LOCATION WALDOR OR
Tentative Series
IRD. DCR/MPR
02/2025
WALDOR SERIES
Landscape--Mazama High Cascade mountains
Landform--glaciated mountains
Slope--2 to 15 percent
Parent material-- pumice and coarse volcanic ash over till mixed with volcanic ash
Mean annual precipitation--about 1600 mm
Mean annual air temperature--about 4 degrees C
Depth class--moderately deep to densic contact
Drainage class--moderately well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--aquic
TAXONOMIC CLASS: Pumiceous or ashy-pumiceous over medial, amorphic Aquandic Haplocryods
TYPICAL PEDON: Waldor loamy coarse sand, forested, with a slope of 5 percent and an elevation of 1732 m
Oi--0 to 2 cm; slightly decomposed plant material; abrupt smooth boundary
Oe--2 to 5 cm; moderately decomposed plant material; many very fine and common fine and medium roots; abrupt smooth boundary
E--5 to 7 cm; loamy coarse sand, gray (10YR 6/1) dry, dark grayish brown (10YR 4/2) moist; weak thick platy structure; soft, very friable, nonsticky, nonplastic; common very fine through medium roots; many very fine interstitial pores; 3 percent pumice paragravel; very strongly acid (pH 4.8); abrupt wavy boundary
Bs--7 to 18 cm; ashy loamy coarse sand, brown (7.5YR 5/4) dry, brown (7.5YR 4/3) moist; weak fine subangular blocky structure; soft, very friable, nonsticky, nonplastic; many very fine and common fine through coarse roots; many very fine interstitial pores; 10 percent pumice paragravel; moderately acid (pH 5.6); clear wavy boundary
BC --18 to 39 cm; very paragravelly ashy loamy coarse sand, light yellowish brown (10YR 6/4) dry, brown (10YR 4/3) moist; weak coarse subangular blocky structure; soft, very friable, nonsticky, nonplastic; common very fine through medium and few coarse roots; many very fine interstitial pores; 40 percent pumice paragravel; moderately acid (pH 5.9); clear wavy boundary
C--39 to 59 cm; very paragravelly ashy coarse sand, light yellowish brown (10YR 6/4) dry, brown (10YR 4/3) moist; single grain; soft, very friable, nonsticky, nonplastic; few very fine, medium, and coarse roots; many fine interstitial pores; 50 percent pumice paragravel; slightly acid (pH 6.2); abrupt smooth boundary
2Bw--59 to 93 cm; cobbly medial loam, brown (10YR 5/3) dry, dark yellowish brown (10YR 3/4) moist; weak very thick platy structure; hard, firm, nonsticky, slightly plastic; common very fine and few medium roots; common very fine dendritic tubular pores; 2 percent dark grayish brown (10YR 4/2), moist, iron depletions and 5 percent brown (7.5YR 4/4), moist, iron-manganese masses; 2 percent very pale brown (10YR 7/4), moist, threadlike silica masses on surfaces along root channels; 5 percent basalt gravel, 12 percent basalt cobbles; slightly acid (pH 6.2); gradual smooth boundary
2Cd--93 to 150 cm; loam, gray (N 5/), dry, very dark gray (2.5Y 3/1) moist; massive; very hard, very firm, noncoherent; few very fine dendritic tubular pores; 2 percent very pale brown (10YR 7/4), moist, silica coats on bottom surfaces of fragments; 3 percent very fine threadlike very pale brown (10YR 7/4), moist, silica masses on surfaces along root channels; 5 percent basalt gravel, 3 percent basalt cobbles; slightly acid (pH 6.4)
TYPE LOCATION: Lane County, Oregon, about 1.5 km east of Waldo Lake in Willamette National Forest; 150 m north and 150 m west of the southeast corner of section 5, T. 22 S., R. 6 E., Willamette Meridian; latitude 43.68839, longitude -122.02410, datum WGS 84 (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--4 to 6 degrees C
Depth to aquic conditions--50 to 75 cm
Depth to densic contact--75 to 100 cm
Depth to lithologic discontinuity--50 to 75 cm below the mineral soil surface
Particle-size control section (upper part)
*Clay content--0 to 5 percent
*Volcanic glass content in 0.02 to 2.0 mm fraction--60 to 90 percent
*Fine-earth fraction--contains more than 50 percent medium through very coarse sand
*1500 kPa water (air-dried samples)--5 to 12 percent
*1500 kPa water (undried)--10 to 20 percent
*1/3-bar bulk density--0.6 to 0.9 g/cm3
Particle-size control section (lower part)
*Clay content--5 to 18 percent
*1/3-bar bulk density--1.0 to 1.4 g/cm3
*Phosphate retention--greater than 85 percent
*Ammonium oxalate Al plus 1/2Fe--2 to 4 percent
*1500 kPa water (air-dried samples)--greater than 15 percent
*1500 kPa water (undried)--20 to 30 percent
*0.02 to 2.0 mm fraction--greater than 30 percent
*Volcanic glass content in 0.02 to 2.0 mm fraction--30 to 60 percent
O horizon(s)
*Composition--slightly to moderately decomposed plant material
*Combined thickness--3 to 8 cm
E horizon
*Value--4 or 5 moist, 6 or 7 dry
*Chroma--1 or 2 moist and dry
*Pumice paragravel content--0 to 35 percent
*Reaction--pH 4.5 to 5.0
*Phosphate retention--less than 25 percent
*Ammonium oxalate Al plus 1/2Fe--less than 1 percent
*Thickness--1 to 8 cm
Bs horizon
*Value--4 or 5 moist, 5 or 6 dry
*Chroma--3 or 4 moist and dry
*Pumice paragravel content--5 to 35 percent
*Reaction--pH 5.1 to 5.9
*Phosphate retention--50 to less than 85 percent
*Ammonium oxalate Al plus 1/2 Fe--1 to 3 percent
*Thickness--3 to 15 cm
BC horizon (when present)
*Value--4 or 5 moist, 6 or 7 dry
*Chroma--3 or 4 moist or dry
*Fine-earth texture--ashy loamy coarse sand, ashy coarse sand
*Pumice paragravel content--35 to 60 percent
*Reaction--pH 5.6 to 6.5
*Phosphate retention--50 to less than 85 percent
*Ammonium oxalate Al plus 1/2 Fe--1 to 3 percent
*Thickness--0 to 30 cm
C horizon
*Value--4 or 5 moist, 6 or 7 dry
*Chroma--3 or 4 moist or dry
*Pumice paragravel content--35 to 80 percent
*Reaction--pH 6.1 to 6.5
*Phosphate retention--50 to less than 85 percent
*Ammonium oxalate Al plus 1/2 Fe--1 to 3 percent
*Thickness--15 to 30 cm
2Bw horizon
*Hue--10YR or 2.5Y
*Value--3 or 4 moist, 5 or 6 dry
*Chroma--2 to 4 moist or dry
*Fine-earth texture--medial loam, medial sandy loam, medial fine sandy loam
*Total fragment content--5 to 35 percent
*Gravel content--5 to 30 percent
*Cobble content--0 to 15 percent
*Stone content--0 to 5 percent
*1/3-bar bulk density--0.9 to 1.4 g/cm3
*Reaction--pH 6.1 to 6.5
*Thickness--15 to 45 cm
2Cd horizon
*Hue--neutral, 10YR, or 2.5Y
*Value--3 or 4 moist, 5 or 6 dry
*Chroma--0 to 3 moist or dry
*Fine-earth texture--loam, sandy loam, fine sandy loam
*Clay content--5 to 18 percent
*Total fragment content--5 to 35 percent
*Gravel content--5 to 30 percent
*Cobble content--0 to 15 percent
*Stone content--0 to 5 percent
*Reaction--pH 6.1 to 6.5
COMPETING SERIES: None
GEOGRAPHIC SETTING:
Elevation--1520 to 1950 m
Climate--cool, dry summers; cold, wet winters
Mean annual precipitation--1400 to 1900 mm
Mean annual air temperature--3 to 5 degrees C
Frost-free period--30 to 60 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Wilchutes--100 to 150 cm to lithic contact; located on ice-scoured mountains and volcanic cones
Lostwagon--greater than 150 cm to bedrock; located on glacial-valley floors, moraines, glacial-valley walls, and cirque headwalls
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--moderately well drained
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--very high in the upper part and moderately high in the lower part
USE AND VEGETATION:
Use--recreation, wildlife habitat
Potential natural vegetation--mountain hemlock, Pacific silver fir, subalpine fir, grouse whortleberry, pipsissewa; commonly supports a mountain hemlock/grouse whortleberry (CMS118) plant association (see Field Guide to the Forested Plant Associations of the Westside Central Cascades of Northwest Oregon)
DISTRIBUTION AND EXTENT: Mazama High 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 Waldo Lake, Oregon
REMARKS:
Diagnostic horizons and other features in this pedon:
*Particle-size control section--zone from 30 to 93 cm
*Ochric epipedon
*Albic horizon--zone from 5 to 7 cm
*Spodic horizon--zone from 7 to 18 cm
*Depth to lithologic discontinuity--59 cm
*Episaturation--59 to 93 cm
*Cambic horizon--zone from 59 to 93 cm
*Depth to densic contact--93 cm
*Volcanic glass--zone from 5 to 93 cm
*Andic soil properties--zone from 7 to 93 cm
*Aquic conditions--zone from 59 to 93 cm
*Type location user pedon ID--2021OR039798
ADDITIONAL DATA:
Complete Kellogg Soil Survey Laboratory (KSSL) characterization--12N7681
National Cooperative Soil Survey
U.S.A.