LOCATION LONGARM                 AK

Established Series
SAS/ABD/MPR
05/2022

LONGARM SERIES

Landscape--mountain valleys
Landform--flood plains
Slope--0 to 5 percent
Parent material--alluvium
Mean annual precipitation--about 1000 mm
Mean annual air temperature--about 1 degree C
Depth class--very deep
Drainage class--poorly drained
Soil moisture regime--aquic
Soil temperature regime--cryic
Soil moisture subclass--typic

TAXONOMIC CLASS: Sandy-skeletal, mixed Typic Cryaquents

TYPICAL PEDON: Longarm gravelly silt on a linear flood plain, on a slope of 0 percent at an elevation of 128 m (When described on August 15, 2011, the soil was moist to a depth of 14 cm and saturated throughout the rest of the profile.)

Oa--0 to 14 cm; highly decomposed plant material; many very fine to coarse roots; moderately acid (pH 6.0); clear smooth boundary

Cg1--14 to 38 cm; gravelly silt, light gray (5Y 7/2) dry, olive gray (5Y 5/2) moist; massive; slightly hard, friable, nonsticky and nonplastic; many very fine to coarse roots; 15 percent medium masses of oxidized iron, strong brown (7.5YR 4/6) moist; 30 percent gravel and 4 percent cobbles; slightly acid (pH 6.3); clear smooth boundary

2Cg2--38 to 150 cm; extremely gravelly coarse sand, grayish brown (2.5Y 5/2) dry, very dark grayish brown (2.5Y 3/2) moist; single grain; loose, nonsticky and nonplastic; common very fine roots; 70 percent gravel and 15 percent cobbles; slightly acid (pH 6.5)

TYPE LOCATION: Bethel Census Area, Alaska, about 50 km north-northwest of the village of Togiak; latitude 59.4894444 degrees north, longitude 160.6613889 degrees west, datum WGS 84 (coordinates determined with a GPS)

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 (udic moisture regime)

Particle-size control section
*Clay content--0 to 5 percent
*Sand content--85 to 100 percent
*Total rock fragment content--50 to 89 percent

Oa horizon
Thickness--2 to 14 cm

Cg1 horizon
Hue--2.5Y, 5Y
Value--4 or 5 moist, 6 or 7 dry
Chroma--1 to 2 moist
Fine-earth texture--silt, silt loam, sandy loam
Clay content--3 to 10 percent
Reaction--5.5 to 6.5
Thickness--5 to 34 cm

2Cg2 horizon
Hue--5Y, 2.5Y, 10YR
Value--2 to 5 moist, 4 to 7 dry
Chroma--1 to 2 moist
Fine-earth texture--coarse sand, loamy sand, loamy coarse sand
Clay content--0 to 5 percent
Reaction--5.5 to 6.5
Total rock fragment content--50 to 89 percent
Gravel content--50 to 89 percent
Cobble content--0 to 35 percent
Thickness--more than 102 cm

COMPETING SERIES:
Anan--mean annual soil temperature greater than 3 degrees C
Eachusto--base saturation is greater than 80 percent
Jurvannah--mean annual soil temperature greater than 4 degrees C
Ustiugof--pH is greater than 6.5 in A horizons

GEOGRAPHIC SETTING:
Elevation--0 to 670 m
Climate--warm, moist summers; cold, moist winters
Mean annual precipitation--580 to 2000 mm
Mean annual air temperature-- -2.5 to 1.6 degrees C
Frost-free period--75 to 140 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Awayak--no aquic conditions; frequent flooding; similar landscape positions
Atayak--umbric epipedon; lithic contact; not subject to flooding; escarpments
Ongivinuck--umbric epipedon; andic soil properties; rare flooding; similar landscape positions

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--poorly drained
Flooding--occasional, long
Saturation in normal years--below a depth of 5 to 14 cm in May through October, below a depth of 50 to 75 cm in November through April
Saturated hydraulic conductivity (Ksat)--moderately high or high in the Cg horizon, high or very high in the 2C horizon

USE AND VEGETATION:
Use--wildlife habitat, recreation, subsistence
Potential natural vegetation--bluejoint, fireweed, field horsetail, woolly geranium, splendid feather moss, Schreber's big red stem moss, arctic raspberry, Barclay's willow, Canadian burnet, tealeaf willow

DISTRIBUTION AND EXTENT: Ahklun Mountains, Alaska; MLRA 237; moderate extent

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

SERIES ESTABLISHED: Togiak National Wildlife Refuge, Bethel Census Area, Alaska; 2019

REMARKS:
Diagnostic horizons and other features in this pedon
*Particle-size control section--zone from 39 to 114 cm
*Ochric epipedon
*Aquic conditions--Cg1 and 2Cg2 horizons horizon

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National Cooperative Soil Survey
U.S.A.