LOCATION SNAKERIVER              AK

Established Series
SAS/ABD/MPR
02/2022

SNAKERIVER SERIES

Landscape--outwash plains, drift plains, mountain valleys
Landform--organic depressions
Slope--0 percent
Parent material--organic material
Mean annual precipitation--about 900 mm
Mean annual air temperature--about 1 degree C
Depth class--very deep
Drainage class--very poorly drained
Soil moisture regime--peraquic
Soil temperature regime--cryic
Soil moisture subclass--typic

TAXONOMIC CLASS: Euic Typic Cryohemists

TYPICAL PEDON: Snakeriver peat on a flood plain, on a slope of 0 percent at an elevation of 11 m (The soil was saturated throughout the profile when described on September 10, 2007.)

Oi--0 to 40 cm; peat, dark grayish brown (10YR 4/2) dry, very dark brown (10YR 2/2) moist; many very fine, fine, medium, and coarse roots; strongly acid (pH 5.2); gradual wavy boundary

Oe1--40 to 145 cm; mucky peat, grayish brown (10YR 5/2) dry, very dark grayish brown (10YR 3/2) moist; many very fine and fine roots; strongly acid (pH 5.3); diffuse wavy boundary

Oe2--145 to 180 cm; mucky peat, grayish brown (10YR 5/2) dry, very dark grayish brown (10YR 3/2) moist; common very fine and fine roots; slightly acid (pH 6.1)

TYPE LOCATION: Bethel Census Area, Alaska, about 50 km north of the village of Togiak; latitude 59.4925000 degrees north, longitude 160.6094444 degrees west, datum WGS 84 (coordinates determined with a GPS)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--1 to 3 degrees C
Soil moisture control section--saturated in all parts during the growing season (peraquic moisture regime)
Aquic conditions--throughout the profile
Thickness of hemic soil material--92 to 160 cm

The thickness of the hemic soil material exceeds the thickness of the fibric soil material in the subsurface tier (30 to 90 cm).

Oi horizon
Hue--2.5Y, 10YR
Value--2 to 6 moist, 4 to 8 dry
Chroma--1 to 6 moist
Reaction--5.0 to 6.5
Organic matter content--60 to 100 percent
Rubbed fiber content--40 to 80 percent
Sodium pyrophosphate color value and chroma where rubbed fiber content is 40 to 75 percent--7/1, 7/2, 8/1, 8/2, 8/3
Thickness--10 to 74 cm

Oe horizon
Hue--10YR, 7.5YR
Value--2 to 3 moist, 4 or 5 dry
Chroma--1 to 3 moist
Reaction--5.0 to 6.5
Organic matter content--60 to 90 percent
Rubbed fiber content--17 to 40 percent
Thickness--more than 106 cm

COMPETING SERIES:
Grayslake--sapric soil material; soil reaction ranges from 6.6 to 7.8 in surface tier
Koyuktolik--loam or sandy loam mineral soil layer that is 20 to 45 percent coarse fragments; strata of volcanic ash in Oe horizon
Mariel--sapric soil material
Wocus--mean annual soil temperature of more than 3 degrees C

GEOGRAPHIC SETTING:
Elevation--0 to 560 m
Climate--warm, moist summers; cold, moist winters
Mean annual precipitation--580 to 2000 mm
Mean annual air temperature-- -2.5 to 1.7 degrees C
Frost-free period--80 to 140 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Ekiligamut--mineral soil material; depressions in tidal marshes
Wearyriver--no hemic soil material; similar landscape positions
Ongivinuck--thin organic surface layer; stream terraces

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--very poorly drained
Flooding--none, rare, occasional; brief
Ponding--frequent, occasional; long, very long
Saturation in normal years--at the surface during all months
Saturated hydraulic conductivity (Ksat)--moderately high or high throughout the profile

USE AND VEGETATION:
Use--wildlife habitat, recreation, subsistence
Potential natural vegetation--bog rosemary, dwarf birch, water sedge, looseflower alpine sedge, round sundew, black crowberry, marsh Labrador tea, sweetgale, cloudberry, sphagnum mosses, bulrushes, bog blueberry, tealeaf willow, bluejoint grass, Lyngbye's sedge, purple marshlocks, water horsetail

DISTRIBUTION AND EXTENT: Southwest Alaska; MLRAs 236 and 237; moderate extent

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA

SERIES ESTABLISHED: Togiak National Wildlife Refuge-Ahklun Mountains Area, Dillingham Census Area, Alaska, 2019

REMARKS:
Diagnostic horizons and other features in this pedon
*Control section--zone from 0 to 130 cm
*Surface tier--zone from 0 to 30 cm
*Subsurface tier--zone from 30 to 90 cm
*Bottom tier--zone from 90 to 130 cm
*Hemic soil material--zone from 40 to 180 cm
*Aquic condition--zone from 0 to 180 cm

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National Cooperative Soil Survey
U.S.A.