LOCATION CATPEAK                 WA

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

CATPEAK SERIES

Landscape--mountains
Landform--cirques and structural benches
Slope--0 to 100 percent
Parent material--residuum
Mean annual precipitation--about 3500 mm
Mean annual air temperature--about 4 degrees C
Depth class--moderately deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic

TAXONOMIC CLASS: Loamy-skeletal, isotic Andic Humicryepts

TYPICAL PEDON: Catpeak silt loam on a northeast facing, non-forested cirque with a slope of 40 percent and an elevation of 1500 m. (The soil was moist throughout when described.)

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

Oe--1 to 8 cm; moderately decomposed plant material; abrupt wavy boundary

A--8 to 16 cm; brown (7.5YR 4/2) dry, dark brown (7.5YR 3/2) silt loam; moderate fine granular structure; soft, very friable, slightly sticky, slightly plastic; moderately smeary; common very fine, fine, and medium and few coarse roots; common fine and medium tubular and common fine irregular pores; 10 percent gravel; very strongly acid (pH 4.6); abrupt wavy boundary

Bw1--16 to 29 cm; brown (10YR 4/3) dry, dark brown (10YR 3/3) gravelly silt loam; moderate fine subangular blocky structure; soft, very friable, slightly sticky, moderately plastic; weakly smeary; common very fine and few fine and medium roots; common fine and medium tubular and common fine irregular pores; 15 percent gravel; very strongly acid (pH 4.7); clear smooth boundary

Bw2--29 to 60 cm; brown (10YR 5/3) dry, brown (10YR 4/3) extremely gravelly loam; weak very fine subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; common very fine, fine, and medium roots; common fine and medium interstitial and few fine irregular pores; 60 percent gravel, 5 percent cobbles; very strongly acid (pH 4.8); clear smooth boundary

Bw3--60 to 84 cm; brown (10YR 5/3) dry, brown (10YR 4/3) extremely gravelly sandy loam; weak very fine subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; few fine, medium, and coarse roots; common fine and medium interstitial pores; 70 percent gravel, 5 percent cobbles; very strongly acid (pH 4.9); clear wavy boundary

Cr--84 cm; weathered bedrock

TYPE LOCATION: Clallam County, Washington; near Happylake campsites in Olympic National Park
Latitude--48.0053390
Longitude-- -123.6759200
Datum--WGS84

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--0 to 3 degrees C
Umbric epipedon thickness--18 to 25 cm
Depth to restrictive layer--50 to 100 cm

Particle-size control section
*Clay content--8 to 18 percent
*Total rock fragment content--50 to 80 percent
*Gravel content--40 to 75 percent
*Cobble content--0 to 20 percent
*Stone content--0 to 15 percent

O horizons
Combined thickness--0 to 10 percent

A horizon
Hue--10YR or 7.5YR
Value--2 to 4 dry, 2 or 3 moist
Chroma--1 to 3 dry or moist
Fine-earth texture--silt loam, loam, sandy loam
Clay content--8 to 18 percent
Total rock fragment content--0 to 35 percent
Gravel content--0 to 30 percent
Cobble content--0 to 10 percent
Reaction--4.5 to 5.5
Thickness--5 to 20 cm

Bw1 horizon
Hue--10YR or 7.5YR
Value--2 to 4 dry, 2 or 3 moist
Chroma--1 to 3 dry or moist
Fine-earth texture--silt loam, loam, sandy loam
Clay content--8 to 18 percent
Total rock fragment content--10 to 40 percent
Gravel content--10 to 30 percent
Cobble content--0 to 20 percent
Stone content--0 to 10 percent
Reaction--4.5 to 5.5
Thickness--10 to 25 cm

Bw2 and Bw3 horizons
Hue--10YR or 7.5YR
Value--4 or 5 dry or moist
Chroma--3 or 4 dry or moist
Fine-earth texture--silt loam, loam, sandy loam
Clay content--8 to 18 percent
Total rock fragment content--50 to 80 percent
Gravel content--40 to 75 percent
Cobble content--0 to 20 percent
Stone content--0 to 15 percent
Reaction--4.5 to 5.5
Combined thickness--45 to 65 cm

COMPETING SERIES:
Ahklun--A horizon contains 4 to 8 percent clay and has a mantle of tephra with volcanic glass in the fine earth fraction
Chiroskey, Goodlow, Muddycreek, Nagugun, and Marmotpass --lithic contact below 150 cm from the soil surface

GEOGRAPHIC SETTING:
Elevation--1300 to 1800 m
Climate--cool, dry summers; cold, wet winters
Mean annual precipitation--3000 to 4000 mm
Mean annual air temperature--2 to 6 degrees C
Frost-free period--30 to 60 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Allincreek--lithic contact within 25 to 50 cm of the soil surface; similar landforms
Hungrycreek--no umbric epipedon or lithic contact; similar landforms
Ringlake--aquic conditions within 0 to 25 cm of the mineral soil surface; depressions on similar landforms

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturation in normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high or very high throughout

USE AND VEGETATION:
Use--wildlife habitat, recreation
Potential natural vegetation--Olympic mountain aster, broadleaf lupine, showy sedge, Roemer's fescue

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

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

SERIES PROPOSED: Olympic National Park, Clallam County, Washington 2023; name from Cat peak in Olympic National Park

REMARKS:
Diagnostic horizons and other features in this pedon:
*Particle-size control section--zone from 33 to 84 cm
*Umbric epipedon--zone from 8 to 29 cm
*Andic subgroup features--zone from 8 to 29 cm; AO extractable Al plus Fe is 1 to 2 percent and Db is 0.9 to 1.0 g/cm3
*Cambic horizon--zone from 29 to 84 cm
*Paralithic contact--84 cm

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National Cooperative Soil Survey
U.S.A.