LOCATION HOPHMAN                 OR

Tentative Series
JRD/KLM
12/2024

HOPHMAN SERIES

Landscape--mountains, plateaus
Landform--mountain slopes, benches
Slope--0 to 70 percent
Parent material--volcanic ash over colluvium
Mean annual precipitation--610 mm
Mean annual air temperature--5 degrees C
Depth class--deep and very deep
Drainage class--moderately well drained
Soil moisture regime--xeric
Soil temperature regime--cryic
Soil moisture subclass--typic


TAXONOMIC CLASS: Ashy, glassy Humic Xeric Vitricryands

TYPICAL PEDON: Hophman ashy loamy sand - woodland, on a 5 percent slope at an elevation of 1840 m. (Colors are for moist soil unless otherwise noted.)

Oi--0 to 5 cm; slightly decomposed needles and twigs; abrupt wavy boundary

A1--5 to 20 cm; dark brown (10YR 3/3) ashy loamy sand, brown (10YR 5/3) dry; 7 percent clay; weak fine subangular blocky parting to single grain structure; very friable, loose, nonsticky, nonplastic; very few coarse roots and many very fine and fine roots throughout; many fine irregular pores; slightly acid (pH 6.1); clear smooth boundary

A2--20 to 43 cm; dark brown (10YR 3/3) ashy loamy sand, brown (10YR 5/3) dry; 7 percent clay; weak medium subangular blocky parting to single grain structure; very friable, loose, nonsticky, nonplastic; common fine roots and few coarse roots throughout; many fine irregular pores; slightly acid (pH 6.3); gradual smooth boundary

Bw1--43 to 72 cm; dark yellowish brown (10YR 3/4) ashy loamy sand, yellowish brown (10YR 5/4) dry; 8 percent clay; weak medium subangular blocky parting to single grain structure; very friable, loose, nonsticky, nonplastic; few fine roots and common coarse roots throughout; many fine irregular pores; slightly acid (pH 6.5); gradual wavy boundary.

Bw2--72 to 107 cm; olive brown (2.5Y 4/4) ashy loamy sand, light olive brown (2.5Y 5/4) dry; 6 percent clay; weak medium subangular blocky parting to single grain structure; very friable, loose, nonsticky, nonplastic; few fine and medium roots throughout; common fine irregular pores; 5 percent gravel; slightly acid (pH 6.3); clear wavy boundary

C1--107 to 125 cm; light yellowish brown (2.5Y 6/4) ashy loamy sand, pale yellow (2.5Y 7/4) dry; 6 percent clay; single grain structure; very friable, loose, nonsticky, nonplastic; few fine roots and common coarse roots throughout; common very fine irregular pores; 5 percent fine distinct yellowish brown (10YR 5/8) moist, masses of oxidized iron; slightly acid (pH 6.2); clear wavy boundary

C2--125 to 135 cm; very pale brown (10YR 7/3) ashy very fine sandy loam, very pale brown (10YR 7/3) dry; 2 percent clay; moderate thick platy structure; firm, hard, nonsticky, nonplastic; brittle; many fine and medium roots at top of horizon; few fine irregular pores; moderately acid (pH 6.0); abrupt wavy boundary

2Ab--135 to 148 cm; very dark brown (7.5YR 2.5/2) gravelly loam, brown (7.5YR 4/2) dry; 22 percent clay; moderate medium subangular blocky structure; friable, slightly hard, slightly sticky, slightly plastic; few medium and coarse roots throughout; few fine tubular and few medium irregular pores; 25 percent gravel; moderately acid (pH 5.9); abrupt wavy boundary

2Btb--148 to 177 cm; dark brown (7.5YR 3/3) very gravelly clay loam, brown (7.5YR 5/3) dry; 30 percent clay; weak fine subangular blocky structure; friable, slightly hard, slightly sticky, slightly plastic; few medium roots throughout; few fine tubular pores; 15 percent prominent clay films on rock fragments; 45 percent gravel and 40 percent cobbles; moderately acid (pH 5.9); clear wavy boundary

2Crb--177 cm; moderately weathered unconsolidated basalt

TYPE LOCATION: Wheeler County, Oregon, about 1.1 km south of East Point, off Ochoco National Forest road 2630, about 480 m NW of the junction with the 551 road; NW1/4 of the NW 1/4 of the NE 1/4 of section 14, T.13S., R.21E; latitude 44.4521110, longitude -120.1719440, WGS84 Datum (Coordinates determined with a GPS)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--1 to 5 degrees C
Soil moisture--usually moist, but are dry for 45 to 60 days
Mollic epipedon--15 to 50 cm thick
Depth to lithic contact--greater than 100 cm

Estimated properties of layers with andic soil properties
*Andic Soil Properties--upper boundary at mineral soil surface, 100 to 150 cm thick
*P Retention--40 to 70 percent
*Acid oxalate Al + 1/2Fe--0.4 to 2.0 percent
*Volcanic glass content in 0.2 to 2.0 mm fraction--30 to 50 percent
*Water content at 1500kPa (air dry)--10 to 12 percent

Particle Size Control Section (upper 100cm below mineral soil surface)
*Clay content--5 to 15 percent
*Total rock fragments (weighted average)--0 to 20 percent

A horizons
*Hue--10YR moist or dry
*Value--3 to 5 dry, 2 to 3 moist
*Chroma--2 or 3 moist or dry
*Fine earth texture--loamy sand, sandy loam
*Clay content--5 to 15 percent
*Sand content--55 to 85 percent
*Organic matter content--1 to 4 percent
*Total rock fragments--0 to 15 percent
*Gravel content--0 to 15 percent
*Cobble content--0 to 10 percent
*Reaction--moderately to slightly acid
*Thickness--40 to 80 cm

Bw horizons
*Hue--2.5Y or 10YR moist or dry
*Value--3 to 5 dry, 2 to 3 moist
*Chroma--3 or 4 moist or dry
*Fine earth texture--loamy sand, sandy loam
*Clay content--5 to 20 percent
*Sand content--55 to 85 percent
*Organic matter content--0.5 to 1
*Total rock fragments--0 to 20 percent
*Gravel content--0 to 20 percent
*Cobble content--0 to 10 percent
*Reaction--moderately to slightly acid
*Thickness--20 to 80 cm

C horizons
*Hue--2.5Y or 10YR moist or dry
*Value--6 to 7 dry, 5 to 7 moist
*Chroma--2 to 4 moist or dry
*Fine earth texture--loamy sand, very fine sandy loam, coarse silt
*Clay content--2 to 20 percent
*Sand content--55 to 90 percent or 2 to 15 percent for coarse silt textures
*Organic matter content--0.5 to 1
*Total rock fragments--0 to 20 percent
*Gravel content--0 to 20 percent
*Cobble content--0 to 10 percent
*Reaction--moderately to slightly acid
*Thickness--10 to 50 cm

2Ab horizon
*Hue--10YR or 7.5YR moist or dry
*Value--4 to 5 dry, 2 to 3 moist
*Chroma--2 to 3 moist or dry
*Fine earth texture--loam, sandy clay loam, clay loam
*Clay content--15 to 35 percent
*Sand content--30 to 55 percent
*Organic matter content--0.5 to 2 percent
*Total rock fragments--5 to 35 percent
*Gravel content--0to 35 percent
*Cobble content--0 to 20 percent
*Stone or boulder content--0 to 10 percent
*Reaction--moderately to slightly acid
*Thickness--10 to 30 cm

2Btb horizon
*Hue--7.5YR or 10YR moist or dry
*Value-- 3 to 5 dry, 2 or 3 moist
*Chroma--3 or 4 moist or dry
*Fine earth texture--clay loam, sandy clay loam
*Clay content-20 to 40 percent
*Sand content--30 to 55 percent
*Organic matter content--0.5 to 1 percent
*Total rock fragments--25 to 85 percent
*Gravel content--15 to 60 percent
*Cobble content--10 to 60 percent
*Stone or boulder content--0 to 25 percent
*Reaction--moderately to slightly acid

COMPETING SERIES:
Cornucopiapeak--50 to 100 cm to lithic contact; lacks episaturation within 150 cm of soil surface
Cultus--contains pumice parafragments; somewhat excessively drained; lacks episaturation within 150 cm of soil surface
Shroyton--100 to 150 cm to lithic contact; contains pumice parafragments; lacks episaturation within 150 cm of soil surface

GEOGRAPHIC SETTING:
Elevation--1650 to 2150 m
Climate--cold, wet winters and cool, dry summers
Mean annual precipitation--500 to 910 mm
Mean annual air temperature--2 to 6 degrees C
Frost-free period--20 to 60 days
Lithology--volcanic ash derived from Mt Mazama over residuum and colluvium derived from Columbia River Basalts and/or tuffs and andesites associated with the Clarno Formation.

GEOGRAPHICALLY ASSOCIATED SOILS:
Chochoco--occur on mountain slopes and benches; 50 to 100 cm to lithic contact; lack organic horizon; supports rangeland vegetation
Pisgasha--occur on mountain sideslopes; have greater than 100cm of andic soil properties; moist for less than 30 days following summer solstice
Wineburger--occur on mountain slopes and benches; 40 to 80 cm of andic soil properties in surface; dry for 45 to 60 days

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage--moderately well drained
Saturation during normal years--eipisatruation between 100 and 150 cm from the soil surface during later winter and spring
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--Very High and High in the upper ashy part, moderately high in the lower part

USE AND VEGETATION:
Use--timber production, wildlife habitat, recreation
Potential native vegetation--grand fir, Douglas fir, pinegrass, strawberry
Typical plant association--CWG113 grand fir/pinegrass; Plant Associations of the Blue and Ochoco Mountains; USDA Forest Service

DISTRIBUTION AND EXTENT: Central Oregon, Ochoco Mountains (southwest Blue Mountains, MLRA 10. The soil is of small extent.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: BOZEMAN, MONTANA

SERIES PROPOSED: Ochoco National Forest, Wheeler County, Oregon, 2015;

REMARKS:
Diagnostic horizon and features recognized in this pedon are
*Mollic epipedon--5 to 43 cm
*Andic soil properties--from the mineral soil surface to 135 cm
*Episaturation--107 to 125 cm; perched water during late winter and spring. Water is perched above a layer of laminar coarse silt or very fine sandy loam material that marks the boundary between Mazama ash and the buried surface horizon. This layer may be hard and brittle but is not root restrictive.
*Argillic horizon--148 to 177 cm

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National Cooperative Soil Survey
U.S.A.