LOCATION IGNARCREEK WA
Tentative Series
IRD. MGR/AJF/MPR
01/2025
IGNARCREEK SERIES
Landscape--mountains
Landform--glacial valley walls
Slope--25 to 65 percent
Parent material--colluvium from metasedimentary rock
Mean annual precipitation--about 3000 mm
Mean annual air temperature--about 8 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Loamy-skeletal, isotic Andic Haplocryods
TYPICAL PEDON: Ignarcreek gravelly silt loam on a southeast-facing, forested glacial-valley wall with a slope of 60 percent and an elevation of 1225 m. (The soil was moist throughout when described.)
Oi--0 to 5 cm; slightly decomposed plant material; abrupt smooth boundary
Oe--5 to 13 cm; moderately decomposed plant material; abrupt smooth boundary
E--13 to 18 cm; gray (10YR 6/1) dry, gray (10YR 5/1) gravelly silt loam; moderate fine granular structure; soft, very friable, slightly sticky, slightly plastic; moderately smeary; common very fine and fine roots and few medium roots; common very fine and fine irregular and few very fine and fine tubular pores; 25 percent gravel; extremely acid (pH 3.9); abrupt smooth boundary
Bs1--18 to 47 cm; reddish yellow (7.5YR 6/6) dry, strong brown (7.5YR 4/6) very gravelly silt loam; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; weakly smeary; common very fine, fine, and medium and few coarse roots; many very fine irregular and many fine irregular pores; 35 percent gravel; extremely acid (pH 4.3); abrupt wavy boundary
Bs2--47 to 66 cm; reddish yellow (7.5YR 6/6) dry, strong brown (7.5YR 4/6) very gravelly silt loam; moderate fine subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; weakly smeary; common very fine and few medium and fine roots; common fine irregular and few fine interstitial pores; 50 percent gravel; extremely acid (pH 4.3); clear wavy boundary
Bw1--66 to 110 cm; yellowish brown (10YR 5/4) dry, dark yellowish brown (10YR 3/4) extremely gravelly loam; moderate very fine subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; few very fine and fine roots; common fine irregular and few fine interstitial pores; 65 percent gravel; very strongly acid (pH 4.6); clear smooth boundary
Bw2--110-150 cm; yellowish brown (10YR 5/4) dry, dark yellowish brown (10YR 4/4) extremely gravelly loam; weak very fine subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; few very fine roots; few fine interstitial pores; 55 percent gravel, 10 percent cobbles; very strongly acid (pH 4.7); clear smooth boundary
TYPE LOCATION: Clallam County, Washington; on the Deer lake Mink lake trail about half a mile east of Mink lake junction in Olympic National Park
Latitude--47.9329880
Longitude-- -123.8645250
Datum--WGS84
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--4 to 7 degrees C
Albic horizon thickness--3 to 15 cm
Spodic horizon thickness--35 to 50 cm
Particle-size control section
*Clay content--8 to 18 percent
*Total rock fragment content--45 to 75 percent
*Gravel content--40 to 70 percent
*Cobble content--0 to 20 percent
*Stone content--0 to 15 percent
O horizons
Combined thickness--5 to 15 cm
E horizon
Value--5 to 7 dry, 4 to 6 moist
Chroma--1 or 2 dry or moist
Fine-earth texture--silt loam, loam, sandy loam
Clay content--8 to 18 percent
Total rock fragment content--15 to 40 percent
Gravel content--10 to 35 percent
Cobble content--0 to 15 percent
Reaction--3.5 to 4.4
Thickness--3 to 15 cm
Bs1 and Bs2 horizons
Hue--10YR or 7.5YR
Value--4 to 6 dry, 3 to 5 moist
Chroma--4 to 6 dry or moist
Fine-earth texture--silt loam, loam, or sandy loam
Clay content--8 to 18 percent
Total rock fragment content--30 to 55 percent
Gravel content--30 to 55 percent
Cobble content--0 to 20 percent
Stone content--0 to 15 percent
Reaction--3.5 to 4.4
Combined thickness--35 to 50 cm
Bw1 and Bw2 horizons
Hue--10YR or 7.5YR
Value--4 to 6 dry, 3 to 5 moist
Chroma--3 to 6 moist or dry
Fine-earth texture--silt loam, loam, sandy loam
Clay content--8 to 18 percent
Total rock fragment content--45 to 75 percent
Gravel content--40 to 70 percent
Cobble content--0 to 20 percent
Stone content--0 to 15 percent
Reaction--4.5 to 5.5
Combined thickness--70 to 100 cm
COMPETING SERIES:
Conto,
Nimue,
Playco-- have a mantle of tephra with volcanic glass in the fine earth fraction
Springsteen--lithic contact within 50 to 100 cm of the soil surface
Nonamecreek --has a mean annual soil temperature of 0 to 3 degrees C
GEOGRAPHIC SETTING:
Elevation--900 to 1300 m
Climate--cool, dry summers; cold, wet winters
Mean annual precipitation--2500 to 3500 mm
Mean annual air temperature--7 to 9 degrees C
Frost-free period--60 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Mountmystery--no albic or spodic horizons; similar landforms
Lakedilly--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--mountain hemlock, Pacific silver fir, black huckleberry, oval-leaf huckleberry, white avalanche-lily, strawberryleaf raspberry
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 Ignar creek in Olympic National Park
REMARKS:
Diagnostic horizons and other features in this pedon
*Particle-size control section--zone from 38 to 113 cm
*Ochric epipedon
*Andic subgroup features--zone from 13 to 66 cm; AO extractable Al plus Fe is 1 to 2 percent and Db is 0.9 to 1.0 g/cm3*Albic horizon--zone from13 to 18 cm
*Spodic horizon--zone from 18 to 66 cm
National Cooperative Soil Survey
U.S.A.