LOCATION LAVINGER                OR

Tentative Series
IRD. AGG/KLM/MPR
02/2025

LAVINGER SERIES

Landscape--Eastern Cascade mountains
Landform--Holocene lava flows
Slope--0 to 30 percent
Parent Material--volcanic ash and colluvium over bedrock
Mean annual precipitation-- 760 mm
Mean annual air temperature-- 6 degrees C
Depth class--shallow and very shallow
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--frigid
Soil moisture subclass--typic

TAXONOMIC CLASS: Ashy-skeletal, glassy, frigid Lithic Vitrixerands

TYPICAL PEDON: Lavinger ashy loamy sand, forested, on a northeast-facing, 3 percent slope at an elevation of 1231 meters. (Colors are for dry soil unless otherwise noted.)

A1--0 to 5 centimeters; very cobbly ashy loamy sand, dark grayish brown (10YR 4/2), black (10YR 2/1) moist; weak medium granular structure; very friable, nonsticky, nonplastic; few very fine, fine, and coarse roots around fragments; many very fine irregular pores; 5 percent angular gravel and 40 percent cobbles; neutral (6.8); clear smooth boundary

A2--5 to 18 centimeters; extremely cobbly ashy loamy sand, brown (10YR 4/3), very dark grayish brown (10YR 3/2) moist; weak medium subangular blocky structure; very friable, nonsticky, nonplastic; few very fine and medium roots around fragments; many very fine irregular and many medium vesicular pores; 85 percent angular cobbles; neutral (7.0); gradual irregular boundary

2R--18 centimeters; basalt bedrock

TYPE LOCATION: Deschutes County, Oregon; Latitude 44.3076430, Longitude -121.7065280, datum WGS84 (coordinates determine with a GPS).

RANGE IN CHARACTERISTICS:
Mean annual soil temperature-- 7 degrees C
Soil moisture--usually moist in winter and spring, dry in the moisture control section for 60 to 90 days in the 4 months following the summer solstice
Thickness of ochric epipedon--10 to 25 cm
Depth to bedrock--15 to 50 cm
Reaction--6.1 to 7.3 (slightly acid to neutral)
Thickness of ash influenced layers--10 to 40 cm
Estimated properties of layers influenced by volcanic ash
*Ammonium oxalate extractable Al + Fe--0.4 to 1 percent
*1500 kPa water content (air dry)--less than 15 percent
*0.02 to 2.0 mm fraction--50 to 90 percent
*Volcanic glass in the 0.02 to 2.0 mm fraction--50 to 80 percent
*P retention--40 to 70 percent

Particle-size control section:
*Clay content, weighted average--1 to 8 percent
*Rock fragment content, weighted average--35 to 85 percent

A horizons
*Value--2 to 5
*Chroma--1 to 3
*Fine earth texture--ashy loamy sand, ashy sandy loam
*Clay--1 to 5 percent
*Sand--55 to 90 percent
*Organic matter--0.50 to 2 percent
*Total rock fragment content--35 to 85 percent
*Gravel--0 to 35 percent
*Cobble--0 to 85 percent
*Stone--0 to 10 percent
*Reaction--6.1 to 7.3 (slightly acid to neutral)
*Thickness--combined thickness of A horizons between 10 to 25 cm

C horizon (where present)
*Value--2 to 8
*Chroma--2 to 8
*Fine earth texture--ashy loamy sand, ashy sandy loam
*Clay--1 to 5 percent
*Sand--55 to 90 percent
*Organic matter--0.25 to 0.50 percent
*Total rock fragment content--65 to 85 percent
*Cobble--35 to 65 percent
*Stone--35 to 85 percent
*Reaction--6.1 to 7.3 (slightly acid to neutral)
*Thickness--thickness of C horizon is 10 to 30 cm

COMPETING SERIES:
Henkle-- dry for 90 to 110 days following the summer solstice; recognizes a mollic epipedon
Pepoon--allows for less than 50 percent sand throughout (loam texture class); recognizes a mollic epipedon
Treemold--allows for less than 50 percent sand throughout (loam texture class); dry for 100 to 120 days following summer solstice
GEOGRAPHIC SETTING:
Elevation--1200 to 1525 meters
Slope--0 to 30 percent
Climate--cool, wet winters and warm, dry summers
Mean annual precipitation--510 to 1020 mm
Mean annual air temperature--5 to 7 degrees C
Frost-free period--50 to 80 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Dryache--occurs on moraines adjacent to lava flows; less than 35 percent fragments in the particle size control section; over 200 cm to a lithic contact
Denoga--occurs on similar landforms, lava plains, and mountains slopes; over 100 cm to a lithic contact
Skelwa--occurs on outwash plains; over 200 cm to a lithic contact

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage--well drained
Saturated hydraulic conductivity (Ksat)--high to very high in all horizons

USE AND VEGETATION:
Use--wildlife habitat
Vegetation--ponderosa pine, Douglas-fir, grand fir, Scouler's willow, giant chinquapin, greenleaf manzanita, snowbrush ceanothus, Davidson's penstemon, western fescue, long-stolon sedge

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--0 to 18 cm
*Ochric epipedon--0 to 18 cm
*Lithic contact--18 cm
*Andic soil properties--0 to 18 cm

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National Cooperative Soil Survey
U.S.A.