LOCATION MOUNTFROMME WA
Tentative Series
IRD. MGR/AJF/MPR
01/2025
MOUNTFROMME SERIES
Landscape--mountains
Landform--structural bench
Slope--15 to 100 percent
Parent material--residuum
Mean annual precipitation--about 3000 mm
Mean annual air temperature--about 4 degrees C
Depth class--shallow
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Loamy-skeletal, isotic Lithic Dystrocryepts
TYPICAL PEDON: Mountfromme silt loam on a southeast facing, forested structural bench with a slope of 40 percent and an elevation of 1500 m. (The soil was moist throughout when described.)
Oi--0 to 2 cm; slightly decomposed plant material; abrupt wavy boundary
A--2 to 7 cm; dark grayish brown (10YR 4/2) dry, very dark grayish brown (10YR 3/2) silt loam; moderate fine granular structure; soft, very friable, slightly sticky, slightly plastic; common very fine, fine, medium and few coarse and very coarse roots; common fine irregular and tubular pores; 10 percent gravel; very strongly acid (pH 4.6); abrupt wavy boundary
Bw1--7 to 17 cm; brown (10YR 4/3) dry, very dark grayish brown (10YR 3/2) very gravelly silt loam; moderate fine subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; common very fine, fine, and medium and few coarse and very coarse roots; common fine irregular pores; 40 percent gravel; very strongly acid (pH 4.7); clear wavy boundary
Bw2--17 to 30 cm; brown (10YR 4/3) dry, very dark grayish brown (10YR 3/2) very gravelly silt loam; weak fine subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; common very fine, fine, medium, and coarse and few very coarse roots; common fine irregular and interstitial pores; 40 percent gravel, 5 percent cobbles; very strongly acid (pH 4.8); abrupt wavy boundary
R--30 cm; bedrock
TYPE LOCATION: Jefferson County, Washington; near Lake Beauty in Olympic National Park
Latitude--47.6988290
Longitude-- -123.6454410
Datum--WGS84
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--0 to 7 degrees C
Depth to restrictive horizon--25 to 50 cm
Particle-size control section
*Clay content--8 to 18 percent
*Total rock fragment content--35 to 60 percent
*Gravel content--25 to 50 percent
*Cobble content--0 to 20 percent
*Stone content--0 to 15 percent
Oi horizon
Thickness--0 to 4 cm
A horizon
Value--3 or 4 dry or moist
Chroma--2 to 4 dry or moist
Fine-earth texture--silt loam, loam, sandy loam
Clay content--8 to 18 percent
Total rock fragment content--5 to 40 percent
Gravel content--5 to 30 percent
Cobble content--0 to 15 percent
Reaction--4.5 to 5.5
Thickness--4 to 15 cm
Bw1 and Bw2 horizons
Value--3 to 5 dry or moist
Chroma--2 to 4 dry or moist
Fine-earth texture--silt loam, loam, sandy loam
Clay content--8 to 18 percent
Total rock fragment content--35 to 60 percent
Gravel content--25 to 50 percent
Cobble content--0 to 20 percent
Stone content--0 to 15 percent
Reaction--4.5 to 5.5
Combined thickness--15 to 40 cm
COMPETING SERIES:
Discovery--andic soil properties within 10 to 25 cm of the mineral soil surface and particle size control section has 60 to 90 percent rock fragments
Elkhorncrest--andic soil properties within 25 to 50 cm of the mineral soil surface
Luckiamute--particle size control section is 18 to 35 percent clay
Shanty--has a xeric soil moisture regime
Whitecross--has a Hue of 7.5YR or redder throughout
Winberry--has a pH of 5.6 to 6.0 throughout
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:
Grandpass--no lithic contact; similar landforms
Lollah--umbric epipedon, no lithic contact; similar landforms
Hungrycreek--andic soil properties, no lithic contact; similar landforms
Nonamecreek--albic and spodic horizons, andic soil properties, no lithic contact; similar landforms
Lakedilly--aquic conditions within 0 to 25 cm of the mineral soil surface, no lithic contact; 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, Alaska cedar, western hemlock, oval-leaf huckleberry, pink mountain heather, black huckleberry, common beargrass, white avalanche-lily; dry sites may include Lodgepole pine, Douglas-fir, Pacific silver fir, vine maple, common juniper, spreading phlox, broadleaf lupine
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 Mount Fromme in Olympic National Park
REMARKS:
Diagnostic horizons and other features in this pedon:
*Particle-size control section--zone from 2 to 30 cm
*Ochric epipedon
*Cambic horizon--zone from 7 to 30 cm
*Lithic contact--30 cm
National Cooperative Soil Survey
U.S.A.