LOCATION DAMCREEK                AK

Established Series
SAS/TJR/SJN
02/2022

DAMCREEK SERIES

The Damcreek series consists of very deep, somewhat poorly drained soils formed in alluvium in drainageways. Slopes range from 4 to 16 percent. The mean annual precipitation is about 820 millimeters and the mean annual air temperature is about 0.4 degrees C.

TAXONOMIC CLASS: Coarse-loamy, isotic, nonacid Fluvaquentic Cryaquepts

TYPICAL PEDON: Damcreek stratified highly organic silt, located in a drainageway on a plain with a slope of 14 percent and elevation of 38 meters; when described on July 13th, 2011 the soil was wet from 0 to 60 cm (Colors are for moist soil unless otherwise noted)

Oi--0 to 7 centimeters; slightly decomposed plant material; nonsticky, nonplastic; many fine roots and common medium roots and many very fine roots; moderately acid, pH 5.8; clear smooth boundary

Oa--7 to 18 centimeters; highly decomposed plant material; nonsticky, nonplastic; many fine roots and common medium roots and many very fine roots; moderately acid, pH 5.9; clear smooth boundary

A1--18 to 40 centimeters; very dark brown (7.5YR 2.5/2) stratified highly organic silt; 13 percent sand; 80 percent silt; 7 percent clay; weak medium granular structure; very friable, nonsticky, nonplastic; many fine roots and many very fine roots; slightly acid, pH 6.1; clear wavy boundary

2A2--40 to 60 centimeters; dark brown (7.5YR 3/2) gravelly silt loam; 30 percent sand; 63 percent silt; 7 percent clay; weak fine subangular blocky structure; friable, nonsticky, nonplastic; common very fine roots; 1 percent nonflat 2 to 5 millimeter fragments and 14 percent nonflat 5 to 75 millimeter fragments; moderately acid, pH 5.9; abrupt smooth boundary

2Cg--60 to 183 centimeters; dark greenish gray (5GY 4/1) loam; 45 percent sand; 37 percent silt; 18 percent clay; massive structure; firm, slightly sticky, moderately plastic; 1 percent nonflat 2 to 5 millimeter fragments and 9 percent nonflat 5 to 75 millimeter fragments; slightly acid, pH 6.1

TYPE LOCATION: Dillingham Census Area, Alaska; 2.5 kilometers north of the Village of Aleknagik; 59.30333 degrees north latitude and 158.623611 degrees west longitude.

RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 0.9 to 2.5 degrees C (cryic soil temperature regime)
Soil moisture control section - Soil is wet within 60 centimeters of the soil surface for much of the growing season in most years (aquic soil moisture regime)
Thickness of umbric epipedon - 33 to 75 cm
Depth to reduced matrix - 39 to 60 cm
Depth to aquic conditions - 39 to 60 cm

All mineral horizons-
Reaction - 5.8 to 6.3

Particle-size control section-
Clay content - 4 to 25 percent
Rock fragments - 10 to 38 percent

Oi horizon
Thickness - 5 to 25 cm

Oa horizon (where present)
Thickness - 0 to 11 cm

A1 horizon
Hue - 7.5YR or 10YR
Value - 2 or 2.5
Chroma - 1 or 2
Fine earth texture - Stratified mucky silt, stratified mucky silt loam, or mucky silt
Clay content - 4 to 9 percent
Reaction - 5.8 to 6.1
Rock fragments - 0 to 10 percent subrounded gravels
Thickness - 13 to 33 cm

2A2 horizon
Hue - 7.5YR or 10YR
Value - 2 to 3
Chroma - 1 or 2
Fine earth texture - Silt loam, stratified silt loam, sandy loam
Clay content - 4 to 15 percent
Reaction - 5.9 to 6.2
Rock fragments - 12 to 20 percent subrounded gravels
Thickness - 20 to 21 cm

2Cg horizon
Hue - 5GY or N
Value - 0 or 3
Chroma - 1
Fine earth texture - Loam, sandy loam, or sandy clay loam
Clay content - 4 to 25 percent
Reaction - 6.1 to 6.3
Rock fragments - 10 to 38 percent subrounded gravels
Thickness - 123 to 144 cm

COMPETING SERIES: There are no competing series

GEOGRAPHIC SETTING:
Parent material - Mossy organic material over coarse-silty alluvium over fine-loamy glaciolacustrine deposits
Landform - Drainageways on plains
Slope - 4 to 16 percent
Elevation - 10 to 219 meters
Climate - Cool summers; cold winters, August and September are the wettest months
Mean annual precipitation - 628 to 934 mm
Mean annual air temperature - -0.5 to 0.7 degrees C
Frost free duration - 85 to 140 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Mosquitopoint - Formed in mossy organic parent material, plain talfs
Terlak - No aquic soil conditions, swales on plains
Snagpoint - No aquic soil conditions, hills and plains

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: (Ksat)
Drainage class - Somewhat poorly drained
Saturation in normal years - Within 60 cm of the soil surface for all months
Flooding - Very rare
Ponding - None
Ksat - Moderately low to moderately high in the A1 horizon, moderately high to high in the 2A2 horizon, and moderately low to high in the 2Cg horizon

USE AND VEGETATION:
Use - Wildlife habitat
Potential natural vegetation - Boreal forest composed of white spruce and paper birch, with an understory of willow, sweetgale, bluejoint grass, horsetail, and moss

DISTRIBUTION AND EXTENT: Bristol Bay Lowlands; MLRA 236; small extent

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

SERIES ESTABLISHED: Nushagak-Mulchatna Watershed Soil Survey, Dillingham Census Area, Alaska, 2019

REMARKS:
Particle-size control section - 43 to 118 cm
Umbric epipedon - A1 and 2A2 horizons
Soil moisture regime - Aquic
Aquic soil conditions - 2Cg horizon
Redox concentrations - 2Cg horizon

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National Cooperative Soil Survey
U.S.A.