LOCATION WASHAVA OR
Tentative Series
IRD. AGG\MPR
02/2025
WASHAVA SERIES
Landscape--Eastern Cascade mountains
Landform--flood plains, depressions
Slope--0 to 2 percent
Parent Material--alluvium over outwash
Mean annual precipitation--430 mm
Mean annual air temperature--6 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, nonacid, frigid Histic Humaquepts
TYPICAL PEDON: Washava mucky peat, shrubby flood plain, on a 1 percent slope at an elevation of 1016 meters. (Colors are for moist soil unless otherwise noted.)
Oe--0 to 24 centimeters; mucky peat, black (10YR 2/1); common medium roots and few fine roots and few coarse roots; strongly acid (pH 5.5); abrupt smooth boundary
A1--24 to 62 centimeters; mucky loam, black (2.5Y 2.5/1); massive; friable, slightly sticky, nonplastic; few medium roots and few fine roots; few fine irregular pores; 2 percent subrounded gravel; neutral (pH 7.0); gradual smooth boundary
A2--62 to 117 centimeters; mucky fine sandy loam, black (10YR 2/1); massive; friable, slightly sticky, nonplastic; few fine roots; few fine irregular pores; 10 percent subrounded gravel; neutral (pH 7.1); gradual smooth boundary
Cg1--117 to 152 centimeters; sandy loam, very dark greenish gray (10Y 3/1); massive; slightly sticky, nonplastic; few fine irregular pores; 5 percent subrounded gravel; neutral (pH 7.2); abrupt smooth boundary
2Cg2--152 to 200 centimeters; very gravelly coarse sandy loam, very dark greenish gray (10Y 3/1); single grain; slightly sticky, nonplastic; 45 percent strong brown (7.5YR 4/6) masses of oxidized iron; 40 percent subrounded gravel; neutral (pH 7.2)
TYPE LOCATION: Deschutes County, Oregon; Latitude 44.3511150, Longitude -121.5521010, datum WGS84 (coordinates determine with a GPS).
RANGE IN CHARACTERISTICS:
Mean annual soil temperature-- 7 degrees C
Thickness of histic epipedon--20 to 40 cm
Depth to redox concentrations-- 150 cm
Depth to aquic conditions--surface to 25 cm throughout the year
Reaction--6.6 to 7.3 (neutral)
Particle-size control section:
*Clay content, weighted average--18 to 28 percent
*Rock fragment content, weighted average--0 to 10 percent
Oe horizon
*Non-rubbed fiber content--60 to 80 percent
*Rubbed fiber content--20 to 40 percent
*Reaction--5.1 to 6.5 (strongly acid to slightly acid)
*Thickness--20 to 40 cm
A horizons
*Hue--10YR, 2.5Y
*Value--2.5 or 2
*Fine earth texture-- loam, fine sandy loam
*Clay--10 to 18 percent
*Sand--30 to 80 percent
*Organic matter--10 to 15 percent
*Gravel--0 to 10 percent
*Reaction--6.6 to 7.3 (neutral)
*Thickness--combined thickness of A horizons is 40 to 95 cm
Cg1 horizon
*Value--2.5 to 5
*Fine earth texture-- fine sandy loam, sandy loam
*Clay--5 to 18 percent
*Sand--55 to 80 percent
*Organic matter--1 to 5 percent
*Gravel--0 to 10 percent
*Reaction--6.6 to 7.3 (neutral)
*Thickness--thickness of Cg1 horizon is 20 to 50 cm
2Cg2 horizon
*Value--2.5 to 5
*Fine earth texture--coarse sandy loam, loamy coarse sand
*Clay--2 to 10 percent
*Sand--55 to 90 percent
*Organic matter--0.25 to 1 percent
*Total Fragment Content--35 to 75 percent
*Gravel--35 to 65 percent
*Cobble--0 to 10 percent
*Reaction--6.6 to 7.3 (neutral)
*Thickness--thickness of 2Cg2 horizon is 30 to 60 cm
COMPETING SERIES:
None
GEOGRAPHIC SETTING:
Elevation--960 to 1400 meters
Slope--0 to 5 percent
Climate--cool, wet winters and warm, dry summers
Mean annual precipitation--350 to 510 cm
Mean annual air temperature--5 to 7 degrees C
Frost-free period--50 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Omahaling--occurs on similar landforms; somewhat poorly drained; volcanic ash influence in upper parts of the particle size control section
Lundgren--occurs on outwash plains; volcanic ash influence throughout the particle size control section
Wanoga--occurs on lava flows and plains; volcanic ash influence throughout the particle size control section
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage--very poorly drained
Saturation during normal years--saturation between the soil surface to 25 cm throughout the year
Flooding--rare
Ponding--none
Saturated hydraulic conductivity (Ksat) for mineral horizons--high in C horizons, high to very high in 2Cg horizons
USE AND VEGETATION:
Use--watershed, recreation, wildlife habitat
Vegetation--willow, sedges
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
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
*Particle-size control section--25 to 100 cm
*Histic epipedon--0 to 24 cm
*Hemic soil materials--0 to 24 cm
*Lithologic discontinuity--at 152 cm
*Endosaturation--14 to 200 cm
*Redox concentrations--152 to 200 cm
National Cooperative Soil Survey
U.S.A.