LOCATION BOLDRIN                 AK

Established Series
Rev. MHC/DLM
02/2022

BOLDRIN SERIES

Depth class: shallow to moderately deep to permafrost
Drainage class: very poorly drained
Landforms: footslopes on mountains, toeslopes on mountains
Parent material: loamy and/or gravelly colluvium
Elevation: 380 to 1391 feet
Slope: 0 to 15 percent
Annual precipitation: 22 to 29 inches
Annual temperature: 23 to 25 degrees F
Frost-free period: 60 to 90 days

TAXONOMIC CLASS:

TYPICAL PEDON: Boldrin peat - on a slope of 5 percent sedge/moss herbaceous. (All colors are for moist soil)

Oi--0 to 2 inches; dark reddish brown (5YR 3/3) slightly decomposed plant material; many very fine and fine and common medium roots; moderately acid (pH 6.0); abrupt wavy boundary.

Oe--2 to 8 inches; very dark brown (7.5YR 2.5/3) mucky peat; many very fine and fine and common medium roots; moderately acid (pH 6.0); clear wavy boundary.

Oa--8 to 15 inches; dark brown (7.5YR 3/3) muck; many very fine and fine and few medium roots; slightly acid (6.1); abrupt wavy boundary.

Cg--15 to 30 inches; dark gray (5Y 4/1) gravelly loam; friable, nonsticky and nonplastic; 20 percent gravel; slightly acid (pH 6.4); clear wavy boundary.

Cgf--30 to 60 inches; dark gray (5Y 4/1) permanently frozen gravelly loam; 20 percent gravel; slightly acid (pH 6.4).

TYPE LOCATION: Steward River Training Site, Alaska; UTM north 7187022 and UTM east 476342, zone 3.

RANGE IN CHARACTERISTICS:

Soil moisture class: aquic
Mean annual soil temperature: about 30 degrees F.
Mean summer soil temperature: about 35 degrees F.
Depth to permafrost: 17 to 31 inches

Oi, Oe, and Oa horizons:
Hue: 2.5YR to 10YR
Value: 2 to 3
Chroma: 1 to 4
Texture: peat, mucky peat, muck
Organic matter content: 65 to 90 percent
Reaction: extremely acid to neutral

Cg horizon:
Hue: 2.5Y or 5Y
Value: 4 or 5
Chroma: 1 or 2
Texture: gravelly loam, gravelly sandy loam, loam
Clay content: 0 to 10 percent
Silt content: 15 to 50 percent
Sand content: 30 to 75 percent
Organic matter content: 0 to 1 percent
Rock fragments: 2 to 30 percent subrounded strongly cemented gravel
Reaction: very strongly acid to neutral

Cgf horizon:
Hue: 2.5Y or 5Y
Value: 4 or 5
Chroma: 1 or 2
Texture: gravelly loam, gravelly sandy loam, loam
Clay content: 0 to 10 percent
Silt content: 15 to 50 percent
Sand content: 30 to 75 percent
Rock fragments: 2 to 30 percent subrounded strongly cemented gravel
Reaction: very strongly acid to neutral

COMPETING SERIES: These are Dirrant and Kuswash soils. Dirrant soils have visible mica. Kuswash soil a have a mean summer soil temperature greater than 36 degrees F.

GEOGRAPHIC SETTING:
Landforms: footslopes on mountains, toeslopes on mountains
Parent material: loamy and/or gravelly colluvium
Elevation: 380 to 1391 feet
Slope: 0 to 15 percent
Annual precipitation: 22 to 29 inches
Annual temperature: 23 to 25 degrees F
Frost-free period: 60 to 90 days

GEOGRAPHICALLY ASSOCIATED SOILS: These include Peluk and Sinuktuk soils. Peluk soils are somewhat poorly drained and occur on alluvial fans. Sinuktuk soils are well drained, moderately deep, and occur on mountains.

DRAINAGE AND PERMEABILITY: Very poorly drained, very high runoff. Saturated hydraulic conductivity is moderately high to high above the permafrost and verly low in the permafrost.

USE AND VEGETATION: Used for military use and wildlife habitat. Native vegetation is sedge/moss herbaceous.

DISTRIBUTION AND EXTENT: MLRA 240, Nulato Hills-Southern Seward Peninsula Highlands, Alaska. The series is of small extent.

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

SERIES ESTABLISHED: Steward River Training Site, Alaska, 2005

REMARKS: Diagnostic features and horizons recognized in this profile include:
Histic epipedon: 0 to 15 inches. (Oi, Oe, and Oa horizons)
Gleyed colors: 15 to 60 inches. (Cg and Cgf horizons)
Coarse-loamy particle size control section 10 to 40 inches below the mineral soil surface
Depth to permafrost: 30 to 60 inches. (2Cf horizon)
Temperature regime: pergelic
Moisture regime: aquic.

ADDITIONAL DATA:

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National Cooperative Soil Survey
U.S.A.