LOCATION DARDRY OR
Established Series
Rev. JLW/RJO/DAL
10/2012
DARDRY SERIES
The Dardry series consists of very deep, well drained soils on high terraces of mountain valley floors and mountain toeslopes. Dardry soils formed in stream alluvium from mixed rocks. Slopes are 0 to 10 percent. Mean annual precipitation is about 26 inches and mean annual temperature about 45 degrees F.
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Cumulic Ultic Haploxerolls
TYPICAL PEDON: Dardry loam - woodland, on a 0 percent slope at an elevation of 3,760 feet. (Colors are for moist soil unless otherwise noted. Soil textures are apparent field textures.)
Oi--0 to 1 inches; slightly decomposed plant material consisting of needles and twigs
A1--1 to 7 inches; black (7.5YR 2.5/1) loam, dark brown (7.5YR 3/2) dry; weak medium and fine subangular blocky structure, parting to weak fine granular; soft, very friable, slightly sticky and slightly plastic; many very fine and few fine roots; few very fine and fine tubular pores; 5 percent gravel, and 5 percent cobbles; slightly acid (pH 6.5); gradual smooth boundary. (5 to 11 inches thick)
A2--7 to 12 inches; very dark brown (7.5YR 2.5/2) very cobbly loam, dark brown (7.5YR 3/2) dry; weak medium and fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine, common fine, few medium and coarse roots; few very fine and fine tubular pores; 20 percent gravel, 10 cobbles, and 5 percent stones; slightly acid (pH 6.3); clear smooth boundary. (5 to 17 inches thick)
AC--12 to 36 inches; very dark brown (7.5YR 2.5/3) extremely cobbly sandy loam, brown (7.5YR 4/3) dry; weak fine subangular blocky structure; soft, very friable, slightly sticky and nonplastic; common very fine and few fine, medium and coarse roots; common very fine irregular pores; 30 percent gravel, 25 percent cobbles, 10 percent stones, and 1 percent boulders; slightly acid (pH 6.5); gradual wavy boundary. (0 to 25 inches thick)
C--36 to 61 inches; dark brown (7.5YR 3/3) extremely cobbly sandy loam, brown (7.5YR 4/4) dry; single grain; loose, nonsticky and nonplastic; few very fine, fine and medium roots throughout; few very fine irregular pores; 35 percent gravel, 25 percent cobbles, 10 percent stones, and 2 percent boulders; slightly acid (pH 6.5).
TYPE LOCATION: Crook County, Oregon
Section 4 (NE , NW , SW ), T. 13 S., R. 17 E.
Latitude: 44 28 05 N, Longitude: 120 42 06 W
UTM Zone 10; 4,926,200 northing; 682,820 easting; NAD27
USGS Quadrangle: Salt Butte
RANGE IN CHARACTERISTICS:
Soil Temperature: frigid regime
Mean Annual Soil Temperature: 44 to 49 degrees F
Mean Summer Soil Temperature: 53 to 61 degrees F
Mean Winter Soil Temperature: 34 to 39 degrees F
Soil Moisture: xeric regime, dry 45 to 75 days in summer
Particle-size control section: 10 to 40 inches below mineral soil surface
Clay content averages: 7 to 18 percent
Rock fragment content averages: 50 to 70 percent
Diagnostic Horizons and Features:
mollic epipedon: 20 to 35 inches thick
Major Horizons:
A1 horizon:
color, moist: 5YR 2.5/1; 7.5YR 2.5/1, 2.5/2; 10YR 2/2
color, dry: 5YR 4/2; 7.5YR 3/2, 3/3, 4/2; 10YR 3/2
texture: L, GR-L, SL
clay content: 12 to 18 percent
rock fragment content: 0 to 25 percent
gravel: 0 to 25 percent
cobbles: 0 to 5 percent
reaction: slightly acid to neutral; pH: 6.1 to 7.3
organic carbon: 1.5 to 4.7 percent
A2 horizon:
color, moist: 7.5YR 2.5/1, 2.5/2, 3/3; 2.5YR 2.5/1, 3/1
color, dry: 7.5YR 3/2, 4/2, 4/3, 4/4
texture: CBV-L, CBX-SL, STX-L
clay content: 5 to 25 percent
rock fragment content: 35 to 65 percent
gravel: 10 to 35 percent
cobbles: 10 to 25 percent
stones: 0 to 20 percent
reaction: slightly acid to neutral; pH: 6.1 to 7.3
organic carbon: 1.5 to 4.7 percent
AC horizon; some pedons have a Bw horizon:
color, moist: 7.5YR 2.5/2, 2.5/3, 3/2, 3/3
color, dry: 7.5YR 4/2, 4/3, 4/4, 5/2; 10YR 5/3
texture: STX-SL, CBX-SL, GRV-SL, CBV-SL
clay content: 5 to 15 percent
rock fragment content: 35 to 70 percent
gravel: 10 to 35 percent
cobbles: 15 to 30 percent
stones: 0 to 20 percent
boulders: 0 to 1 percent
reaction: slightly acid to neutral; pH: 6.1 to 7.3
organic carbon: 0.9 to 1.8 percent
C horizon:
color, moist: 7.5YR 2.5/1, 2.5/2, 3/2, 3/3, 4/3
color, dry: 7.5YR 4/3, 4/4 , 5/2, 5/3
texture: STX-SL, CBX-SL
clay content: 5 to 15 percent
rock fragment content: 65 to 80 percent
gravel: 25 to 45 percent
cobbles: 20 to 35 percent
stones: 5 to 30 percent
boulders: 0 to 2 percent
reaction: slightly acid to neutral; pH: 6.1 to 7.3
organic carbon: 0.3 to 0.6 percent
COMPETING SERIES: There are no other series in the same family.
GEOGRAPHIC SETTING:
Landform: high terraces of mountain valley floors and mountain toeslopes
Slope gradient: 0 to 10 percent
Parent material: alluvium
Lithology: mixed rocks
Elevation: 2,800 to 4,200 feet
Climate: cold, wet winters and warm, dry summers
Mean annual precipitation: 17 to 35 inches
Mean annual air temperature: 42 to 47 degrees F
Frost-free period: 50 to 125 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Bullroar: on relict terraces of mountain valley floors; with a thick mantle of volcanic ash;
Melloe: on low terraces and floodplains of mountain valley floors;
DRAINAGE AND PERMEABILITY:
Drainage: well drained
Permeability: moderate over moderately rapid.
USE AND VEGETATION:
Use: woodland, watershed, wildlife habitat, livestock grazing and recreation
Native vegetation: Douglas fir, ponderosa pine, grand fir, Engelmann spruce, common snowberry, Rocky mountain maple, birchleaf spiraea, side-flowered miterwort, common yarrow, heartleaf arnica, Columbia brome, Kentucky bluegrass, Idaho fescue and elk sedge.
Plant associations: Dominant: PSME/SYAL; may include: PIPO/SYAL, PSME/CAGE, PIPO/CAGE and PIPO/FEID (dry 60 to 75 days in summer)
Moist Phase: Dominant: ABGR/SPBE; may include: ABGR/ACGL, ABGR/SYAL-floodplain and PIEN/BRVU (dry 45 to 60 days in summer)
DISTRIBUTION AND EXTENT:
MLRA 10; Central Rocky and Blue Mountain Foothills
Distribution: Ochoco Mountains of central Oregon, Blue Mountains and Wallowa Mountains of northeastern Oregon
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:
mollic epipedon: 1 to 36 inches; A1, A2, AC
particle-size control section: 11 to 41 inches; A2, AC, C
irregular decrease in organic carbon with depth: inferred from alluvial parent material, fluvial landscape position and dark brown color to depth of 60 inches or more
National Cooperative Soil Survey
U.S.A.