LOCATION DOLLARLAKE OR
Established Series
Rev. RJO/JLW/DAL
10/2012
DOLLARLAKE SERIES
The Dollarlake series consists of very deep, well drained soils on mid-backslopes and footslopes of troughwalls in glaciated mountains. Dollarlake soils formed in till from basalt with an influence of volcanic ash. Slopes are 0 to 60 percent. The mean annual precipitation is about 48 inches and the mean annual temperature is about 31 degrees F.
TAXONOMIC CLASS: Loamy-skeletal, isotic Vitrixerandic Humicryepts
TYPICAL PEDON: Dollarlake very cobbly ashy sandy loam, alpine meadow, on a 15 percent southfacing slope at an elevation of 7,920 feet. (Colors are for moist soil unless otherwise noted.)
A1--0 to 10 inches; dark brown (7.5YR 3/2) very cobbly ashy sandy loam, brown (7.5YR 4/3) dry; weak very fine subangular blocky structure; soft, very friable; slightly sticky and nonplastic; many very fine and few fine roots; common fine and few medium irregular pores; 20 percent gravel, 15 percent cobbles, 10 percent stones; slightly acid (pH 6.5); clear wavy boundary.
A2--10 to 17 inches; dark brown (7.5YR 3/2) very gravelly ashy sandy loam, brown (7.5YR 4/3) dry; weak fine subangular blocky structure; soft, friable; slightly sticky and nonplastic; common very fine and fine roots; few fine and very fine tubular pores; 25 percent gravel, 10 percent cobbles and 5 percent stones; moderately acid (pH 6.0); gradual smooth boundary. (combined thickness of the A1 and A2 horizons is 10 to 20 inches thick)
BA--17 to 33 inches; dark brown (7.5YR 3/2) very cobbly sandy loam, brown (7.5YR 4/3) dry; weak medium and fine subangular blocky structure; soft, friable; nonsticky and nonplastic; common fine roots; few very fine tubular pores; 25 percent gravel, 20 percent cobbles, and 5 percent stones; moderately acid (pH 6.0); gradual smooth boundary. (10 to 27 inches thick)
Bw--33 to 61 inches; dark brown (7.5YR 3/2) very gravelly sandy loam, brown (7.5YR 4/3) dry; weak medium subangular blocky structure; soft, friable, slightly sticky and nonplastic; few fine roots; few very fine tubular pores; 25 percent gravel and 10 percent cobbles; slightly acid (pH 6.1).
TYPE LOCATION: Wallowa County, Oregon
Section 26 (SW 1/4, SE 1/4, NW 1/4), T. 4 S., R. 45 E.
Latitude: 45 degrees, 11 minutes, 16 seconds North
Longitude: 117 degrees, 09 minutes, 27 seconds West
USGS Quandrangle: Aneroid Mountain
RANGE IN CHARACTERISTICS:
Soil Temperature: cryic regime
Mean Annual Soil Temperature: 31 to 35 degrees F
Mean Summer Soil Temperature: 36 to 41 degrees F
Mean Winter Soil Temperature: 25 to 30 degrees F
Soil Moisture: xeric regime; dry 45 to 60 consecutive days in summer
Particle-size Control Section: 10 to 40 inches below mineral soil surface
Clay content: 5 to 15 percent
Rock fragment content: 35 to 55 percent
Diagnostic Horizons and Features:
vitrandic subgroup properties: upper boundary at the mineral soil surface; 14 to 20 inches thick
Al+1/2Fe(aox): 0.7 to 1.0 percent
bulk density: 1.0 to 1.3 g/cc
P retention: 60 to 70 percent
glass content in the 0.02-2.0mm fraction: 5 to 25 percent
water content 1500 kPa water (air dried): 5 to 12 percent
8Si + 2Fe (aox): 2 to 4 percent
umbric epipedon: 20 to 40 inches thick with a base saturation(NH4OAc) of 40 to 75 percent . The upper 20 inches has base saturation of 40 to 50 percent and the lower part has base saturation of 50 to 75 percent
Major Horizons:
A1 horizon:
color, moist: 7.5YR 2.5/2, 3/2, 3/3
color, dry: 7.5YR 3/4, 4/3, 4/4
texture: GR-ASHY-SIL, GR-ASHY-SL, CBV-ASHY-SL, CBV-ASHY-SIL
clay content: 5 to 15 percent
rock fragment content: 15 to 55 percent
gravel: 15 to 25 percent
cobbles: 0 to 20 percent
stones: 0 to 10 percent
reaction: moderately acid to slightly acid; pH: 5.6 to 6.5
base saturation(NH4OAc): 40 to 50 percent
A2 horizon:
color, moist: 7.5YR 2.5/2, 3/2, 3/3
color, dry: 7.5YR 3/4, 4/3, 4/4
texture: GR-ASHY-SIL, GRV-ASHY-SL, CBV-ASHY-L
clay content: 5 to 15 percent
rock fragment content: 20 to 55 percent
gravel: 20 to 25 percent
cobbles: 0 to 20 percent
stones: 0 to 10 percent
reaction: moderately acid to slightly acid; pH: 5.6 to 6.5
base saturation(NH4OAc): 40 to 50 percent
BA and Bw horizons:
color, moist: 7.5YR 3/2, 3/3
color, dry: 7.5YR 4/3, 4/4
texture: GRV-SIL, CBV-SL, CBV-SIL, GRV-SL
clay content: 4 to 15 percent
rock fragment content: 35 to 55
gravel: 20 to 35 percent
cobbles: 5 to 20 percent
stones: 0 to 10 percent
reaction: moderately acid to slightly acid; pH: 5.6 to 6.5
base saturation(NH4OAc): 50 to 75 percent
organic matter content is less than 1 percent in the Bw horizon
COMPETING SERIES:
Crocamp: deep to a lithic contact; base saturation (NH4OAc) less than 50 percent in one-half or more of the thickness between 10 to 30 inches (dystric); rock fragments are granitic and metamorphic colluvium;
Fruitcreek: moderately deep to a lithic contact of hard argillite; rock fragments are angular argillite and metasedimentary colluvium;
Granitemountain: base saturation (NH4OAc) less than 50 percent in one-half or more of the thickness between 10 to 30 inches (dystric); rock fragments are subangular or subrounded granitic colluvium;
Leespeak: moderately deep to a lithic contact; base saturation (NH4OAc) less than 50 percent in one-half or more of the thickness between 10 to 30 inches (dystric); rock fragments are subangular or subrounded granitic colluvium;
Toats: ashy loam surface horizons with less than 15 percent rock fragments; base saturation (NH4OAc) less than 50 percent in one-half or more of the thickness between 10 to 30 inches (dystric); rock fragments are rounded granitic and metamorphic colluvium;
GEOGRAPHIC SETTING:
Landform: mid-backslopes to footslopes of troughwalls in glaciated mountains.
Slope gradient: 0 to 60 percent
Parent material: till with and influence of volcaniclastic volcanic ash
Lithology: till from basalt with and influence of Mazama ash
Elevation: 7,200 to 8,500 feet
Climate: cold, wet winters and warm, dry summers
Mean annual precipitation: 40 to 55 inches
Mean annual air temperature: 29 to 33 degrees F
Frostfree period: 10 to 25 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Fruitcreek: on planar backslopes under mountain shrub with widely scattered forest; moderately deep to bedrock;
Hasshollow: on concave glaciated backslopes and footslopes under closed-canopy cold forest; very deep; thick volcanic ash mantle; very deep
DRAINAGE AND PERMEABILITY:
Drainage: well drained
Permeability: moderate
USE AND VEGETATION:
Use: watershed, wildlife habitat, livestock grazing and recreation
Native vegetation: buckwheat, spurred lupine, yarrow, northern linanthus, western mugwort, green fescue and sedges.
Plant associations: Dominant: FEVI/LULA2; may include: FEVI/CAHO
DISTRIBUTION AND EXTENT:
MLRA 10; Central Rocky and Blue Mountain Foothills
Extent: small
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Wallowa-Whitman National Forests, Oregon, 2012
REMARKS: Diagnostic horizons and features recognized in this pedon are:
umbric epipedon: 0 to 33 inches; A1, A2, BA horizons; base saturation is less than 50 percent from 0 to 17 inches (A1 and A2) and over 50 percent from 17 to 33 inches (BA)
cambic horizon: 33 to 61 inches; Bw has color requirement for umbric but lacks the organic matter content
vitrixerandic subgroup properties: 0 to 17 inches; A1, A2 with a xeric soil moisture regime
particle-size control section: 10 to 40 inches; A2, BA, Bw
eutric subgroup properties: base saturation is greater than 50 percent from 17 to 30 inches (more than half the thickness between 10 and 30 inches is over 50 percent)
National Cooperative Soil Survey
U.S.A.