LOCATION DUTCHOVEN OR
Tentative Series
DCR/MPR
01/2025
DUTCHOVEN SERIES
Landscape--central western Cascade mountains
Landform--mountain slopes
Slope--30 to 90 percent
Parent material--colluvium derived from volcanic rocks
Mean annual precipitation--about 1700 mm
Mean annual air temperature--about 8.5 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--mesic
Soil moisture subclass--typic
TAXONOMIC CLASS: Loamy-skeletal, isotic, mesic Andic Humudepts
TYPICAL PEDON: Dutchoven very gravelly loam, on a north-facing mountain slope with a slope of 50 percent and an elevation of 549 m
Oi--0 to 5 cm; slightly decomposed plant material; abrupt smooth boundary
A1--5 to 13 cm; very gravelly loam, very dark grayish brown (10YR 3/2) dry, very dark brown (10YR 2/2) moist; moderate fine granular structure; soft, very friable, slightly sticky, slightly plastic; many very fine and common fine through coarse roots; many very fine interstitial pores; 55 percent gravel and 2 percent cobbles; strongly acid (pH 5.2); abrupt wavy boundary
A2--13 to 38 cm; gravelly loam, dark grayish brown (10YR 4/2) dry, very dark grayish brown (10YR 3/2) moist; moderate fine subangular blocky structure; slightly hard, very friable, slightly sticky, moderately plastic; common very fine, medium, and coarse and few fine roots; many very fine dendritic tubular pores; 30 percent gravel and 2 percent cobbles; strongly acid (pH 5.4); clear wavy boundary
BA--38 to 90 cm; very gravelly loam, grayish brown (10YR 5/2) dry, dark yellowish brown (10YR 3/4) moist; weak very fine subangular blocky structure; slightly hard, very friable, slightly sticky, moderately plastic; common very fine, medium, and coarse roots; common very fine dendritic tubular pores; 50 percent gravel and 5 percent cobbles; moderately acid (pH 5.6); gradual wavy boundary
Bw--90 to 150 cm; very gravelly loam, grayish brown (10YR 5/2) dry, brown (10YR 4/3) moist; weak very fine subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; common medium and coarse and few very fine roots; common very fine dendritic tubular pores; 40 percent gravel and 10 percent cobbles; moderately acid (pH 5.6)
TYPE LOCATION: Lane County, Oregon, about 15 km east of Lowell in Willamette National Forest; 50 m north and 610 m east of the southwest corner of section 20, T. 19 S., R. 2 E., Willamette Meridian; latitude 43.89526, longitude -122.59940, datum WGS 84 (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--8 to 11 degrees C
Thickness of umbric epipedon--25 to 50 cm
Hue--10YR or 7.5YR
Fine-earth texture--loam, silt loam
Clay content--18 to 27 percent
Sand content--25 to 50 percent
Reaction--pH 5.1 to 6.0
Properties of layers meeting andic subgroup criteria
*1/3-bar bulk density--0.70 to 1.0 g/cm3
*Phosphate retention--50 to 100 percent
*Ammonium oxalate extractable Al plus 1/2 Fe--1 to 2 percent
*Volcanic glass content in the coarse silt fraction--5 to 10 percent
*Thickness--18 to 50 cm
Oi horizon
*Thickness--0 to 6 cm
A horizons
*Value--2 or 3 moist, 3 to 5 dry
*Chroma--2 or 3 moist and dry
*Total fragment content--25 to 70 percent
*Gravel content--25 to 60 percent
*Cobble content--0 to 15 percent
*Combined thickness--18 to 50 cm
BA horizon
*Value--3 or 4 moist, 5 or 6 dry
*Chroma--2 to 4 moist and dry
*Total fragment content--35 to 60 percent
*Gravel content--35 to 55 percent
*Cobble content--0 to 15 percent
*Thickness--25 to 50 cm
Bw horizon
*Value--3 to 5 moist, 5 to 7 dry
*Chroma--2 to 4 moist and dry
*Total fragment content--35 to 60 percent
*Gravel content--35 to 55 percent
*Cobble content--0 to 15 percent
COMPETING SERIES:
Aschoff--contains greater than 15 percent cobbles below the epipedon
Cascadia--50 to 100 cm to lithic contact
Damewood--50 to 100 cm to lithic contact
Hoodview--thickness of the umbric epipedon is 50 to 100 cm
Nordby--sandy fine-earth textures within the particle-size control section
GEOGRAPHIC SETTING:
Elevation--240 to 910 m
Climate--warm, dry summers; mild, moist winters
Mean annual precipitation--1500 to 1900 mm
Mean annual air temperature--7 to 10 degrees C
Frost-free period--120 to 180 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Kinney--averages less than 35 percent fragments in the particle-size control section; located on mountain slopes
Westfir--50 to 100 cm to paralithic contact; located on mountain slopes
Dorena--fine particle-size class family, contains an argillic horizon; located on complex landslides
Mooseridge--50 to 100 cm to aquic conditions; located on complex landslides
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high
USE AND VEGETATION:
Use--timber production, recreation, wildlife habitat
Potential natural vegetation--Douglas-fir, western hemlock, bigleaf maple, Cascade barberry, salal, western swordfern; commonly supports a western hemlock/dwarf Oregon grape/western swordfern (CHS164) plant association (see Field Guide to the Forested Plant Associations of the Westside Central Cascades of Northwest Oregon)
DISTRIBUTION AND EXTENT: Central western Oregon Cascade Mountains, Oregon; MLRA 3; moderate extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Willamette National Forest, Lane County, Oregon; 2022; name from Dutchoven Campground located several miles south of the type location
REMARKS:
Diagnostic horizons and other features in this pedon
*Particle-size control section--zone from 30 to 105 cm
*Umbric epipedon--zone from 5 to 38 cm
*Andic subgroup feature--zone from 5 to 38 cm
*Cambic horizon--zone from 38 to 150 cm
ADDITIONAL DATA: Type location user pedon ID--2019OR039765
National Cooperative Soil Survey
U.S.A.