LOCATION MUDLAKEBASIN OR
Established Series
IRD. RJO/DAL/KMS
02/2019
MUDLAKEBASIN SERIES
Landscape--mountains
Landform--glacial valley floors, cirque basins, mountain slopes
Slope--0 to 90 percent
Parent material--thick mantle of volcanic ash over till derived from granite
Mean annual precipitation--about 1180 mm
Mean annual air temperature--about 2 degrees C
Depth class--moderately deep to lithic contact
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Ashy over loamy-skeletal, amorphic over isotic Typic Vitricryands
TYPICAL PEDON: Mudlakebasin ashy silt loam in an area of woodland, on a 12-percent, north-facing slope at an elevation of 2192 m
Oi--0 to 1 cm; needles and twigs
A--1 to 10 cm; ashy silt loam, brown (10YR 4/3) dry, dark yellowish brown (10YR 3/4) moist; weak fine granular structure; soft, very friable, slightly sticky and slightly plastic; weakly smeary; common fine and few medium roots; few fine tubular pores; moderately acid (pH 5.7); clear wavy boundary
Bw--10 to 28 cm; ashy silt loam, yellowish brown (10YR 5/4) dry, dark yellowish brown (10YR 3/4) moist; weak fine and very fine subangular blocky structure; soft, friable, slightly sticky and slightly plastic; weakly smeary; common fine, medium, and coarse roots; common fine irregular pores; moderately acid (pH 5.7); clear wavy boundary
BC--28 to 56 cm; ashy silt loam, very pale brown (10YR 7/4) dry, yellowish brown (10YR 5/8) moist; moderate fine and medium subangular blocky structure; slightly hard, firm, slightly sticky and slightly plastic; weakly smeary; few fine and medium roots; few irregular pores; neutral (pH 7.0); abrupt wavy boundary
2Bwb--56 to 74 cm; very gravelly sandy loam, light yellowish brown (10YR 6/4) dry, dark yellowish brown (10YR 4/4) moist; weak fine subangular blocky structure parting to weak very fine subangular blocky; soft, friable, slightly sticky and nonplastic; few fine roots; few fine irregular pores; 35 percent gravel; moderately acid (pH 6.0); gradual smooth boundary
2BCb--74 to 99 cm; very gravelly sandy loam, light yellowish brown (10YR 6/4) dry, dark yellowish brown (10YR 4/4) moist; weak very fine subangular blocky structure; soft, friable, slightly sticky and nonplastic; few fine roots; few fine irregular pores; 40 percent gravel; slightly acid (pH 6.2); clear smooth boundary
2R--99 cm; granite
TYPE LOCATION: Union County, Oregon, about 599 m west and 773 m south of the northeast corner of section 11, T. 5 S., R. 42 E.; latitude 45.1443020, longitude -117.5272090, datum WGS 84 (coordinates and PLSS details estimated from point on a hard copy map)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--about 2 to 5 degrees C
Mean summer soil temperature--about 5 to 9 degrees C
Mean winter soil temperature--about -2 to 2 degrees C
Soil moisture--dry 30 to 45 days in summer
Depth to lithic contact--50 to 100 cm
Thickness of ash-influenced layers--38 to 74 cm
Estimated properties of layers influenced by volcanic ash
*Ammonium oxalate extractable Al + 1/2 Fe--1.5 to 3.0 percent
*0.02- to 2.0-mm fraction--40 to 60 percent
*Glass content in 0.02- to 2.0-mm fraction--60 to 90 percent
*1/3-bar bulk density--0.70 to 1.00 g/cm3
*Phosphate retention--60 to 90 percent
*15-bar water retention--5 to 12 percent (dried samples)
*8 x Si plus 2 x Fe--5 to 12 percent
Particle-size control section
*Clay content--4 to 18 percent throughout
*Total rock fragment content--0 to 30 percent in ashy upper part, 35 to 80 percent in loamy-skeletal lower part
*Rock fragment shape--subrounded to well rounded
A horizon
Moist color--10YR 3/3, 10YR 3/4
Dry color--10YR 4/3, 10YR 4/4, 10YR 5/3, 10YR 5/4
Fine-earth texture--ashy silt loam
Clay content--4 to 10 percent
Sand content--10 to 35 percent
Organic matter content--2 to 6 percent
Total rock fragment content--0 to 30 percent
Gravel content--0 to 20 percent
Cobble content--0 to 5 percent
Stone content--0 to 15 percent
Reaction--5.1 to 6.5
Base saturation (sum of bases)--5 to 25 percent
Thickness--8 to 20 cm
Bw horizon
Moist color--10YR 3/4, 10YR 3/6, 10YR 4/4, 10YR 4/6
Dry color--10YR 5/4, 10YR 5/6, 10YR 6/6
Fine-earth texture--ashy silt loam
Clay content--4 to 10 percent
Sand content--20 to 35 percent
Organic matter content--1 to 3 percent
Total rock fragment content--0 to 30 percent
Gravel content--0 to 25 percent
Cobble content--0 to 5 percent
Stone content--0 to 25 percent
Reaction--5.1 to 6.5
Base saturation (sum of bases)--2 to 10 percent
Thickness--18 to 53 cm
BC horizon
Moist color--10YR 5/6, 10YR 5/8
Dry color--10YR 7/4, 10YR 7/6, 10YR 8/4
Fine-earth texture--ashy silt loam
Clay content--3 to 10 percent
Sand content--20 to 35 percent
Organic matter content--0.5 to 2.5 percent
Total rock fragment content--0 to 35 percent
Gravel content--0 to 5 percent
Cobble content--0 to 10 percent
Stone content--0 to 30 percent
Reaction--6.1 to 7.3
Base saturation (sum of bases)--35 to 50 percent
Thickness--0 to 28 cm
2Bwb horizon
Moist color--7.5YR 4/4, 10YR 4/4, 10YR 5/4
Dry color--7.5YR 4/4, 10YR 4/4, 10YR 5/4
Fine-earth texture--sandy loam, loam, silt loam
Clay content--4 to 18 percent
Sand content--20 to 65 percent
Organic matter content--0.5 to 2.0 percent
Total rock fragment content--30 to 75 percent
Gravel content--15 to 35 percent
Cobble content--0 to 25 percent
Stone content--0 to 30 percent
Reaction--5.6 to 6.5
Base saturation (sum of bases)--40 to 60 percent
Thickness--8 to 41 cm
2BCb horizon
Moist color--10YR 4/4, 10YR 5/3
Dry color--2.5Y 7/2, 10YR 5/4, 10YR 6/4
Fine-earth texture--sandy loam
Clay content--6 to 18 percent
Sand content--60 to 70 percent
Organic matter content--0.3 to 1.5 percent
Total rock fragment content--35 to 60 percent
Gravel content--15 to 40 percent
Cobble content--0 to 20 percent
Stone content--0 to 20 percent
Reaction--5.6 to 6.5
Thickness--0 to 46 cm
COMPETING SERIES:
Angelpeak--100 to 150 cm or more (deep, very deep) to a lithic contact (argillite); slightly acid or neutral and 60 to 85 percent angular rock fragments in loamy-skeletal part of particle-size control section; formed in volcanic ash over colluvium derived from argillite
Ashnola--90 to 125 cm (moderately deep, deep) to a densic contact; no lithic contact within a depth of more than 150 cm; gravelly ashy sandy loam and less than 50 percent silt in ashy part of particle-size control section; formed in volcanic ash over till derived from sedimentary and volcanic rock
Bucketlake--no lithic contact within a depth of more than 150 cm; subrounded and rounded rock fragments and 5 to 15 percent clay in loamy-skeletal part of particle-size control section; formed in volcanic ash over till derived from granite
Ducklake--100 to 140 cm (deep) to a densic contact; no lithic contact within a depth of more than 150 cm; stony ashy silt loam and more than 50 percent silt in ashy part of particle-size control section; rounded or well rounded rock fragments in loamy-skeletal part of particle-size control section; formed in volcanic ash over till derived from granite
Lackeyshole--100 to 150 cm (deep) to a lithic contact (basalt); slightly acid or neutral, 35 to 55 percent subangular rock fragments, and less than 25 percent very coarse, coarse, and medium sand in loamy-skeletal part of particle-size control section; formed in volcanic ash over colluvium derived from andesitic basalt and basalt
McCalpinemeadow--65 to 90 cm (moderately deep) to a lithic contact (granite, granodiorite); subangular rock fragments, more than 25 percent very coarse, coarse, and medium sand, and 5 to 10 percent clay in loamy-skeletal part of particle-size control section; formed in volcanic ash over colluvium derived from granite and granodiorite
Mountemily--no lithic contact within a depth of more than 150 cm; subangular and angular rock fragments and 18 to 30 percent clay in loamy-skeletal part of particle-size control section; formed in volcanic ash over colluvium derived from basalt
Towermountain--60 to 100 cm (moderately deep) to a paralithic contact (rhyolitic tuff); formed in volcanic ash over colluvium derived from rhyolitic tuff
Troutmeadows--50 to 100 cm (moderately deep) to a lithic contact (basalt); subangular rock fragments, less than 25 percent very coarse, coarse, and medium sand, and 10 to 18 percent clay in loamy-skeletal part of particle-size control section; formed in volcanic ash over colluvium derived from basalt
Ufish--100 to 150 cm (deep) to a lithic contact (granitic rock); strongly acid to slightly acid, 35 to 60 percent subrounded or subangular rock fragments, and more than 25 percent very coarse, coarse, and medium sand in loamy-skeletal part of particle-size control section; formed in volcanic ash over colluvium derived from granite and granodiorite
GEOGRAPHIC SETTING:
Elevation--1550 to 2370 m
Climate--cold, moist winters; cool, moist summers
Mean annual precipitation--720 to 1790 mm
Mean annual air temperature--0 to 4 degrees C
Frost-free period--15 to 70 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Bucketlake--on planar to concave, mid to lower slopes and valley floors of glacial moraines; no lithic contact within a depth of more than 150 cm
Clarkscreek--on convex to planar, mid to lower slopes and valley floors of glacial moraines; ash mantle less than 36 cm thick
Digit--on concave to planar, glacial valley floors near stream channels; no lithic contact within a depth of more than 150 cm; less than 35 percent rock fragments in lower part of particle-size control section
Ducklake--on planar to concave, mid to lower slopes and valley floors of glacial moraines; 100 to 140 cm (deep) to a densic contact
Marblepoint--on steeper slopes of lateral moraines; ash mantle less than 36 cm thick
Moodybasin--on convex to planar mid slopes of lateral moraines; ash mantle less than 36 cm thick; 50 to 100 cm (moderately deep) to a densic contact; dry 45 to 55 days in summer
Tyeecreek--on planar to concave, mid to lower slopes of glacial moraines and glacial valley floors; argillic horizon; no lithic contact within a depth of more than 150 cm
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Saturation during normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--moderately high over high
USE AND VEGETATION:
Use--watershed, wildlife habitat, timber production, livestock grazing, recreation
Potential native vegetation--subalpine fir, Engelmann spruce, lodgepole pine, grouse huckleberry, heartleaf arnica, darkwoods violet, sidebells wintergreen, sweetcicely, Utah honeysuckle, lupine, prince's pine, Sitka valerian, sickletop lousewort, skunkleaf polemonium, western meadow-rue, big huckleberry
DISTRIBUTION AND EXTENT: Blue Mountains of northeastern Oregon; MLRA 43C; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Union County, Oregon; 2018
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Ochric epipedon
*Cambic horizon--zone from 10 to 99 cm
*Volcanic glass--zone from 1 to 56 cm
*Andic soil properties--zone from 1 to 56 cm
*Particle-size control section--zone from 1 to 99 cm
National Cooperative Soil Survey
U.S.A.