LOCATION GLENNALLEN AK
Established Series
SDB
08/2025
GLENNALLEN SERIES
Depth class: deep
Drainage class: poorly drained
Parent material: organic material over fine-silty lacustrine deposits
Landscape: lake plains and outwash plains
Landform: river valleys, lacustrine terraces, flats and bluffs
Slope: 0 to 15 percent
Mean annual precipitation: about 350 mm (14 in)
Mean annual air temperature: about -3 degrees C (27 degrees F)
Frost-free period: 20 to 110 days
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, nonacid, subgelic Typic Histoturbels
TYPICAL PEDON: Glennallen moderately decomposed organic material in a black spruce dominated community on an east facing linear, linear slope on a lacustrine terrace on a slope of 3 percent and an elevation of 632m (2075 ft)
Oi--0 to 4 cm (0 to 2 in); peat, dark yellowish brown (10YR 4/6) broken face moist; many very fine, common fine, medium, and coarse roots throughout; strongly acid (pH 5.2); abrupt smooth boundary (3 to 5 cm, 1 to 2 in)
Oe--4 to 13 cm (2 to 5 in); mucky peat, dark brown (10YR 3/3) broken face moist; common very fine, fine, and medium roots throughout; moderately acid (pH 5.7); clear smooth boundary (8 to 11 cm, 3 to 4 in)
Oa--13 to 20 cm (5 to 8 in); muck, black (10YR 2/1) broken face moist; common fine and medium roots throughout; neutral (pH 6.9); clear smooth boundary (6 to 14 cm, 2 to 6 in)
A--20 to 27 cm (8 to 11 in); gravelly silt loam, black (7.5YR 2.5/1) broken face moist; weak medium subangular blocky structure; soft, very friable, nonsticky, nonplastic; nonsmeary; common fine and medium roots throughout; 25 percent subangular gravel by volume; slightly acid (pH 6.5); clear smooth boundary. (6 to 14 cm, 2 to 6 in)
C--27 to 78 cm (11 to 31 in); gravelly clay loam, dark gray (10YR 4/1) broken face moist; massive; slightly hard, friable, moderately sticky, moderately plastic; nonsmeary; common fine roots throughout; 20 percent medium prominent irregular noncoherent cemented strong brown (7.5YR 4/6) masses of oxidized iron with clear boundaries in matrix; 25 percent subangular gravel by volume; neutral (pH 6.7); gradual smooth boundary. (9 to 52 cm, 4 to 20 in)
Cjj--78 to 125 cm (31 to 49 in); gravelly clay loam, black (2.5Y 2/1) broken face moist; massive; moderately hard, firm, moderately sticky, very plastic; nonsmeary; common very fine roots throughout; 33 percent subangular gravel by volume; neutral (pH 7.0); gradual smooth boundary. (24 to 49 cm, 9 to 19 in)
Cf--125 to 150 cm (49 to 60 in); permanently frozen silt loam, broken face moist; massive; moderately hard, firm, noncoherent, moderately sticky, very plastic; nonsmeary; 30 percent subangular gravel by volume; neutral (pH 7.3) (5 to 94 cm, 2 to 37 in)
TYPE LOCATION: North Copper River Soil Survey Area, Alaska; latitude 62.50852, longitude -145.54238, UTM 6931679.30 north, and UTM 575065.80 east, zone 6, 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: 17 to 30 cm (7 to 12 in)
Thickness of histic epipedon: 20 to 30 cm (8 to 12 in)
Aquic conditions: 0 to 125 cm (0 to 47 in)
Depth to redoximorphic concentrations: 23 to 44 cm (9 to 17 in)
Depth to cryoturbation: 32 to 96 cm (13 to 38 in)
Depth to permafrost: 56 to 145 cm (22 to 57 in)
Oi, Oe, or Oa horizon:
Hue: 7.5YR or 10YR
Value: 2 to 3
Chroma: 1 to 3
Texture: peat, mucky peat, muck
Organic matter: 60 to 90 percent
Reaction class: strongly acid to neutral (pH 5.1 to 7.3)
A horizon:
Hue: 10YR or 2.5Y
Value: 2 to 3
Chroma: 1 to 3
Texture: silt loam, loam, gravelly silt loam
Sand: 16 to 40 percent
Silt: 45 to 77 percent
Clay: 7 to 19 percent
Rock fragments: 0 to 26 percent gravels
Organic matter: 3 to 6 percent
Reaction class: slightly acid to neutral (pH 6.2 to 7.0)
C horizon:
Hue: 2.5Y or 5Y
Value: 4 to 6
Chroma: 1 to 2
Texture: clay loam, loam, gravelly clay loam
Sand: 25 to 42 percent
Silt: 30 to 49 percent
Clay: 26 to 32 percent
Rock fragments: 10 to 26 percent gravels
Organic matter: 0.4 to 1.2 percent
Reaction class: slightly acid to neutral (pH 6.4 to 7.3)
A/Cjj horizon:
C material: Hue of 10YR or 2.5Y, value of 4 to 6, chroma of 1 to 3.
A material: Hue 10YR or 2.5Y, value of 2 to 3, chroma of 1 to 2
A Value: 2 to 3
A Chroma: 1 to 2
Texture: silt loam, sandy clay loam, clay loam, loam, gravelly clay loam
Sand: 11 to 67 percent
Silt: 3 to 73 percent
Clay: 16 to 36 percent
Rock fragments: 2 to 34 percent gravels
Organic matter: 0.8 to 1.5 percent
Reaction class: neutral (pH 6.6 to 7.3)
Cf horizon:
Hue: 10YR or 2.5Y
Value: 4 to 5
Chroma: 1 to 2
Texture: permanently frozen clay loam, permanently frozen loam, permanently frozen silt loam, permanently frozen gravelly clay loam.
Sand: 22 to 40 percent
Silt: 25 to 54 percent
Clay: 20 to 35 percent
Rock fragments: 2 to 32 percent gravels
Organic matter: 0.4 to 1 percent
Reaction class: neutral to slightly alkaline (pH 6.9 to 7.7)
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING:
Elevation: 400 to 800 meters (1310 to 2625 ft)
Parent material: organic material over fine-silty lacustrine deposits
Landform: river valleys, lacustrine terraces, flats, bluffs
Slopes: 0 to 15 percent
Mean annual precipitation: 300 to 500 mm (12 to 20 in)
Mean annual air temperature: -4 to -2 degrees C (25 to 28 degrees F)
Frost-free period: 20 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Aquatna,
Eskilida,
Klasi,
Klawasi,
Kluna, and Tacaes soils.
Aquatna soils are very poorly drained, lack permafrost, have stratified material in all horizons, and occur on floodplains.
Eskilida soils lack permafrost, have a folistic epipedon, and occur on terraces in river valleys.
Klasi soils are very poorly drained, lack cryoturbation, have a histic epipedon, and occur on lacustrine terraces.
Klawasi soils a very poorly drained, lack cryoturbation, have a histic epipedon, have a loess cap over clayey lacustrine sediments, and occur on lacustrine terraces.
Kluna soils are well drained, lack permafrost, have stratified horizons of sandy and silty alluvium, and occur on stream terraces and floodplains.
Tacaes soils are very poorly drained, lack permafrost, are organic soils, have permafrost, and occur in depressions and drainages.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class: poorly drained
Saturated Hydraulic Conductivity: very high in the Oi and Oe horizons, high in the Oa horizon, moderately high in the A, C, and C/Ajj horizons, low in the Cf horizon
Permeability: Very rapid in the Oi and Oe horizons, moderately rapid in the Oa horizon, moderate in the A horizon, moderately slow in the C and C/Ajj horizons, and very slow in the Cf horizon.
Runoff: very high
USE AND VEGETATION:
Use: wildlife habitat, recreation, and subsistence
Native vegetation: Black spruce, mosses, and labrador tea
DISTRIBUTION AND EXTENT: MLRA 227 Interior Alaska mountains.
Extent: extensive
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: 45 to 120 cm (18 to 47 in)
Histic epipedon: 0 to 20 cm (0 to 8 in) (Oi, Oe, and Oa horizons)
Aquic conditions: 0 to 125 cm (0 to 47 in) (Oi, Oe, Oa, A, C, and C/Ajj horizons)
Gelic materials: 78 to 125 cm (31 to 49 in) (A/Cjj horizon)
Redoximorphic concentrations: 27 to 125 cm (11 to 49 in) (C and A/Cjj horizons)
Cryoturbation: 78 to 125 cm (31 to 49 in) (A/Cjj horizon)
Permafrost: 125 to 150 cm (49 to 59 in) (Cf horizon)
ADDITIONAL DATA:
User pedon Id: 2016AK261021
National Cooperative Soil Survey
U.S.A.