LOCATION LAKEDILLY WA
Tentative Series
IRD. MGR/AJF/MPR
01/2025
LAKEDILLY SERIES
Landscape--mountains
Landform--seeps and depressions on glacial valley walls and colluvial aprons
Slope--0 to 5 percent
Parent material--colluvium
Mean annual precipitation--about 3000 mm
Mean annual air temperature--about 4 degrees C
Depth class--very deep
Drainage class--poorly drained
Soil moisture regime--aquic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Loamy-skeletal, isotic, acid Typic Cryaquepts
TYPICAL PEDON: Lakedilly sandy loam on an east facing, non-forested glacial valley wall with a slope of 2 percent and an elevation of 1400 m. (The soil was moist throughout when described.)
A--0 to 13 cm; very dark grayish brown (10YR 3/2) dry, very dark brown (10YR 2/2) sandy loam; weak fine granular structure; slightly hard, friable; many very fine roots; common fine tubular and interstitial pores; 10 percent gravel; very strongly acid (pH 4.6); abrupt smooth boundary
Bg1--13 to 37 cm; grayish brown (10YR 5/2) dry, dark grayish brown (10YR 4/2) gravelly sandy loam; weak fine granular structure; slightly hard, friable; many very fine roots; common fine interstitial pores; 3 percent yellowish red (5YR 4/6) masses of oxidized iron; 15 percent gravel; very strongly acid (pH 4.7); abrupt wavy boundary
Bg2--37 to 50 cm; grayish brown (10YR 5/2) dry, dark grayish brown (10YR 4/2) very gravelly loam; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; common very fine roots; common fine interstitial pores; 3 percent yellowish red (5YR 4/6) masses of oxidized iron; 40 percent gravel; very strongly acid (pH 4.7); abrupt wavy boundary
Bg3--50 to 68 cm; grayish brown (2.5Y 5/2) dry, olive brown (2.5Y 4/3) very gravelly sandy loam; weak fine subangular blocky structure; slightly hard, friable; many very fine roots; common fine interstitial pores; 4 percent strong brown (7.5YR 4/6) masses of oxidized iron; 45 percent gravel; very strongly acid (pH 4.8); abrupt smooth boundary
Bg4--68 to 150 cm; light olive brown (2.5Y 5/3) dry, dark grayish brown (2.5Y 4/2) very gravelly sandy loam; weak fine subangular blocky structure; slightly hard, friable; common very fine and fine roots; common fine interstitial pores; 3 percent strong brown (7.5YR 4/6) masses of oxidized iron; 50 percent gravel; very strongly acid (pH 4.9); clear smooth boundary
TYPE LOCATION: Jefferson County, Washington; 150 m north of Anderson pass on the Anderson Moraine Primitive trail in Olympic National Park
Latitude--47.6973725
Longitude-- -123.3276349
Datum--WGS84
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--0 to 7 degrees C
Depth to aquic conditions--within 0 to 25 cm of the mineral soil surface
Particle-size control section
*Clay content--6 to 18 percent
*Gravel content--25 to 50 percent
*Cobble content--0 to 20 percent
*Stone content--0 to 15 percent
A horizon
Value--2 or 3 dry or moist
Chroma--1 or 2 dry or moist
Fine-earth texture--silt loam, loam, sandy loam
Clay content--6 to 18 percent
Total rock fragment content--0 to 35 percent
Gravel content--0 to 30 percent
Cobble content--0 to 15 percent
Reaction--4.5 to 5.5
Thickness--10 to 20 cm
Bg1 horizon
Value--4 or 5 dry or moist
Chroma--1 or 2 dry or moist
Fine-earth texture--silt loam, loam, sandy loam
Clay content--6 to 18 percent
Total rock fragment content--0 to 35 percent
Gravel content--0 to 30 percent
Cobble content--0 to 15 percent
Reaction--4.5 to 5.5
Thickness--15 to 30 cm
Bg2, Bg3, and Bg4 horizons
Hue--10YR or 2.5Y
Value--4 or 5 dry or moist
Chroma--2 or 3 dry, 1 or 2 moist
Fine-earth texture--silt loam, loam, sandy loam
Clay content--6 to 18 percent
Total rock fragment content--35 to 60 percent
Gravel content--25 to 55 percent
Cobble content--0 to 20 percent
Stone content--0 to 15 percent
Reaction--4.5 to 5.5
Combined thickness--more than 100 cm
COMPETING SERIES: None
GEOGRAPHIC SETTING:
Elevation--900 to 1900 m
Climate--cool, dry summers; cold, wet winters
Mean annual precipitation--1500 to 4000 mm
Mean annual air temperature--0 to 6 degrees C
Frost-free period--30 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Ignarcreek, Nonamecreek--well drained, albic and spodic horizons; glacial valley walls and colluvial aprons
Mountmystery,
Grandpass,
Hungrycreek--well drained; glacial valley walls and colluvial aprons
Allincreek, Cultuscreek, Mountfromme--well drained, lithic contact within 25 to 50 cm of the soil surface; structural benches and cirques
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--poorly drained
Saturation in normal years--above the surface November through June, seasonally high water table top depth of 0 to 25 cm July through October
Flooding--none
Ponding--occasional, brief
Saturated hydraulic conductivity (Ksat)--high or very high throughout
USE AND VEGETATION:
Use--wildlife habitat, recreation
Potential natural vegetation--stika alder, western mountain ash, stinging nettle, common cowparsnip, salmonberry, green false hellebore, 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 lake Dilly 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
*Aquic conditions--zone from 13 to 150 cm
*Redox concentrations--zone from 13 to 150 cm
National Cooperative Soil Survey
U.S.A.