LOCATION INGRAMPOINT OR
Tentative Series
Rev. RAW/JRD/MPR
02/2025
INGRAMPOINT SERIES
Landscape--mountains
Landform--mountain slopes, complex landslides
Slope--0 to 60 percent
Parent material--thick mantle of volcanic ash over residuum and colluvium derived from tuff, rhyolite, andesite or basalt
Mean annual precipitation--760 mm
Mean annual air temperature--6 degrees C
Depth class--moderately deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--frigid
Soil moisture subclass--typic
TAXONOMIC CLASS: Ashy over clayey-skeletal, amorphic over smectitic, frigid Alfic Udivitrands
TYPICAL PEDON: Ingrampoint ashy sandy loam - woodland, on a 33 percent convex northwest-facing slope at an elevation of 1555 m
Oe--0 to 5 cm; decomposed duff, needles, twigs and grass litter
A--5 to 15 cm; dark brown (7.5YR 3/3) ashy sandy loam, brown (10YR 5/3) dry; weak fine subangular blocky structure parting to weak very fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine and fine roots; many very fine interstitial pores; slightly acid (pH 6.5); clear wavy boundary
Bw1--15 to 36 cm; dark brown (7.5YR 3/4) ashy sandy loam, light brown (7.5YR 6/3) dry; weak medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine and fine roots; common fine interstitial pores; slightly acid (pH 6.5); abrupt wavy boundary
Bw2--36 to 48 cm; dark brown (7.5YR 3/4) very gravelly ashy sandy loam, brown (7.5YR 5/3) dry; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and nonplastic; common very fine, few fine and medium roots; common very fine, few fine interstitial pores; 30 percent gravel; 5 percent cobbles; slightly acid (pH 6.5); clear wavy boundary
2Btb--48 to 99 cm; reddish brown (5YR 4/4) very gravelly clay, brown (7.5YR 4/4) dry; strong medium subangular blocky structure; hard, very firm, moderately sticky and very plastic; few very fine and fine roots; few very fine and common fine irregular pores; common prominent thick clay films on faces of peds; 45 percent gravel; 10 percent cobbles; slightly acid (pH 6.5); abrupt wavy boundary
2R--99 cm; weathered Clarno volcanic tuff; very strongly coherent
TYPE LOCATION: Crook County, Oregon, about 0.8 km northeast of Rooster Rock on forest road 2745-020 (1.17 km east) in the Ochoco National Forest; about 30 meters south and 90 meters east of the northwest corner of Section 18, T. 12 S., R. 19 E.; Latitude: 44.53411194, Longitude: -120.50416667, WGS 84 datum (Coordinates determined from PLSS description)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--6 to 8 degrees C
Soil Moisture--usually moist in winter and spring, dry in the moisture control section for 20 to 40 days following the summer solstice.
Depth to lithic contact--50 to 100 cm
Thickness of argillic horizon--25 to 50 cm
Reaction--pH 6.1 to 7.3 (slightly acid to neutral)
Thickness of surface ash influenced layers--35 to 50 cm
Estimated properties of layers influenced by volcanic ash
*Ammonium oxalate extractable Al + Fe--0.6 to 1.0 percent
*8Si + 2Fe (aox)--5 to 12 percent
*8Si - 2Fe (aox)--4 to 8 percent
*0.02 to 2.0 mm fraction--40 to 70 percent
*Volcanic glass in the 0.02 to 2.0 mm fraction--60 to 90 percent
*15-bar water content (air dried)--2 to 10 percent
*1/3-bar bulk density--0.65 to 1.0 g/cc
*Phosphate retention--40 to 70 percent
Particle Size Control Section (upper part, ashy):
*Clay--5 to 15 percent
*Weighted average clay--2 to 8 percent
*Total fragments--0 to 15 percent
Particle Size Control Section (lower part, clayey-skeletal):
*Clay--35 to 50 percent
*Weighted average clay--35 to 55 percent
*Total fragments--35 to 50 percent
Oe horizon (Or Oi horizon)
*Thickness--0 to 5 cm
A horizon
*Hue--10YR, 7.5YR
*Value--2 to 4 moist, 5 to 6 dry
*Chroma--3 or 4 moist or dry
*Fine earth texture--ashy loamy sand, ashy sandy loam, ashy loam
*Clay--2 to 16 percent
*Sand--45 to 80 percent
*Total fragments--0 to 10 percent
*Gravels--0 to 10 percent
*Organic matter--2.0 to 6.0 percent
*Reaction--pH 5.6 to 6.5 (moderately to slightly acid)
*Thickness--8 to 13 cm
Bw1 horizon
*Hue--10YR, 7.5YR
*Value--2 to 4 moist, 5 to 7 dry
*Chroma--3 or 4 moist or dry
*Fine earth texture--ashy loamy sand, ashy sandy loam, ashy loam
*Clay--5 to 16 percent
*Sand--45 to 80 percent
*Total fragments--0 to 10 percent
*Gravels--0 to 10 percent
*Organic matter--1.0 to 3.5 percent
*Reaction--pH 5.6 to 6.5 (moderately to slightly acid)
*Thickness--18 to 25 cm
Bw2 horizon
*Hue--10YR, 7.5YR
*Value--3 or 4 moist, 5 to 7 dry
*Chroma--3 or 4 moist or dry
*Fine earth texture--ashy loamy sand, ashy sandy loam, ashy loam, ashy fine sandy loam
*Clay--5 to 16 percent
*Sand--45 to 80 percent
*Total fragments--10 to 35 percent
*Gravels--5 to 30 percent
*Cobbles--0 to 20 percent
*Organic matter--0.5 to 2.0 percent
*Reaction--pH 5.6 to 6.5 (moderately to slightly acid)
*Thickness--8 to 20 cm
2Bt horizon
*Hue--10YR, 7.5YR, 5YR
*Value--4 or 5 moist, 5 or 6 dry
*Chroma--3 or 4 moist or dry
*Fine earth texture--sandy clay, clay
*Clay--35 to 60 percent
*Sand--30 to 60 percent
*Total fragments--40 to 60 percent
*Gravels--30 to 45 percent
*Cobbles--10 to 15 percent
*Organic matter--0.0 to 1.0 percent
*Reaction--pH 5.6 to 7.3 (moderately acid to neutral)
COMPETING SERIES:
Btree--50 to 100 cm to lithic contact; surface ash averages less than 45 percent sand
Terraverde--greater than 100 cm to lithic contact
GEOGRAPHIC SETTING:
Elevation--1130 to 1700 m
Climate--cool, wet winters and warm, moist summers
Mean annual precipitation--610 to 920 mm
Mean annual air temperature--4 to 6 degrees C
Frost-free period--40 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Terraverde--occur on north facing mountain slopes; greater than 150 cm to lithic contact
Jackalope--occur on north facing mountain slopes, benches, and ridges; greater than 100 cm to lithic contact; averages less than 35 percent clay in lower part of particle size control section
Crosswhite--occur on mountain slopes; 50 to 100 cm to lithic contact; dry 45 to 60 days following summer solstice; averages less than 35 percent clay in lower part of particle size control section
Normauk-- occur on mountain slopes; greater than 150 cm to lithic contact to lithic contact; dry 45 to 60 days following summer solstice
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage--well drained
Saturation during normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high in ashy horizons, moderately low in clayey-skeletal horizons
USE AND VEGETATION:
Use--timber production, livestock grazing, wildlife habitat
Potential native vegetation--grand fir, western larch, Douglas-fir, ponderosa pine, big huckleberry, twinflower, smallflower miterwort, heartleaf arnica, woodland strawberry, bigleaf lupine, darkwoods violet, sidebells pyrola, pinegrass, elk sedge, Columbia brome, western fescue
Typical USFS Plant Association--CWF312 (Plant Associations of the Blue and Ochoco Mountains) ABGR/LIBO2 (grand fir/twinflower)
DISTRIBUTION AND EXTENT:
Distribution--Ochoco Mountains of central Oregon
Extent--MLRA 43C; small extent.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Crook County, Oregon 1998. The name is derived from a local peak.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
*Ochric epipedon--5 to 15 cm
*Cambic horizon--15 to 36 cm (Bw1 horizon)
*Argillic horizon--48 to 99 cm (2Btb horizon)
*Andic materials--5 to 48 cm (A, Bw1 and Bw2 horizons)
*Particle-size control section--5 to 99 cm with 5 to 48 cm qualifying as andic materials and ashy, and lower part 48 to 99 cm qualifying as clayey-skeletal
National Cooperative Soil Survey
U.S.A.