON: Whychus fine sandy loam, forested, on a 1 percent slope at an elevation of 1002 meters. (Colors are for dry soil unless otherwise noted.)
A1--0 to 7 centimeters; fine sandy loam, dark grayish brown (10YR 4/2), black (10YR 2/1) moist; weak fine granular structure; friable, slightly sticky, slightly plastic; many very fine and fine roots ; many fine irregular pores; neutral (pH 6.9); clear smooth boundary
A2--7 to 19 centimeters; fine sandy loam, dark grayish brown (10YR 4/2), black (10YR 2/1) moist; weak fine subangular blocky structure; friable, slightly sticky, nonplastic; many very fine and common roots; many fine irregular pores; neutral (pH 7.0); clear smooth boundary
AC--19 to 49 centimeters; fine sandy loam, dark grayish brown (10YR 4/2), black (10YR 2/1) moist; structureless massive; friable, nonsticky, nonplastic; common fine and very fine and few medium roots; many fine irregular pores; 2 percent dark brown (7.5YR 3/4) masses of oxidized iron and 5 dark brown (7.5YR 3/4) masses of oxidized iron; neutral (pH 7.0); gradual smooth boundary
C--49 to 91 centimeters; fine sandy loam with lenses of sandy loam, dark grayish brown (10YR 4/2), black (10YR 2/1) moist; massive; very friable, nonsticky, nonplastic; few fine irregular pores; 5 percent dark brown (7.5YR 3/4) masses of oxidized iron; neutral (pH 7.1); abrupt smooth boundary
2C--91 to 155 centimeters; extremely cobbly sand, brown (10YR 5/3), very dark brown (10YR 2/2) moist;single grain; loose, nonsticky, nonplastic; 85 percent cobbles; neutral (pH 7.1)
TYPE LOCATION: Deschutes County, Oregon; Latitude 44.2644830, Longitude -121.5542330, datum WGS84 (coordinates determine with a GPS).
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--6 to 8 degrees C
Thickness of mollic epipedon--25 to 55 cm
Depth to redoximorphic iron concentrations--15 to 20 cm
Depth to glaciofluvial deposits--between 85 and 100 cm
Reaction--6.1 to 7.3 (slightly acid to neutral)
Particle-size control section: 25 to 100 cm
*Clay content, weighted average--1 to 10 percent
*Rock fragment content, weighted average--0 to less than 35 percent
A horizons
*Value--2 to 4
*Chroma--1 or 2
*Fine earth texture--fine sandy loam, sandy loam
*Clay--1 to 10 percent
*Sand--50 to 85 percent
*Organic matter--2 to 5 percent
*Gravel--0 to 5 percent
*Reaction--6.1 to 7.3 (slightly acid to neutral)
*Thickness--combined thickness of A horizons is 15 to 40 cm
AC horizon
*Value--2 to 4
*Chroma--1 or 2
*Fine earth texture--fine sandy loam, sandy loam
*Clay--1 to 10 percent
*Sand--50 to 85 percent
*Organic matter--1 to 2 percent
*Gravel--0 to 5 percent
*Reaction--6.6 to 7.3 (neutral)
*Thickness--thickness of AC horizon is 20 to 40 cm
C horizon
*Value--2 to 4
*Chroma--1 or 2
*Fine earth texture- fine sandy loam, sandy loam
*Clay--1 to 10 percent
*Sand--55 to 85 percent
*Organic matter--0.5 to 1 percent
*Gravel--0 to 20 percent
*Reaction--6.6 to 7.3 (neutral)
*Thickness--thickness of C horizon is 20 to 50 cm
2C horizon
*Value--2 or 3 moist, 4 or 5 dry
*Chroma--1 or 2 moist, 2 or 3 dry
*Clay--1 to 5 percnet
*Sand--85 to 99 percent
*Organic matter--0.3 to 0.5 percent
*Total rock fragment content--35 to 85 percent
*Gravel--0 to 15 percent
*Cobble--35 to 85 percent
*Reaction--6.6 to 7.3 (neutral)
*Thickness--thickness of 2C horizon is 40 to 80 cm
COMPETING SERIES:
Sedgeville--carbonates within the upper part of the profile; reaction ranges to moderately alkaline in the lower parts of the profile
GEOGRAPHIC SETTING:
Elevation--970 to 1350 meters
Slope--0 to 5 percent
Climate--cool, wet winters and warm, dry summers
Mean annual precipitation--380 to 760 mm
Mean annual air temperature--5 to 7 degrees C
Frost-free period--60 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Ermabell--occurs on stream terraces; particle size control section contains 50 to 80 percent volcanic glass
Trout Wash--occurs on stream terraces; particle size control sections contains 30 to 80 percent glass; can have greater than 35 percent fragments
Lundgren--occurs on outwash plains; particle size control section contains 50 to 80 percent volcanic glass
Wanoga--occurs on lava plains; particle size control section contains 50 to 80 percent volcanic glass
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage--very poorly drained
Saturation in normal years--seasonal endosaturation between 15 and 20 cm of the mineral soil surface in March through June; below a depth of 70 cm in July through Febuary
Flooding--rare, brief
Ponding--none, none
Saturated hydraulic conductivity (Ksat)--high to very high in all horizons
USE AND VEGETATION:
Use--watershed, wildlife habitat, recreation
Vegetation--cottonwood, sedge, alder, willow, horsetail, Neveda pea, and rushes
DISTRIBUTION AND EXTENT:
East slopes of the Cascade Mountains in central Oregon; MLRA 6; minor extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE:Bozeman, Montana
SERIES PROPOSED:
Deschutes County, Deschutes National Forest, Oregon 2023; the name comes from Whychus creek.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
*Particle-size control section--25 to 100 cm
*Mollic epipedon--0 to 49 cm
*Aquic conditions--19 to 155 cm
*Endosaturation--91 to 155 cm
*Lithologic discontinuity--91 cm
National Cooperative Soil Survey
U.S.A.