LOCATION VENA OR
Established Series
Rev. AON/TDT
02/2025
VENA SERIES
Landscape--southwestern Middle Cascade mountains
Landform--mountain slopes, mountains, south-facing side slopes and headwalls on mountains
Slope--20 to 100 percent
Parent material--residuum and colluvium derived from tuff
Mean annual precipitation--about 1400 mm
Mean annual air temperature--about 9 degrees C
Depth class--moderately deep to lithic contact
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--mesic
Soil moisture subclass--typic
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic Typic Dystroxerepts
TYPICAL PEDON: Vena gravelly loam, forested
Oi--0 to 3 cm; slightly decomposed plant material
A--3 to 18 cm; gravelly loam, gray (10YR 6/1) dry, very dark grayish brown (10YR 3/2) moist; weak fine granular structure; soft, very friable, nonsticky, nonplastic; many very fine to medium roots; many very fine irregular pores; 20 percent gravel and 5 percent cobbles; moderately acid (pH 5.6); clear smooth boundary
Bw1--18 to 28 cm; very gravelly loam, light gray (10YR 7/1) dry, dark grayish brown (10YR 4/2) moist; weak fine and medium granular structure; soft, very friable, nonsticky, nonplastic; many very fine to coarse roots; many very fine irregular pores; 35 percent gravel and 15 percent cobbles; moderately acid (pH 6.0); clear smooth boundary
Bw2--28 to 58 cm; very gravelly loam, light gray (10YR 7/1) dry, grayish brown (10YR 5/2) moist; weak fine subangular blocky structure; soft, very friable, nonsticky, nonplastic; many very fine to medium roots; many very fine irregular pores; 40 percent gravel and 15 percent cobbles; strongly acid (pH 5.5); abrupt wavy boundary
R--58 cm; fractured rhyolite
TYPE LOCATION: Umpqua National Forest, Douglas County, Oregon; NE1/4 NW1/4 section 30, T. 28 S., R. 2 E., Willamette Meridian; Acker Rock, Oregon, U.S. Geological Survey quadrangle; latitude 43.11000 degrees north, longitude 122.63000 degrees west, datum WGS 84 (coordinates estimated from PLSS description)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--8 to 11 degrees C
Moisture control section--usually moist, but dry in all parts 60 to 90 consecutive days following the summer solstice
Depth to lithic contact--50 to 100 cm (below the mineral soil surface)
Reaction --pH 5.1 to 6.5
Particle-size control section (weighted average)
*Clay content--10 to 18 percent
*Total fragment content--35 to 80 percent
Oi horizon
*Thickness--0 to 6 cm
A horizon
*Value--2 to 4 moist, 4 to 6 dry
*Chroma--1 to 4 moist and dry
*Total fragment content--15 to 60 percent
*Gravel content--15 to 50 percent
*Cobble content--0 to 20 percent
*Thickness --8 to 25 cm thick
Bw horizons
*Value--4 or 5 moist, 6 to 8 dry
*Chroma--1 to 4 moist and dry
*Total fragment content--40 to 80 percent
*Gravel content--25 to 60 percent
*Cobble content--5 to 30 percent
*Thickness--25 to 75 cm thick
COMPETING SERIES :
Atring--50 to 100 cm to paralithic contact
Barpeak--greater than 150 cm to bedrock
Beekman --18 to 30 percent clay in the particle-size control section
Farber--greater than 150 cm to bedrock
Forgay--greater than 150 cm to bedrock
Geppert--particle-size control section averages 25 to 35 percent clay
Hartless--greater than 100 cm to paralithic contact; hue of 7.5YR or 5YR in cambic horizon
Hilltish--fragments are rounded; 50 to 100 cm to conglomerate bedrock (lithic contact)
Kanid--100 to 150 cm to paralithic contact
Rockyglen--greater than 150 cm to bedrock
Straight--50 to 100 cm to paralithic contact
Woodin--dry for more than 90 consecutive days in the moisture control section; mean annual soil temperature is 12 to 15 degrees C
GEOGRAPHIC SETTING:
Elevation--240 to 1225 m
Climate--cool wet winters and warm dry summers
Mean annual precipitation--1000 to 1500 mm
Mean annual air temperature--7 to 11 degrees C
Mean July temperature--about 18 degrees C
Mean January temperature-- -4 to 0 degrees C
Frost -free period--100 to 180 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Acker--argillic horizon, greater than 150 cm to bedrock; located on hillslopes, broad ridgetops, and sideslopes of mountains
Chamate--greater than 150 cm to bedrock; located on mountain slopes
Gustin--fine textured argillic horizon, depth to redox depletions is 25 to 50 cm, udic soil moisture regime; located on footslopes, benches, and mountain sideslopes
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturation in normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high
USE AND VEGETATION:
Use--timber production, water supply, wildlife, recreation
Potential native vegetation--Douglas-fir, Pacific madrone, sugar pine, giant chinquapin, Pacific rhododendron, salal, oceanspray, red huckleberry, Saskatoon serviceberry, Cascade barberry, common whipplea, western fescue
DISTRIBUTION AND EXTENT: West side of Central-southern Cascade Mountains, Oregon (MLRA 3, 5); moderate extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Douglas County, Oregon, 1974.
REMARKS:
Diagnostic horizons and other features in this pedon
*Particle-size control section--zone from 28 to 58 cm
*Ochric epipedon
*Cambic horizon--zone from 18 to 58 cm
*Depth to lithic contact--58 cm
*OSD description updated 3/2024. Location description has been copied from Vena OSD version 01/2000. Changed BC horizon to a Bw horizon. Increased maximum mean annual air temperature and frost free days based on new mapping in Willamette National Forest (OR657). Limited fine-earth texture to loam (fine sandy loam had been allowed previously). Fine sandy loam is noted only in the unpublished South Umpqua Area manuscript. Vena in Douglas County (OR649) does not include this texture, neither has it been observed in Willamette National Forest.
*Classification updated 1/00 from Dystric Xerochrepts to Typic Dystroxerepts based on amendment to Soil Taxonomy.
ADDITIONAL DATA:
*Partial characterization data by Oregon State University reported in the Soil Survey of the South Umpqua Area, Oregon, 1973.
National Cooperative Soil Survey
U.S.A.