LOCATION MOUNTMEANY WA
Tentative Series
IRD. AJF/MGR/MPR
01/2025
MOUNTMEANY SERIES
Landscape--river valleys
Landform--alluvial terraces
Slope--0 to 15 percent
Parent material--alluvium
Mean annual precipitation--about 2500 mm
Mean annual air temperature-- about 12 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--isomesic
Soil moisture subclass--typic
TAXONOMIC CLASS: Coarse-loamy, mixed, active, isomesic Typic Humudepts
TYPICAL PEDON: Mountmeany silt loam on a forested alluvial terrace with a slope of 1 percent and an elevation of 105 m. (The soil was moist throughout when described.)
Oi--0 to 5 cm; slightly decomposed plant material; clear wavy boundary
A--5 to 17 cm; dark grayish brown (10YR 4/2) dry, very dark grayish brown (10YR 3/2); loam; moderate fine granular structure; soft, very friable, slightly sticky, slightly plastic; weakly smeary; many very fine and fine, and common medium, coarse, and very coarse roots; common very fine and fine irregular, and few fine tubular pores; very strongly acid (pH 4.9); clear smooth boundary
AB--17 to 32 cm; brown (10YR 4/3) dry, dark brown (10YR 3/3); silt loam; weak fine subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; weakly smeary; common fine and few medium and very fine roots; few fine irregular and tubular pores; very strongly acid (pH 5.0); clear smooth boundary
Bw1--32 to 81 cm; brown (10YR 5/3) dry, brown (10YR 4/3); loam; weak medium subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; few fine and medium roots; few fine and very fine tubular pores; very strongly acid (pH 5.1); clear smooth boundary
Bw2--81 to 150 cm; dark grayish brown (10YR 4/2) dry, very dark grayish brown (10YR 3/2); gravelly loam; weak fine subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; few fine roots; few very fine and fine interstitial pores; 25 percent gravel, 5 percent cobbles; very strongly acid (pH 5.3); clear smooth boundary
TYPE LOCATION: Olympic National Park, Jefferson County, Washington; North Fork Road, approximately 50 meters south of the road and 300 meters east of Finley Creek
Latitude--47.509641
Longitude-- -123.80241
Datum--WGS84
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--10 to 15 degrees C
Mean summer soil temperature--12 to 17 degrees C
Umbric epipedon thickness--20 to 30 cm
Particle-size control section
*Clay content--8 to 17 percent
*Total rock fragment content--20 to 50 percent
*Gravel content--15 to 45 percent
*Cobble content--0 to 10 percent
Oi horizon
Horizon thickness--2 to 10 cm
A and AB horizon
Value--3 or 4 dry; 2 or 3 moist
Chroma--1 to 3 moist or dry
Fine-earth texture--silt loam, loam
Clay content--8 to 17 percent
Reaction--4.5 to 5.5
Combined thickness--20 to 30 cm
Bw1 horizon
Value--3 to 5 moist or dry
Chroma--2 or 3 moist or dry
Fine-earth texture--silt loam, loam, sandy loam
Clay content--8 to 17 percent
Reaction--4.5 to 5.5
Thickness--30 to 40 cm
Bw2 horizon
Value--3 to 5 moist or dry
Chroma--1 or 2 moist or dry
Fine-earth texture--loam, sandy loam
Clay content--8 to 17 percent
Total rock fragment content--30 to 60 percent
Gravel content--25 to 50 percent
Cobble content--0 to 10 percent
Reaction--4.5 to 5.5
Thickness--80 to 100 cm
COMPETING SERIES: None
GEOGRAPHIC SETTING:
Elevation--50 to 300 m
Climate--warm, moist summers; mild, wet winters
Mean annual precipitation--2000 to 3000 mm
Mean annual air temperature--10 to 14 degrees C
Frost-free period--180 to 240 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Hatana--has cambic horizon; occurs on similar landforms with less frequent flooding interval
Cragcreek--has umbric epipedon and cambic diagnostic horizon; occurs on similar landforms with less frequent flooding interval
Rica--has aquic conditions within 50 cm of the mineral soil surface; occurs on depressions on similar landforms
Muscott--has sandy-skeletal particle size class; occurs on similar landforms with more frequent flooding
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 and recreation
Potential natural vegetation--Sitka spruce, western hemlock, red alder, western swordfern, salmonberry, red huckleberry, oval-leaf huckleberry, Oregon oxalis, western cordilleran bunchberry
DISTRIBUTION AND EXTENT: Olympic Mountains and Coast, Washington; MLRA's 1 and 4a; moderate extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Olympic National Park, Jefferson County, Washington 2023; name from Mount Meany in Olympic National Park
REMARKS:
Diagnostic horizons and other features in this pedon
*Particle-size control section--zone from 30 to 105 cm
*Umbric epipedons--zone from 5 to 32 cm
*Cambic diagnostic horizon--zone from 32 to 61 cm
National Cooperative Soil Survey
U.S.A.