LOCATION REDOUBT                 AK

Established Series
Rev. DVP/DLM
02/2022

REDOUBT SERIES

Depth class: very deep
Drainage class: well drained
Parent material: ash influenced loess over loamy glacial till
Landform: nunataks on till plains and disintegration moraines on till plains
Slopes: 0 to 45 percent
Mean annual precipitation: 20 to 35 inches
Mean annual temperature: 33 to 36 degrees F.

TAXONOMIC CLASS: Medial over loamy, amorphic over mixed, superactive Andic Humicryods

TYPICAL PEDON: Redoubt silt loam - on a northwest facing slope of 6 percent under Lutz spruce, tall grass, and shrubs at 1,310 feet elevation. (All colors are for moist soil unless noted)

Oe--0 to 2 inches; very dark brown (10YR 2/2) moderately decomposed plant material; many very fine and fine roots; very strongly acid (pH 4.5); clear smooth boundary. (1 to 4 inches thick)

E--2 to 3 inches; dark grayish brown (10YR 4/2) silt loam; weak fine granular structure; very friable, nonsticky and nonplastic; many very fine and fine roots; 10 percent gravel; extremely acid (pH 4.3); clear wavy boundary. (1 to 3 inches thick)

Bhs--3 to 4 inches; dark reddish brown (5YR 2.5/2) mucky silt loam; moderately fine granular structure; very friable, nonsticky and nonplastic; many very fine, and fine roots; smeary; 10 percent gravel; extremely acid (pH 4.4); clear wavy boundary. (1 to 6 inches thick)

Eb--4 to 6 inches; dark grayish brown (10YR 4/2) silt loam; weak thin platy structure; very friable, nonsticky and nonplastic; many very fine and fine roots; 10 percent gravel; extremely acid (pH 4.4); clear wavy boundary. (1 to 3 inches thick)

Bhsb--6 to 22 inches; dark reddish brown (5YR 3/3) mucky silt loam; moderate fine granular structure; very friable, nonsticky and nonplastic; many very fine and fine roots; smeary; 10 percent gravel; extremely acid (pH 4.4); clear wavy boundary. (4 to 17 inches thick)

2C--22 to 60 inches; dark grayish brown (2.5Y 4/2) gravelly sandy loam; massive; friable, nonsticky and nonplastic; 25 percent gravel; strongly acid (pH 5.5).

TYPE LOCATION: Western Kenai Peninsula Area, Alaska; about 12 miles SE of Clam Gulch; about 1,100 feet west and 1,200 feet south of the NE 1/4, section 14, T. 1 S., R. 11 W; Kenai A-4 1:25,00 quad; Seward Meridian; UTM north 6663255 and UTM east 605049, zone 5.

RANGE IN CHARACTERISTICS:

Soil moisture regime: udic
Mean annual soil temperature: 35 degrees F
Solum thickness: 20 to 39 inches and is bisequal
Thickness of ash influence loess: 20 to 30 inches

O horizon:
Matrix color: hue of 7.5YR or 10YR; value of 2 to 4; chroma of 2 to 4
Reaction class: extremely acid to strongly acid

E or Eb horizons:
Matrix color: hue of 10YR or 2.5Y; value of 3 to 5; chroma of 1 or 2
Texture: silt loam, very fine sandy loam
Coarse fragments: 0 to 14 percent gravel
Reaction class: extremely acid to strongly acid

Bhs or Bhsb horizons:
Matrix color: hue of 5YR or 7.5YR; value of 2 or 3; chroma of 1 to
Texture: mucky silt loam, mucky very fine sandy loam
Coarse fragments: 0 to 14 percent gravel
Total organic carbon: 6 to 12 percent
Reaction class: extremely acid to strongly acid

2C horizon:
Matrix color: hue of 2.5Y or 5Y; value of 4 or 5; chroma of 2 or 3
Texture: sandy loam, loam, silt loam modified by 0 to 30 percent total coarse fragments, 0 to 30 percent gravel, 0 to 5 percent cobbles
Reaction class: extremely acid to strongly acid

COMPETING SERIES: This is the Puntilla series. Puntilla soils have firm consistence in the substratum.

GEOGRAPHIC SETTING:
Drainage class: well drained
Parent material: ash influenced loess over loamy glacial till
Landform: nunataks on till plains and disintegration moraines on till plains
Slopes: 0 to 45 percent
Mean annual temperature: 33 to 36 degrees F.
Mean annual precipitation: 20 to 35 inches

GEOGRAPHICALLY ASSOCIATED SOILS: These include Iliamna and Talkeetna soils. Iliamna and Talkeetna soils are well drained and occur on similar landscapes.

DRAINAGE AND PERMEABILITY: Well drained, low to high runoff, saturated hydraulic conductivity is high in the solum and moderately high to high in the substratum.

USE AND VEGETATION: Used for forestry, wildlife habitat, and recreation. The native vegetation is Lutz spruce,, paper birch, alder, tall grass, and shrubs.

DISTRIBUTION AND EXTENT: MLRA 224 Cook Inlet Lowlands, South-central Alaska, The series is of small extent.

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

SERIES ESTABLISHED: Area, Alaska, 2005

REMARKS: Diagnostic features and horizons recognized in this profile include:
Albic horizons: from 2 to 3 inches and 4 to 6 inches.
Spodic horizons: from 3 to 4 inches and 6 to 22 inches, with 6 to 12 percent total carbon.
Amorphous material: from 3 to 22 inches.
Temperature regime: cryic

ADDITIONAL DATA: Soil characterization sample 01AK122004 from Western Kenai Peninsula Area, Alaska, samples by SSL, Lincoln NE, 07/2001

---

National Cooperative Soil Survey
U.S.A.