LOCATION HUMMINGTON OR
Established Series
Rev. PRS/JGM/KMS
02/2025
HUMMINGTON SERIES
Landscape--western Middle Cascade glaciated mountains
Landform--mountains, mountain slopes, cirque headwalls
Slope--5 to 90 percent
Parent material--colluvium derived from volcanic rocks mixed with volcanic ash
Mean annual precipitation--about 2100 mm
Mean annual air temperature--about 6 degrees C
Depth class--moderately deep to lithic bedrock
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Medial-skeletal, amorphic Typic Haplocryands
TYPICAL PEDON: Hummington gravelly medial loam, forested
Oi--0 to 4 cm; loose litter of undecomposed and partially decomposed needles, twigs, and leaves
A1--4 to 14 cm; gravelly medial loam, dark grayish brown (10YR 4/2) dry, very dark brown (10YR 2/2) moist; moderate fine and very fine granular structure; soft, friable, nonsticky and nonplastic; many very fine to medium roots; many very fine irregular pores; 10 percent gravel and 5 percent cobbles; strongly acid (pH 5.4); clear wavy boundary
A2--14 to 29 cm; gravelly medial loam, dark grayish brown (10YR 4/2) dry, very dark grayish brown (10YR 3/2) moist; moderate fine and medium granular structure; soft, friable, nonsticky and nonplastic; many very fine to medium roots; many very fine irregular pores; 15 percent gravel and 5 percent cobbles; strongly acid (pH 5.4); gradual wavy boundary
Bw1--29 to 52 cm; very gravelly medial loam, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; massive; soft, friable, nonsticky and nonplastic; many very fine to medium roots; many very fine irregular pores; 25 percent gravel and 10 percent cobbles; strongly acid (pH 5.5); gradual wavy boundary
Bw2--52 to 83 cm; extremely cobbly medial loam, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; massive; soft, friable, slightly sticky and slightly plastic; few very fine to medium roots; many very fine irregular pores; 40 percent cobbles and 35 percent gravel; strongly acid (pH 5.2); abrupt irregular boundary
R--83 cm; basalt
TYPE LOCATION: Douglas County, Oregon, near Mud Lake, along the divide between North and South Umpqua Rivers in Umpqua National Forest; in the northeast quarter of the southeast quarter of section 30, T. 27 S., R. 3 E., Willamette Meridian; latitude 43.1892 degrees, longitude -122.5010, datum WGS 84 (coordinates estimated from PLSS details)
RANGE IN CHARACTERISTICS:
Dry days--less than 45 consecutive days following summer solstice
Mean annual soil temperature--4 to 8 degrees C
Depth to lithic contact--50 to 100 cm below mineral soil surface
Thickness of umbric epipedon--50 to 100 cm
Organic carbon content--averages less than 6.0 percent in the upper 30 cm of the epipedon
Hue--10YR, 7.5YR
Clay content--7 to 18 percent
Fine-earth texture--medial loam, medial sandy loam
Reaction--pH 4.5 to 6.0
Estimated properties of layers with andic soil properties
*Ammonium oxalate extractable Al plus 1/2 Fe--2.0 to 4.0 percent
*Particles 0.02- to 2.0-mm diameter--greater than 30 percent of the fine-earth fraction
*Volcanic glass content in 0.02- to 2.0-mm fraction--5 to 30 percent
*Phosphate retention--85 to 100 percent
*15-bar water retention--30 to 70 percent (undried samples), greater than 15 percent (dried samples)
*1/3-bar bulk density--0.50 to 0.90 g/cm3
*Thickness of andic soil properties--50 to 100 cm
O horizons
*Composition--slightly to moderately decomposed plant material
*Combined thickness--0 to 10 cm
A horizons
*Value--2 to 3 moist, 4 or 5 dry
*Chroma--2 or 3 moist or dry
*Total fragment content--15 to 60 percent
*Gravel content--10 to 60 percent
*Cobble content--0 to 10 percent
*Pumice paragravel content--0 to 15 percent
*Combined thickness--25 to 50 cm
Bw horizons
*Value--3 or 4 moist, 4 or 5 dry
*Chroma--2 to 4 moist or dry
*Total fragment content--35 to 75 percent
*Gravel content--15 to 50 percent
*Cobble content--5 to 55 percent
*Stone content--0 to 5 percent
*Combined thickness--25 to 75 cm
COMPETING SERIES:
Battleax --greater than 150 cm deep to bedrock
Divers--greater than 150 cm deep to bedrock
Idanha--greater than 150 cm deep to bedrock
Oatman--greater than 150 cm deep to bedrock
Highcamp--greater than 100 cm deep to bedrock
Holderman--ochric epipedon
Otwin--ochric epipedon
Icecap--umbric epipedon less than 50 cm thick
Ohana--50 to 100 cm to densic material
GEOGRAPHIC SETTING:
Elevation--900 to 1950 m
Climate--cold, wet winters; mild, dry summers
Mean annual precipitation--1500 to 3100 mm
Mean annual air temperature--3 to 7 degrees C
Frost-free period--45 to 105 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Cruiser--greater than 100 cm deep to bedrock; contains less than 35 percent rock fragments in particle-size control section; located on uplands
Holderman--ochric epipedon; located on mountains
Keel--umbric epipedon less than 50 cm thick; less than 35 percent rock fragments in particle-size control section; located on mountains
Snowlin--less than 35 percent rock fragments in particle-size control section; located on mountains, commonly on slopes of less than 40 percent
Whitehorse--medial over loamy; located on mountains and commonly supporting meadow vegetation
Winberry--25 to 50 cm to lithic contact; located on mountains
Yellowstone--25 to 50 cm to lithic contact; located on mountains
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturation in normal years--none within profile
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high
USE AND VEGETATION:
Use--timber production, wildlife habitat, recreation
Vegetation--Douglas-fir, noble fir, mountain hemlock, Pacific silver fir, vine maple, Pacific rhododendron, thinleaf huckleberry, redwood-sorrel
DISTRIBUTION AND EXTENT: West side of central and southern Cascade Range, Oregon; MLRA 3; moderate extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Douglas County, Oregon; 1974
REMARKS:
Diagnostic horizons and features recognized in this pedon
*Particle-size control section--zone from 4 to 83 cm
*Umbric epipedon--zone from 4 to 83 cm
*Andic soil properties--zone from 4 to 83 cm
*Volcanic glass--zone from 4 to 83 cm
*Depth to lithic contact--83 cm
*Some pedons contain appreciable amounts of pumice in the upper 25 to 38 cm
09/2023--all mineral horizons meet criteria #2 (no ash required) and #3 for andic soil properties in the 13th edition of Keys to Soil Taxonomy.
08/2016--this series was reclassified from Dystric Cryandepts to Typic Fulvicryands when the Andisol soil order was established in the 4th edition of Soil Taxonomy. The organic matter content is too low in the data for the Hummington soils in NASIS, in the Hummington soils in the Douglas County soil survey manuscript, and in the Hummington sample pedon to support the Fulvicryand great group. The Hummington soils need to be investigated further; however, given observations in the Willamette National Forest, it is believed that they will not meet the criteria for Fulvicryands. These soils were reclassified as Typic Haplocryands.
More investigation is needed to confirm that the zone from 25 to 50 cm has 2.0 cmol of Al (1n KCL).
ADDITIONAL DATA:
Characterization data--pedon S75OR-39-11(1-5), Kellogg Soil Survey Laboratory, Lincoln, Nebraska; partial characterization data by Oregon State University reported in the Soil Survey of South Umpqua Area, Oregon, and sample RZ91-OR077-247, 248 from Douglas County, Oregon, Kellogg Soil Survey Laboratory, Lincoln, Nebraska, 6/1991
National Cooperative Soil Survey
U.S.A.