LOCATION FOURSTREAM              WA

Tentative Series
IRD. MGR/AJF/MPR
01/2025

FOURSTREAM SERIES

Landscape--river valley
Landform--alluvial terrace
Slope--0 to 15 percent
Parent material--alluvium
Mean annual precipitation--about 2250 mm
Mean annual air temperature--about 10 degrees C
Depth class--very deep
Drainage class--somewhat excessively drained
Soil moisture regime--udic
Soil temperature regime--mesic
Soil moisture subclass--typic

TAXONOMIC CLASS: Sandy-skeletal, mixed, mesic Typic Udifluvents

TYPICAL PEDON: Fourstream loamy sand on a forested alluvial terrace with a slope of 1 percent and elevation of 370 m. (The soil was moist throughout when described.)

Oi--0 to 1 cm; slightly decomposed plant material; abrupt smooth boundary

A--1 to 24 cm; very dark grayish brown (10YR 3/2) dry, black (10YR 2/1) loamy sand; weak very fine granular structure; soft, very friable; many very fine and few fine roots; common very fine irregular and interstitial pores; very strongly acid (pH 4.6); abrupt smooth boundary

C1--24 to 70 cm; dark gray (10YR 4/1) dry, very dark gray (10YR 3/1) extremely gravelly loamy sand; structureless single grain; loose, loose; common very fine and few fine roots; many fine and medium interstitial pores; 60 percent gravel, 10 percent cobbles; very strongly acid (pH 4.7); abrupt smooth boundary

C2--70 to 92 cm; dark gray (10YR 4/1) dry, very dark gray (10YR 3/1) very gravelly loamy sand; structureless single grain; loose, loose; few fine roots; common very fine interstitial pores; 40 percent gravel; very strongly acid (pH 4.8); abrupt smooth boundary

C3--92 to 150 cm; dark gray (10YR 4/1) dry, very dark gray (10YR 3/1) extremely gravelly loamy sand; structureless single grain; loose; few fine roots; common very fine interstitial pores; 60 percent gravel, 10 percent cobbles; very strongly acid (pH 4.8); clear smooth boundary

TYPE LOCATION: Jefferson County, Washington; Duckabush trail about 1 mile west of 5 mile camp in Olympic National Park.
Latitude--47.6917050
Longitude-- -123.1505130
Datum--WGS84

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--8 to 13 degrees C

Particle-size control section
*Clay content--1 to 5 percent
*Total rock fragment content--40 to 75 percent
*Gravel content--35 to 70 percent
*Cobble content--0 to 50 percent
*Stone content--0 to 20 percent

Oi horizon
Thickness--0 to 5 cm

A horizon
Value--2 or 3 moist, 3 or 4 dry
Chroma--1 or 2 moist or dry
Fine-earth texture--sandy loam, loamy sand, or sand
Clay content--2 to 6 percent
Total rock fragment content--0 to 40 percent
Gravel content--0 to 35 percent
Cobble content--0 to 15 percent
Reaction--4.5 to 5.5
Thickness--15 to 30 cm

C horizons
Hue--10YR or 2.5Y
Value--3 or 4 moist, 4 or 5 dry
Chroma--1 or 2 moist or dry
Fine-earth texture--loamy sand or sand
Clay content--1 to 5 percent
Total rock fragment content--40 to 75 percent
Gravel content--35 to 70 percent
Cobble content--0 to 40 percent
Stone content--0 to 20 percent
Fine-earth texture--loamy sand or sand
Reaction--4.5 to 5.5
Combined thickness--more than 100cm

COMPETING SERIES:
Juno--A horizon is structureless and C horizon is slightly or moderately acid
Ostin--contains flakes of mica throughout
Potomac--C horizons have a chroma of 3 or 4

GEOGRAPHIC SETTING:
Elevation--200 to 550 m
Climate--warm, dry summers; mild, wet winters
Mean annual precipitation--1750 to 2750 mm
Mean annual air temperature--8 to 12 degrees C
Frost-free period--180 to 240 degrees

GEOGRAPHICALLY ASSOCIATED SOILS:
Lowdivide--particle-size control section is coarse-loamy over sandy-skeletal, has a cambic horizon, and is well drained; on similar landforms
Stukey--particle-size control section is loamy-skeletal, has a cambic horizon, and is well drained; on similar landforms
Happylake--poorly drained with coarse-loamy material in the particle-size control section; on depressions of similar landforms

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--somewhat excessively drained
Saturation in normal years--none
Flooding--frequent, brief
Ponding--none
Saturated hydraulic conductivity (Ksat)--very high throughout

USE AND VEGETATION:
Use--wildlife habitat, recreation
Potential natural vegetation--black cottonwood, red alder, willow, California blackberry, coastal hedgenettle, Virginia strawberry

DISTRIBUTION AND EXTENT: Olympic Mountains, Washington; MLRA 1; moderate extent

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana

SERIES PROPOSED: Olympic National Park, Jefferson County, Washington 2023; name from Four Stream trail in Olympic National Park

REMARKS:
Diagnostic horizons and other features in this pedon:
*Particle-size control section-- zone from 26 to 101 cm
*Ochric epipedon

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National Cooperative Soil Survey
U.S.A.