LOCATION OLDWOMANRIVER AK
Established Series
SAS/MPS
05/2022
OLDWOMANRIVER SERIES
Landscape--valley
Landform--floodplains
Slope--0 to 4 percent
Parent material--stratified coarse-loamy alluvium over sandy and gravelly alluvium
Mean annual precipitation--about 450 mm
Mean annual air temperature--about -3 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Coarse-loamy over sandy or sandy-skeletal, mixed, superactive Fluventic Haplocryepts
TYPICAL PEDON: Oldwomanriver silt linear, linear floodplain on a slope of 0.5 percent at an elevation of 65 m (The soil was moist throughout when described on June 22, 2016.)
Oe--0 to 5 cm; moderately decomposed plant material, dark gray (10YR 4/1) dry, black (10YR 2/1) moist; nonsticky, nonplastic; many very fine and common fine, medium, and coarse roots; slightly acid (pH 6.4); abrupt smooth boundary
C/A--5 to 14 cm; stratified silt, 60 percent grayish brown (10YR 5/2) and 40 percent dark grayish brown (10YR 4/2) dry, 60 percent very dark grayish brown (10YR 3/2) and 40 percent very dark brown (10YR 2/2) moist; weak medium granular structure; very friable, nonsticky, nonplastic; common very fine, fine, medium, and coarse roots; moderately acid (pH 6.0); clear smooth boundary
Bw--14 to 35 cm; stratified silt loam, very fine sandy loam, grayish brown (10YR5/2) dry and very dark grayish brown(10YR 3/2) moist; weak medium subangular blocky structure; friable, nonsticky, nonplastic; common very fine, fine, medium, and coarse roots; common fine irregular pores; 2 percent fine lenticular dark brown (10YR 3/3) moist masses of oxidized iron with clear boundaries lining pores; moderately acid (pH 6.0); clear smooth boundary
C1--35 to 68 cm; stratified fine sandy loam, silt loam, grayish brown (2.5Y 5/2) dry, very dark grayish brown (2.5Y 3/2) moist; massive; friable, nonsticky, nonplastic; common very fine, fine, medium, and coarse roots; 1 percent fine irregular dark yellowish brown (10YR 3/4) moist masses of oxidized iron with diffuse boundaries in matrix and 2 percent fine irregular dark gray (2.5Y 4/1) mottles lining pores; slightly acid (pH 6.3)
2C2--68 to 150 cm; very gravelly sand, variegated; single grain; loose, nonsticky, nonplastic; 50 percent gravel; slightly acid (pH 6.1)
TYPE LOCATION: Yukon-Koyukuk Census Area, Alaska, latitude 62.9697670 longitude -160.7108170 degrees, datum WGS84 (Coordinates determined with a GPS unit)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--0 to 3 degrees C
Soil moisture control section--dry less than 45 consecutive days in June through October
Ochric epipedon--10 to 20 cm
Depth to redoximorphic iron concentrations--14 to 50 cm
Loamy portion of the particle size control section:
*Clay--5 to 12 percent
Sandy portion of the particle size control section:
*Clay--0 to 6 percent
*Total fragments--50 to 70 percent gravel
Oe horizon
Thickness--2 to 10 cm
C/A horizon
Hue--10YR or 2.5Y
Value--2 to 3 moist, 4 or 5 dry
Chroma--1 to 3
Fine-earth texture--silt, silt loam, very fine sandy loam
Clay--2 to 10 percent
Sand--10 to 60 percent
Organic carbon--5 to 8 percent
Reaction--5.6 to 6.5
Thickness-- 5 to 20 cm
Bw horizon
Hue--10YR or 2.5Y
Value--3 or 4 moist, 5 or 6 dry
Chroma--2 or 3
Fine-earth texture--silt loam, fine sandy loam
Clay--2 to 10 percent
Sand--20 to 65 percent
Organic carbon--3 to 5 percent
Reaction--5.8 to 6.6
Thickness--10 to 35 cm
C1 horizon
Hue--10YR or 2.5Y
Value--2 to 3 moist, 4 or 5 dry
Chroma--2 or 3
Fine-earth texture--fine sandy loam, silt loam
Clay--2 to 10 percent
Sand--35 to 70 percent
Organic carbon--1 to 2 percent
Reaction--5.8 to 6.8
Thickness--25 to 40 cm
2C2 horizon
Hue--10YR or 2.5Y
Value--2 to 3 moist, 4 or 5 dry
Chroma--1 to 3
Fine-earth texture--loamy sand, sand
Clay--0 to 5 percent
Sand--80 to 98 percent
Organic carbon--0.1 to 0.3 percent
Total rock fragment content--40 to 70 percent gravel
Reaction--6.0 to 6.9
COMPETING SERIES:
Moosehead--does not flood, buried A horizons, value ranges to 5 and chroma ranges to 6 in Bw horizons; cobbles present in 2C horizons, mean annual soil temperature ranges from 3 to 28 degrees F ; terraces and alluvial fans
GEOGRAPHIC SETTING:
*Elevation--0 to 500 m
*Climate--warm, moist summers; cold, dry winters
*Mean annual precipitation--310 to 570 mm
*Mean annual air temperature-- -5 to -1 degrees C
*Frost-free period--55 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS:
*
Sprucecreek--folistic epipedon, cambic horizon, loess over sandy alluvium, terraces in valleys
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
*Drainage class--well drained
*Flooding--occasional, brief
*Saturation during normal years--saturated for less than 2 weeks in June in the C1 horizon, directly above the lithologic discontinuity
*Saturated hydraulic conductivity (Ksat)--very high in the surface organic layer and the sandy and gravelly substratum, high to moderately high throughout the rest of the profile
USE AND VEGETATION:
Use--wildlife habitat, recreation, subsistence
Potential native vegetation-- thinleaf alder, bluejoint, fireweed, filed horsetail, tall bluebells, balsam poplar, prickly rose, squashberry, northern bedstraw, forb, spreading woodfern, white spruce, feltleaf willow
DISTRIBUTION AND EXTENT: Yukon-Kuskokwim Highlands, Alaska; MLRA 230; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA
SERIES ESTABLISHED: Nulato Hills BLM area, Nome Census Area, Alaska; 2021
REMARKS:
Diagnostic horizons and features recognized in this pedon
*Particle-size control section--zone from 30 to 105 cm
*Ochric epipedon--zone from 0 to 14 cm
*Cambic horizon--zone from 14 to 35 cm
*Redoximorphic concentrations--zone from 14 to 68 cm
*Lithologic discontinuity--zone from 68 to 150 cm
National Cooperative Soil Survey
U.S.A.