LOCATION BUCKINGHORSECREEK WA
Tentative Series
IRD. MGR/AJF/MPR
01/2025
BUCKINGHORSECREEK SERIES
Landscape--mountains
Landform--drainageways and seeps on cirques and glacial valley walls
Slope--0 to 35 percent
Parent material--colluvium from metasedimentary rock
Mean annual precipitation--about 3250 mm
Mean annual air temperature--about 4 degrees C
Depth class--very deep
Drainage class--somewhat poorly drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--oxyaquic
TAXONOMIC CLASS: Loamy-skeletal, isotic Oxyaquic Humicryepts
TYPICAL PEDON: Buckinghorsecreek loam on a west facing, non-forested cirque with a slope of 5 percent and an elevation of 1520 m. (The soil was moist throughout when described.)
A1--0 to 12 cm; very dark grayish brown (10YR 3/2) dry, black (10YR 2/1) loam; moderate fine granular structure; soft, very friable, slightly sticky, slightly plastic; many very fine and common fine roots; common very fine tubular and few fine irregular and interstitial pores; 10 percent gravel; very strongly acid (pH 4.6); abrupt wavy boundary
A2--12 to 50 cm; dark grayish brown (10YR 4/2) dry, very dark brown (10YR 2/2) very gravelly loam; moderate very fine subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; common very fine and fine and few medium roots; few very fine tubular and few fine irregular and few medium interstitial pores; 40 percent gravel, 10 percent cobbles; very strongly acid (pH 4.6); abrupt smooth boundary
Bg1--50 to 75 cm; brown (10YR 5/3) dry, dark grayish brown (10YR 4/2) very gravelly silt loam; moderate medium subangular blocky structure; soft, very friable, moderately sticky, moderately plastic; few very fine roots; few fine irregular and common fine interstitial pores; 5 percent faint gray (10YR 5/1) iron depletions; 50 percent gravel; very strongly acid (pH 4.8); clear smooth boundary
Bg2--75 to 150 cm; pale brown (10YR 6/3) dry, dark grayish brown (10YR 4/2) very gravelly silt loam; moderate medium subangular blocky structure; soft, very friable, moderately sticky, moderately plastic; few very fine roots; few fine irregular and common fine interstitial pores; 5 percent faint gray (10YR 5/1) iron depletions; 50 percent gravel, 5 percent cobbles; very strongly acid (pH 4.8); clear smooth boundary
TYPE LOCATION: Clallam County, Washington; near Happy lake in Olympic National Park
Latitude--48.0093280
Longitude-- -123.6860100
Datum--WGS84
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--0 to 7 degrees C
Umbric epipedon thickness--20 to 55 cm
Particle-size control section
*Clay content--8 to 25 percent
*Total rock fragment content--35 to 60 percent
*Gravel content--30 to 55 percent
*Cobble content--0 to 20 percent
*Stone content--0 to 15 percent
A1 horizon
Value--3 or 4 dry, 2 or 3 moist
Chroma--1 or 2 dry or moist
Fine-earth texture--silt loam, loam, sandy loam
Clay content--8 to 25 percent
Total rock fragment content--0 to 40 percent
Gravel content--0 to 30 percent
Cobble content--0 to 15 percent
Reaction--4.5 to 5.5
Thickness--10 to 20 cm
A2 horizon
Value--3 or 4 dry, 2 or 3 moist
Chroma--2 or 3 dry or moist
Fine-earth texture--silt loam, loam, sandy loam
Clay content--8 to 25 percent
Total rock fragment content--35 to 60 percent
Gravel content--30 to 55 percent
Cobble content--0 to 20 percent
Reaction--4.5 to 5.5
Thickness--30 to 40 cm
Bg1 and Bg2 horizons
Value--4 to 6 dry or moist
Chroma--1 to 3 dry or moist
Fine-earth texture--silt loam, loam, sandy loam
Clay content--8 to 25 percent
Total rock fragment content--35 to 60 percent
Gravel content--30 to 55 percent
Cobble content--0 to 20 percent
Stone content--0 to 15 percent
Reaction--4.5 to 5.5
Combined thickness--80 to 120 cm
COMPETING SERIES: None
GEOGRAPHIC SETTING:
Elevation--900 to 1800 m
Climate--cool, dry summers; cold, wet winters
Mean annual precipitation--2500 to 4000 mm
Mean annual air temperature--0 to 6 degrees C
Frost-free period--30 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Mountmystery--no aquic conditions, andic soil properties; glacial valley walls
Ignarcreek--no aquic conditions, has albic and spodic horizons, andic soil properties; glacial valley walls
Cultuscreek--no aquic conditions, lithic contact within 25 to 50 cm of the soil surface; bedrock benches
Lollah--no aquic conditions, andic soil properties; cirques
Catpeak--no aquic conditions, lithic contact within 50 to 100 cm of the soil surface; summits and bedrock benches
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--somewhat poorly drained
Saturation in normal years--seasonally high water table top depth of 25 to 50 cm September through June and 50 to 100 cm July and August
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high or very high throughout
USE AND VEGETATION:
Use--wildlife habitat, recreation
Potential natural vegetation--Cascade huckleberry, Sitka valerian, green false hellebore, showy sedge
DISTRIBUTION AND EXTENT: Olympic Mountains, Washington; MLRA 1; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Olympic National Park, Clallam County, Washington 2023; name from Buckinghorse creek in Olympic National Park
REMARKS:
Diagnostic horizons and other features in this pedon:
*Particle-size control section--zone from 25 to 100 cm
*Umbric epipedon--zone from 0 to 50 cm
*Cambic horizon--zone from 50 to 150 cm
*Redox depletions with chroma 2 or less--zone from 50 to 150 cm
*Oxyaquic conditions--saturation in one or more layers within 100 cm of the mineral soil surface for 30 or more cumulative days of the year
National Cooperative Soil Survey
U.S.A.