LOCATION STEEPLEROCK             WA

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

STEEPLEROCK SERIES

Landscape--river valley
Landform--terrace
Slope--0 to 8 percent
Parent material--alluvium
Mean annual precipitation--about 2500 mm
Mean annual air temperature--about 6 degrees C
Depth class--very deep
Drainage class--somewhat excessively well drained
Soil moisture regime-- udic
Soil temperature regime--frigid
Soil moisture subclass--typic

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

TYPICAL PEDON: Steeplerock very cobbly coarse sand on alluvial terrace with slope of 5 percent and elevation of 820 m. (The soil was moist throughout when described)

A--0 to 5 cm; brown (7.5YR 5/3) dry, brown (7.5YR 5/2) very cobbly sand; single grain structure; loose, loose, non-sticky, non-plastic; few very fine and fine roots; many fine interstitial pores; 25 percent gravel, 30 percent cobbles; very strongly acid (pH 4.6); abrupt smooth boundary

C1--5 to 30 cm; gray (10YR 5/1) dry, very dark gray (10YR 3/1) extremely gravely fine sand; single grain structure; loose, loose, non-sticky, non-plastic; many fine interstitial pores; 50 percent gravel, 25 percent cobbles, 5 percent stones, very strongly acid (pH 4.8); clear smooth boundary

C2--30 to 150 cm; gray (10YR 5/1) dry, very dark gray (10YR 3/1) extremely gravely fine sand; single grain structure; loose, loose, non-sticky, non-plastic; many fine interstitial pores; 50 percent gravel, 20 percent cobbles, 5 percent stones, 5 percent boulders; very strongly acid (pH 4.8)

TYPE LOCATION: Olympic National Park, Jefferson County, Washington, Dosewallips River Trail near Diamond Meadows Camp.
Latitude--47.719457
Longitude-- -123.279639
Datum--WGS84

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--5 to 8 degrees C
Mean summer soil temperature--6 to 10 degrees C

Particle size control section
*Clay content--0 to 3 percent
*Total rock fragment content--60 to 85 percent
*Gravel content--50 to 65 percent
*Cobble content--15 to 35 percent
*Stone content--0 to 10 percent
*Boulder content--0 to 5 percent

A horizon
Hue--10YR or 7.5YR
Value--1 to 3 dry or moist
Chroma--3 to 5 dry or moist
Fine-earth texture--fine sand, coarse sand
Clay content--0 to 3 percent
Total rock fragment content--35 to 75 percent
Gravel content--5 to 35 percent
Cobble content--15 to 35 percent
Reaction--4.5 to 5.5
Thickness--5 to 15 cm

C horizons
Hue--10 YR
Value--3 or 4 dry or moist
Chroma--1 or 2 dry or moist
Fine-earth texture--coarse sand, fine sand, loamy sand
Clay content--0 to 3 percent
Total rock fragment content--60 to 85 percent
Gravel content--45 to 65 percent
Cobble content--10 to 35 percent
Stone content--0 to 10 percent
Boulder content--0 to 10 percent
Reaction--4.5 to 5.5
Combined thickness--135 to 145 cm

COMPETING SERIES:
None

GEOGRAPHIC SETTING:
Elevation--450 to 1100 m
Climate--warm, dry summers; cool, wet winters
Mean annual precipitation--2000 to 3000 mm
Mean annual air temperature--7 to 11 degrees C
Frost-free period--90 to 150 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Lapoetcreek--coarse loamy particle size class; occurs on terraces with very rare flooding
Lolocreek--occurs on terraces with very rare flooding

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

USE AND VEGETATION:
Use--wildlife habitat, recreation
Potential natural vegetation-Sitka willow, red alder, trailing blackberry, coastal hedgenettle, Virginia strawberry, dwarf fireweed, bentgrass

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

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

SERIES PROPOSED: Olympic National Park, Jefferson County, Washington 2023; name from Steeple Rock geologic feature in Olympic National Park

REMARKS:
Diagnostic horizons and other features in this pedon:
*Particle-size control section--zone from 25 to 100 cm
*Ochric epipedon

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National Cooperative Soil Survey
U.S.A.