LOCATION TROUTWASH OR
Tentative Series
IRD. AGG/MPR
02/2025
TROUTWASH SERIES
Landscape: Eastern Cascade mountains
Landform: stream terraces
Slope: 0 to 5 percent
Parent Material: volcanic ash over alluvium
Mean annual precipitation: 570 mm
Mean annual air temperature: 6 degrees C
Depth class: very deep
Drainage class: moderately well drained
Soil moisture regime: xeric
Soil temperature regime: frigid
Soil moisture subclass: typic
TAXONOMIC CLASS: Sandy, mixed, frigid Vitrandic Haploxerolls
TYPICAL PEDON: Trout Wash ashy loamy sand, dry grass meadow, on a 2 percent slope at an elevation of 1176 meters. (Colors are for dry soil unless otherwise noted.)
A1--0 to 12 centimeters; ashy loamy sand, dark grayish brown (10YR 4/2), black (10YR 2/1) moist; weak fine granular structure; soft, very friable, nonsticky, nonplastic; very few fine roots; common very fine irregular pores; 5 percent gravel; neutral (pH 6.7); clear smooth boundary
A2--12 to 32 centimeters; ashy loamy sand, dark grayish brown (10YR 4/2), very dark brown (10YR 2/2) moist; weak medium subangular blocky structure; soft, very friable, nonsticky, nonplastic; many very fine and fine roots; common very fine irregular pores; 12 percent gravel; neutral (pH 6.9); abrupt smooth boundary
2A3--32 to 59 centimeters; extremely cobbly loamy sand, dark grayish brown (10YR 4/2); very dark brown (10YR 2/2) moist; weak medium granular structure; soft, very friable, nonsticky, nonplastic; few medium and fine roots; few very fine irregular pores; 20 percent gravel and 65 percent cobbles; neutral (pH 7.0); gradual smooth boundary
2AB--59 to 81 centimeters; loamy fine sand, very dark brown (10YR 2/2) moist; moderate medium subangular blocky structure; friable, nonsticky, nonplastic; few medium roots; few fine irregular pores; 5 percent gravel; neutral (pH 7.0); clear smooth boundary
2Bw--81 to 107 centimeters; loamy fine sand, very dark brown (10YR 2/2) moist; strong medium subangular blocky structure; friable, nonsticky, nonplastic; few coarse roots; few fine irregular pores; 2 percent gravel; neutral (pH 7.0); gradual smooth boundary
2C1--107 to 132 centimeters; loamy fine sand, very dark gray (2.5Y 3/1) moist; single grain; loose, nonsticky, nonplastic; few fine irregular pores; 5 percent dark reddish brown (5YR 3/4) moist masses of oxidized iron; 10 percent gravel; neutral (pH 7.0)
2C2--132 to 155 centimeters; gravelly loamy fine sand, black (10YR 2/1) moist; single grain; loose, nonsticky, nonplastic; few fine irregular pores; 2 percent gray (10YR 5/1) moist masses of reduced iron and 2 percent dark reddish brown (5YR 3/4) moist masses of oxidized iron; 20 percent gravel; neutral (pH 7.1)
TYPE LOCATION: Deschutes County, Oregon; latitude 44.2835980, longitude -121.6764450, datum WGS84 (coordinates determined with a GPS).
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--7 degrees C
Soil Moisture--the moisture control section is usually moist in winter and spring, dry in the moisture control section for 45 to 60 days following the summer solstice
Thickness of mollic epipedon--18 to 60 cm
Thickness of cambic horizon--15 to 30 cm
Thickness of surface ash influenced layers--18 to 35 cm
Depth to aquic conditions--100 to 150 cm
Reaction--ph 6.6 to 7.3 ( neutral)
Estimated properties of layers influenced by volcanic ash
*Ammonium oxalate extractable Al + Fe--0.4 to 1.0 percent
*0.02 to 2.0 mm fraction--50 to 90 percent
*Volcanic glass in the 0.02 to 2.0 mm fraction--30 to 80 percent
*P retention--40 to 70 percent
*1500 kPa water retention--less than 15 percent
Particle-size control section (weighted average): 25 to 100 cm
*Clay content--1 to 15 percent
*Rock fragment content--35 to 85 percent
A1 horizon
*Value--2 to 4 dry, 1 or 2 moist
*Chroma--1 or 2
*Sand--70 to 90 percent
*Clay--1 to 15 percent
*Organic matter--1 to 3 percent
*Gravel--0 to 10 percent
*Reaction--pH 6.6 to 7.3 (neutral)
*Thickness--thickness of A1 horizon is 10 to 20 cm
A2 horizon
*Value--2 to 4 dry, 1 or 2 moist
*Chroma--1 or 2
*Sand--70 to 90 percent
*Clay--1 to 15 percent
*Organic matter--1 to 2 percent
*Gravel--0 to 15 percent
*Reaction--pH 6.6 to 7.3 (neutral)
*Thickness--thickness of A2 horizon is 10 to 30 cm
2A3 horizon
*Value--2 to 4 dry, 1 or 2 moist
*Chroma--1 or 2
*Fine earth texture--loamy sand, loamy coarse sand, loamy fine sand
*Sand--70 to 90 percent
*Clay--1 to 15 percent
*Organic matter--0.50 to 1.5 percent
*Total rock fragment content--50 to 85 percent
*Gravel--15 to 65 percent
*Cobbles--35 to 65 percent
*Reaction--pH 6.6 to 7.3 (neutral)
*Thickness--thickness of 2A3 horizon is 20 to 40 cm
2AB horizon
*Value--2 to 5 dry, 1 to 3 moist
*Chroma--2 or 3
*Fine earth texture--loamy sand, loamy coarse sand, loamy fine sand
*Sand--70 to 90 percent
*Clay--1 to 15 percent
*Organic matter--0.50 to 1 percent
*Total rock fragment content--0 to 85 percent
*Gravel--0 to 75 percent
*Cobble--0 to 75 percent
*Reaction--pH 6.6 to 7.3 (neutral)
*Thickness--thickness of 2AB horizon is 15 to 30 cm
2Bw horizon
*Value--2 to 5 dry, 1 to 3 moist
*Chroma--2 or 3
*Fine earth texture--loamy sand, loamy coarse sand, loamy fine sand
*Sand--70 to 90 percent
*Clay--1 to 15 percent
*Organic matter--0.25 to 0.50 percent
*Gravel--0 to 65 percent
*Reaction--pH 6.6 to 7.3 (neutral)
*Thickness--thickness of 2Bw horizon is 20 to 40 cm
2C1 horizon
*Hue--2.5Y, 10YR
*Value--2.5 to 5
*Chroma--1 to 4
*Fine earth texture--loamy sand, loamy coarse sand, loamy fine sand
*Sand--70 to 90 percent
*Clay--1 to 15 percent
*Organic matter--0.25 to 0.50 percent
*Gravel--0 to 65 percent
*Reaction--pH 6.6 to 7.3 (neutral)
*Thickness--thickness of 2C1 horizon is 20 to 40 cm
2C2 horizon
*Hue--10YR
*Value--2 to 5 dry, 1 to 3 moist
*Chroma--2 or 3
*Fine earth texture--loamy sand, loamy coarse sand, loamy fine sand
*Sand--70 to 90 percent
*Clay--1 to 15 percent
*Organic matter--0.25 to 0.40 percent
*Total rock fragment content--0 to 65 percent
*Gravel--0 to 65 percent
*Reaction-- pH 6.6 to 7.3 (neutral)
*Thickness--thickness of 2C2 horizon is 15 to 30 cm
COMPETING SERIES:
None
GEOGRAPHIC SETTING:
Elevation--975 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:
Whychus--occurs on adjacent floodplains; aquic conditions within 50 cm of the mineral soil surface
Ermabell--occurs on stream terraces; ash influence throughout the particle size control section;dry for 90 or more days following the summer solstice
Skelwa--occurs on nearby outwash plains
Lundgren--occurs on nearby outwash plains; greater than 90 dry days following the summer solstice
Denoga--occurs on nearby lava plains; lithic contact between 100 and 200 cm
Wanoga--occurs on nearby lava plains; paralithic or lithic contact between 50 and 100 cm; greater than 90 dry days following the summer solstice
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage--moderately well drained
Saturation during normal years--endosaturation occuring below 100 cm during spring and/or early summer months
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high in ashy horizons, very high in lower horizons
USE AND VEGETATION:
Use--watershed, wildlife habitat
Vegetation--Ponderosa pine, white fir, grand fir, Douglas-fir, Kentucky bluegrass, compact brome, Idaho fescue, American vetch, and blue wildrye
DISTRIBUTION AND EXTENT:
Eastern 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 is derived from the nearby Trout Creek Butte.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
*Particle-size control section--25 to 100 cm
*Andic soil properties--0 to 32 cm
*Mollic epipedon--0 to 59 cm
*Lithologic discontinuity--around 32 cm
*Cambic horizon--81 to 107 cm
*Redox concentrations--107 to 132 cm
*Aquic conditions--107 to 155 cm
*Endosaturation--around 132 cm
*Redox depletions with chroma 2 or less--132 to 155 cm
Laboratory data for the ash mantle is from lab pedon number 86P0947 (Ermabell series) and 86P0948 (Lundgren series) in Deschutes County, Oregon. This data is available from the NRCS-NSSC-Kellogg Soil Survey Laboratory, Lincoln, Nebraska.
The volcanic ash deposit is from the eruption of Mt. Mazama (7.7 kya).
National Cooperative Soil Survey
U.S.A.