LOCATION WICKIUP                 OR

Established Series
Rev. RPM/TDT/CEG
02/2025

WICKIUP SERIES

Landscape--Pumice mantled plateau
Landform--open depressions and swales on pumice mantled stream terraces
Slope--0 to 3 percent
Parent material--gravel-size pumice and ash, with a thin mantle of
alluvium derived from diatomaceous sediments in some areas
Mean annual precipitation--about 510 mm
Mean annual air temperature--about 5.6 degrees C
Depth class--very deep
Drainage class--poorly drained
Soil moisture regime--aquic
Soil temperature regime--cryic
Soil moisture subclass--typic

TAXONOMIC CLASS: Ashy-pumiceous, glassy, nonacid Typic Cryaquands

TYPICAL PEDON: Wickiup ashy loamy sand - woodland, on less than 1 percent slope at 1372 m elevation; when described on 8/16/90, the soil was moist throughout.

Oi--0 to 10 cm; slightly decomposed litter of lodgepole pine needles and huckleberry leaves and twigs.

A--10 to 20 cm; ashy loamy sand, light gray (10YR 7/1) dry, grayish brown (10YR 5/2) moist; few faint very dark grayish brown (10YR 3/2) redox depletions; weak medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine and few fine and medium roots; many very fine tubular pores; slightly acid (pH 6.4); clear smooth boundary.

BC1--20 to 35 cm; very paragravelly ashy coarse sand, very pale brown (10YR 7/4) dry, yellowish brown (10YR 5/6) moist; few faint very dark grayish brown (10YR 3/2) redox depletions; massive; loose, nonsticky and nonplastic; few fine roots; many very fine irregular pores; 45 percent gravel-size pumice; slightly acid (pH 6.2); gradual wavy boundary.

BC2--35 to 163 cm; extremely paragravelly ashy coarse sand, very pale brown (10YR 8/2) dry, yellowish brown (10YR 5/6) moist; many distinct yellowish brown (10YR 5/4) redox concentrations; massive; loose, nonsticky and nonplastic; many very fine irregular pores; 75 percent gravel-size pumice gravel; slightly acid (pH 6.2).

TYPE LOCATION: Klamath County, Oregon; Odell Butte, Oregon USGS quadrangle; latitude 43.4395800 degrees north, longitude 121.8328000 west, datum WGS84 (coordinates estimated from topographic map).

RANGE IN CHARACTERISTICS:

Soil Temperature: cryic regime
Mean annual soil temperature-- 4.0 to 8.0 degrees C
Mean summer soil temperature-- 6.0 to 12.0 degrees C
Mean winter soil temperature-- 2.0 to 6.0 degrees C
Moisture control section--30 to 90 cm; aquic regime; usually moist; dry less than 45 consecutive days in the four months that follow the summer solstice; aquic conditions and redox features extend to the soil surface
Rock fragments--gravel-size pumice fragments 2 to 4 cm in diameter; gravel-size volcanic rock, 2 to 75 cm in diameter; gravel-size iron-manganese nodules, 2 to 20 cm in diameter
Fine-earth fraction--vesicular ash, predominantly coarse sand-size
Depth to bedrock--greater than 150 cm

Particle-size control section
*Clay content--0 to 35 percent
*Pumice rock fragment content--35 to 85 percent

Estimated andic properties, all horizons (excluding O horizons and any thin surface horizons of diatomaceous silts):
*Ammonium oxalate extractable Al plus 1/2 Fe--0.4 to 1.0 percent
*Medium to very coarse sand in the .02 to 2.0 mm fraction--greater than 50 percent
*P-retention--25 to 60 percent
*Volcanic glass content--70 to 100 percent glass and glass-coated aggregate
*1/3-bar bulk density--0.70 to 1.00 g/cm3
*1500 kPa water (air-dried samples)--3 to 12 percent

O horizons (where present)
Fine-earth texture--slightly, moderately, or highly decomposed plant material, peat, mucky peat (from needles, leaves and twigs)
Thickness--0 to 15 cm

A horizon
Hue--10YR or 2.5YR
Value--2 to 6 moist, 5 to 8 dry
Chroma--1 or 2, moist or dry
Fine-earth texture--ashy loamy coarse sand, ashy loamy sand, diatomaceous silt loam, diatomaceous silt (may include a significant amount of diatomaceous sediments that may impart a light color and fine texture)
Redoximorphic features--faint grayish brown
Reaction--strongly acid to neutral (pH 5.1 to 7.3)
Thickness--5 to 13 cm

Bg horizon (present in some pedons)
Hue--10YR
Value--4 or 5 moist, 6 or 7 dry
Chroma--1 or 2, moist or dry
Fine-earth texture--diatomaceous silt loam, diatomaceous silt
Reaction--strongly acid to neutral (pH 5.1 to 7.3)
Thickness--0 to 11 cm


BC horizons (or Bc, 2BC, or 2Bc horizons)
Hue--10YR to 5Y
Value--4 or 6 moist, 6 to 8 dry
Chroma--1 to 6, moist or dry
Fine-earth texture--ashy coarse sand, ashy loamy coarse sand
Paragravel content--1 to 90 percent pumice paragravel
Gravel content--0 to 5 percent
Iron-Manganese nodule content--0 to 7 percent, moderately to strongly cemented, gravel-sized
Redoximorphic features--faint or distinct, grayish brown to reddish brown
Reaction--strongly acid to neutral (pH 5.1 to 7.3)

COMPETING SERIES:
Deepdish--contain spodic material; 15 to 40 cm depth to redox features and aquic conditions (somewhat poorly drained)
Kirk--mollic epipedon; medial loam surface layer 18 to 50 cm thick

GEOGRAPHIC SETTING:
Elevation--1225 to 1675 m
Climate--cold, wet winters and cool, dry summers
Mean annual air temperature-- 4.4 to 6.7 degrees C
Mean annual precipitation--450 to 920 mm, falling mostly as snow
Frost-free period--0 to 50 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Lapine--on pumice plains; excessively drained

DRAINAGE AND PERMEABILITY:
Drainage class--poorly drained
Saturation in normal years--endosaturation, below a depth of 0 to 75 cm, in March through October; below a depth of 75 cm in November through February
Flooding--none
Ponding--frequent, very long, April through June
Saturated hydraulic conductivity (Ksat)--moderately low to moderately high in surface layers of diatomaceous sediments (where present); high or very high throughout all other horizons

USE AND VEGETATION:
Use--timber production, wildlife habitat
Vegetation--lodgepole pine, bog blueberry, willow, sedges, and grasses

DISTRIBUTION AND EXTENT: Cascade Mountains, Eastern Slope, Oregon; MLRA 6; small extent

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana

SERIES ESTABLISHED: Deschutes County Oregon, 1946.

REMARKS:
Diagnostic horizons and features in the pedon
*Particle-size control section--zone from 10 to 110 cm
*Ochric epipedon
*Andic soil properties--throughout (zone from 10 to 163 cm)
*Volcanic glass--zone from 10 to 163 cm
*Redoximorphic features--zone from 10 to 163 cm

Andic soil properties--based on data from the Steiger series (pedon S87OR-035-001) and a pedon of Wickiup (S03OR-035-013); 15 bar water content is less than 12 percent throughout

Pumice and ash are from Mt. Mazama

Nasis Pedon ID 1992OR035001

1/7/2022--This official series description was updated according to SSRO1 Technical Note--Content and Format of Official Series Descriptions. Most of the changes were in formatting and in updating Range in Characteristics sections to include information on surface horizons of diatomaceous silts.

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National Cooperative Soil Survey
U.S.A.