LOCATION HAYDENPASS WA
Tentative Series
IRD. MGR/AJF/MPR
01/2025
HAYDENPASS SERIES
Landscape--river valley
Landform--alluvial terraces
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--well drained
Soil moisture regime--udic
Soil temperature regime--mesic
Soil moisture subclass--typic
TAXONOMIC CLASS: Coarse-loamy, mixed, active, mesic Typic Humudepts
TYPICAL PEDON: Haydenpass loam on a north-facing, forested alluvial terrace with a slope of 8 percent and an elevation of 540 m. (The soil was moist throughout when described.)
Oi--0 to 3 cm; slightly decomposed plant material; abrupt wavy boundary
A--3 to 18 cm; brown (10YR 4/3) dry, very dark grayish brown (10YR 3/2) loam; moderate fine granular structure; soft, very friable, moderately sticky, moderately plastic; weakly smeary; common very fine, fine, coarse, and very coarse and few medium roots; many fine irregular pores; 10 percent gravel; very strongly acid (pH 4.6); abrupt smooth boundary
Bw1--18 to 45 cm; brown (10YR 4/3) dry, very dark grayish brown (10YR 3/2) silt loam; moderate medium subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; weakly smeary; few fine and medium and common coarse and many very fine roots; few medium tubular and common fine irregular pores; very strongly acid (pH 4.7); clear smooth boundary
Bw2--45 to 71 cm; light olive brown (2.5Y 5/3) dry, dark grayish brown (2.5Y 4/2) silt loam; moderate medium subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; weakly smeary; few medium, coarse, and very coarse and common very fine and fine roots; common very fine irregular and few fine and medium tubular pores; very strongly acid (pH 4.8); clear smooth boundary
Bw3--71 to 150 cm; dark grayish brown (2.5Y 4/2) dry, very dark gray (2.5Y 3/1) gravelly sandy loam; weak very fine subangular blocky structure; soft, very friable; common very fine and fine and few medium and very coarse roots; few fine irregular and interstitial pores; 20 percent gravel and 5 percent cobbles; very strongly acid (pH 4.8); clear smooth boundary
TYPE LOCATION: Near Hayes Guard Station in Olympic National Park, Jefferson County, Washington
Latitude--47.8105250
Longitude-- -123.4514510
Datum--WGS84
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--8 to 13 degrees C
Umbric epipedon thickness--18 to 40 cm
Particle-size control section
*Clay content--8 to 17 percent
*Total rock fragment content--0 to 25 percent
*Gravel content--0 to 25 percent
*Cobble content--0 to 10 percent
Oi horizon
Thickness--0 to 8 cm
A horizon
Hue--10YR or 7.5YR
Value--2 or 3 moist, 3 to 5 dry
Chroma--1 to 3, moist or dry
Fine-earth texture--silt loam, loam, or sandy loam
Clay content--8 to 17 percent
Total rock fragment content--0 to 20 percent
Gravel content--0 to 15 percent
Cobble content--0 to 5 percent
Reaction--4.5 to 5.5
Thickness--10 to 25 cm
Bw1 horizon
Value--2 or 3 moist, 3 to 5 dry
Chroma--1 to 3, moist or dry
Fine-earth texture--silt loam, loam, or sandy loam
Clay content--8 to 17 percent
Total rock fragment content--0 to 25 percent
Gravel content--0 to 25 percent
Cobble content--0 to 10 percent
Reaction--4.5 to 5.5
Thickness--20 to 30 cm
Bw2 and Bw3 horizons
Hue--10YR or 2.5Y
Value--3 or 4 moist, 4 or 5 dry
Chroma--1 to 3, moist or dry
Fine-earth texture--silt loam, loam, or sandy loam
Clay content--8 to 17 percent
Total rock fragment content--0 to 30 percent
Gravel content--0 to 25 percent
Cobble content--0 to 10 percent
Reaction--4.5 to 5.5
Combined thickness--80 to 120 cm
COMPETING SERIES:
Tahkenitch--paralithic contact within 100 to 150 cm of the mineral soil surface
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 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Stukey--particle size control section contains 35 to 65 percent rock fragment; similar landforms
Happylake--aquic conditions within 25 to 50 cm of mineral soil surface; depressions on similar landforms
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturation in normal years--none
Flooding--very rare
Ponding--none
Saturated hydraulic conductivity (Ksat)--high or very high throughout
USE AND VEGETATION:
Use--wildlife habitat, recreation
Potential natural vegetation--western hemlock, Douglas-fir, salmonberry, red huckleberry, vine maple, western swordfern, twinflower, youth on age, pacific trillium and common ladyfern
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 Hayden Pass in Olympic National Park
REMARKS:
Diagnostic horizons and other features in this pedon:
*Particle-size control section--zone from 27 to 103 cm
*Umbric epipedon--zone from 3 to 45 cm
*Cambic horizon--zone from 45 to 150 cm
National Cooperative Soil Survey
U.S.A.