LOCATION HUNGRYHOLLOW            AK

Established Series
SDB/MJS
08/2025

HUNGRYHOLLOW SERIES

Depth class: moderately deep to permafrost
Drainage class: poorly drained
Parent material: organic material over silty loess
Landscape: mountains
Landform: depressions on interior valleys
Slope: 0 to 8 percent
Mean annual precipitation: about 600 mm (24 in)
Mean annual air temperature: about -3 degrees C (27 degrees F)
Frost-free period: 36 to 71 days

TAXONOMIC CLASS: Loamy, mixed, euic, subgelic Terric Sapristels

TYPICAL PEDON: Hungry hollow mucky peat in a sphagnum and cotton grass community on linear, linear hillside depression, on a 3 percent slope at an elevation of 810m (2660 ft).

Oi--0 to 14 cm (0.0 to 6 in); peat, dark brown (7.5YR 3/3) rubbed moist; nonsticky, nonplastic; many very fine and fine, and common medium roots throughout; low-continuity interstitial pores; very strongly acid (pH 4.8); clear smooth boundary

Oe--14 to 24 cm (6 to 9 in); mucky peat, very dark brown (7.5YR 2.5/2) rubbed moist; nonsticky, nonplastic; many very fine and fine, and common medium roots; low-continuity interstitial pores; very strongly acid (pH 4.9); clear smooth boundary

Oa--24 to 59 cm (9 to 23 in); muck, black (7.5YR 2.5/1) rubbed moist; nonsticky, nonplastic; many very fine and fine, and common medium roots; low-continuity interstitial pores; very strongly acid (pH 4.7); clear smooth boundary

C--59 to 75 cm (23 to 30 in); silt loam, dark brown (10YR 3/3) broken face moist; massive; slightly hard, friable, nonsticky, nonplastic; nonsmeary; low-continuity interstitial pores; extremely acid (pH 4.2); clear smooth boundary

Cf--75 to 150 cm (30 to 59 in); silt loam, dark brown (10YR 3/3) broken face moist; massive; soft, very friable, noncoherent, nonsticky, slightly plastic; nonsmeary; low-continuity interstitial pores; strongly acid (pH 5.3).

TYPE LOCATION: North Copper River Soil Survey Area, Alaska; latitude 62.74438, longitude -143.73922, UTM 6960083.63 north and UTM 360070.67 east, zone 7, Datum WGS84.

RANGE IN CHARACTERISTICS:

Soil moisture regime: aquic
Soil temperature regime: gelic
Mean annual soil temperature: -4 to 1 degrees C. (25 to 34 degrees F)
Thickness of organic material: 52 to 73 cm (20 to 29 in)
Thickness of fibric material: 9 to 18 cm (4 to 7 inches)
Thickness of sapric soil material: 34 to 43 cm (13 to 17 inches)
Thicness of hemic soil material: 9 to 12 cm (4 to 5 in)
Depth of Aquic conditions: 0 to 59 cm (0 to 23 in)
Depth to permafrost: 65 to 90 cm (26 to 35 in)

Oi horizon:
Hue: 5YR or 7.5YR
Value: 3 to 4
Chroma: 2 to 4
Texture: peat
Organic matter: 60 to 90 percent
Reaction class: very strongly acid to strongly acid (pH 4.5 to 5.5)

Oe horizon:
Hue: 7.5YR or 10YR
Value: 2 to 3
Chroma: 1 to 2
Texture: mucky peat
Organic matter: 60 to 90 percent
Reaction class: very strongly acid to strongly acid (pH 4.5 to 5.5)

Oa horizon:
Hue: 7.5YR or 10YR
Value: 2 to 3
Chroma: 1 to 2
Texture: muck
Organic matter: 60 to 90 percent
Reaction class: very strongly acid (pH 4.5 to 5.0)

C horizon:
Hue: 10YR or 2.5Y
Value: 3 to 4
Chroma: 2 to 3
Texture: silt loam
Sand: 22 to 40 percent
Silt: 54 to 73 percent
Clay: 5 to 12 percent
Rock fragments: 0 percent
Organic matter: 0.3 to 0.8 percent
Reaction class: extremely acid to very strongly acid (pH 3.5 to 4.6)

Cf horizon:
Hue: 10YR or 2.5Y
Value: 3 to 5
Chroma: 1 to 3
Texture: silt loam
Sand: 22 to 40 percent
Silt: 54 to 73 percent
Clay: 5 to 12 percent
Rock fragments: 0 percent
Organic matter: 0 to 4 percent
Reaction class: very strongly acid to strongly acid (pH 4.5 to 5.5)

COMPETING SERIES: These are Dodger (AK), Igruk (AK), and Ugruk (AK) series.
Igruk and Ugruk have cryoturbated layers.
Dodger soils have a silty clay loam texture in the mineral horizons.

GEOGRAPHIC SETTING:
Elevation: 400 to 1200 meters (1310 to 3935 ft)
Parent material: organic material over silty loess
Landform: depressions on interior valleys
Slopes: 0 to 8 percent
Mean annual precipitation: 400 to 800 mm (16 to 31 in)
Mean annual air temperature: -4 to -2 degrees C. (25 to 28 degrees F)
Frost-free period: 36 to 71 days

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Aello, Fields, Ironcreek, Nathlie, Tok, and Tsina soils.
Aello soils are poorly drained, lack a mineral contact within 70 cm of the soil surface, and occur on depressions in till plains.
Fields soils are well drained, lack permafrost, have an umbric epipedon, have a lithic contact within 2 m (79 in) of the soil surface, and occur on mountains.
Ironcreek soils are well drained, lack permafrost, and occur on river valleys and flood plains
Nathlie soils are poorly drained, do not have permafrost, have a histic epipedon, have a cambic horizon, and occur in river valleys terraces and lake plains.
Tok soils are well drained, have fine sandy loam cambic horizons over gravelly till, and occur on kames and glacial valley floors.
Tsina soils are well drained, do not have permafrost, and occur on mountain slopes above 800 m (2600ft) elevation.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class: poorly
Saturated Hydraulic Conductivity: high in the Oi, Oe, and Oa horizons, moderately high in the C, and low in the Cf horizon.
Permeability: moderately rapid in the Oi, Oe, and Oa horizons, moderate in the C horizon, and very slow in the Cf horizon
Runoff: negligible

USE AND VEGETATION:
Use: wildlife habitat, recreation, and subsistence
Native vegetation: Sphagnum moss, bot labrador tea, dwarf birch.

DISTRIBUTION AND EXTENT: MLRA 228 Interior Alaska mountains.
Extent: moderate

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Wasilla, Alaska

SERIES ESTABLISHED: North Copper River Soil Survey, Alaska, 2024.

REMARKS: Diagnostic features and horizons recognized in this profile include:

Particle-size control section: 59 to 89 cm (23 to 35 in)

Sapric horizon: 24 to 59 cm (9 to 23 in) (Oa horizon)

Hemic soil materials: 14 to 24 cm (6 to 9 in) (Oe horizon)

Fibric soil materials: 0 to 14 cm (0 to 6 in) (Oi horizon)

Aquic conditions: 0 to 59 cm (0 to 23 in) (Oi, Oe, Oa, and C horizons)

Permafrost: 75 to 150 cm (30 to 59 in) (Cf horizon)

ADDITIONAL DATA:

User pedon Id: 2023AK261134

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National Cooperative Soil Survey
U.S.A.