LOCATION ALOHA                   OR

Established Series
Rev. GEO/JGM/EED
12/2017

ALOHA SERIES

Landscape--Willamette Valley
Landform--terraces
Slope--0 to 8 percent
Parent material--stratified glaciolacustrine deposits from the Missoula Floods
Mean annual precipitation--about 1300 mm
Mean annual air temperature--about 11 degrees C
Depth class--very deep
Drainage class--somewhat poorly drained
Soil moisture regime--xeric
Soil temperature regime--mesic
Soil moisture subclass--aquic

TAXONOMIC CLASS: Fine-silty, mixed, superactive, mesic Aquic Haploxerepts

TYPICAL PEDON: Aloha silt loam, cultivated

Ap--0 to 20 cm; silt loam, pale brown (10YR 6/3) dry, dark brown (10YR 3/3) moist; moderate fine subangular blocky structure; slightly hard, friable, nonsticky and slightly plastic; common very fine roots; common fine irregular pores; common fine shot; moderately acid (pH 6.0); abrupt smooth boundary

BAg--20 to 38 cm; silt loam, light yellowish brown (10YR 6/4) dry, brown (10YR 4/3) moist; moderate fine subangular blocky structure; moderately hard, friable, slightly sticky and slightly plastic; common fine roots; many very fine tubular pores; 5 percent medium faint dark brown (7.5YR 3/2) masses of oxidized iron on surfaces along pores and 10 percent medium faint brown (10YR 5/3) and dark grayish brown (10YR 4/2) iron depletions on surfaces along pores; moderately acid (pH 5.8); clear smooth boundary

Btg--38 to 56 cm; silt loam, pale brown (10YR 6/3) dry, dark yellowish brown (10YR 4/4) moist; moderate fine subangular blocky structure; hard, firm, slightly sticky and slightly plastic; common fine roots; many very fine to medium tubular pores; 2 percent faint clay films on surfaces along pores and 2 percent faint organic stains on vertical faces of peds; 5 percent fine faint dark brown (7.5YR 3/2) masses of oxidized iron on surfaces along pores and 10 percent fine faint brown (10YR 5/3) and dark grayish brown (10YR 4/2) iron depletions on surfaces along pores; few medium shot; moderately acid (pH 5.8); clear wavy boundary

Bg1--56 to 79 cm; silt loam, pale brown (10YR 6/3) dry, dark yellowish brown (10YR 4/4) moist; weak medium subangular blocky structure parting to moderate fine subangular blocky; hard, firm, slightly sticky and slightly plastic; brittle; few very fine roots; many very fine and few fine tubular pores; 10 percent distinct organic stains on vertical faces of peds and surfaces along pores; 10 percent medium distinct dark yellowish brown (10YR 3/4) masses of oxidized iron on surfaces along pores and 15 percent medium distinct dark gray (10YR 4/1) and brown (7.5YR 4/2) iron depletions on surfaces along pores; common fine shot; moderately acid (pH 5.8); gradual wavy boundary

Bg2--79 to 117 cm; silt loam, pale brown (10YR 6/3) dry, variegated brown (10YR 5/3) and brown (10YR 4/3) moist; weak coarse subangular blocky structure; hard, firm, slightly sticky and slightly plastic; brittle; few very fine roots; many very fine and few fine tubular pores; 5 percent distinct organic stains on vertical faces of peds and 60 percent faint sand and silt coatings on all faces of peds; 15 percent fine distinct reddish brown (5YR 4/4) masses of oxidized iron on surfaces along pores and 20 percent medium faint dark grayish brown (10YR 4/2) iron depletions on surfaces along pores; common fine shot; common micaceous fragments; moderately acid (pH 5.8); gradual wavy boundary

Bg3--117 to 152 cm; silt loam, pale brown (10YR 6/3) and yellowish brown (10YR 5/4) dry, dark yellowish brown (10YR 3/4) moist; massive; hard, firm, slightly sticky and slightly plastic; brittle; many fine and very fine tubular pores and few coarse irregular pores; 2 percent distinct organic stains on vertical faces of peds; 10 percent coarse distinct dark grayish brown (10YR 4/2) iron depletions infused into matrix adjacent to pores; moderately acid (pH 6.0); gradual irregular boundary

2C--152 to 165 cm; light yellowish brown (10YR 6/4) very fine sandy loam, dark yellowish brown (10YR 4/4) moist; massive; slightly hard, friable, nonsticky and nonplastic; many very fine irregular pores; common firm nodules; moderately acid (pH 6.0)

TYPE LOCATION: Washington County, Oregon, about 60 m south of 12 m east of the end of the country road; NW1/4SW1/4NW1/4 of section 16, T. 1 S., R. 2 W.; latitude 45.4808205, longitude -122.9482947, datum WGS 84 (coordinates estimated from PLSS coordinates)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--11 to 13 degrees C
Moisture control section--dry 45 to 60 consecutive days following summer solstice
Depth to aquic conditions--20 to 50 cm
Depth to fragic soil properties (see Remarks)--50 to 100 cm

Particle-size control section
*Clay content--18 to 27 percent
*Total fragment content--0 to 5 percent

A horizon
Hue--10YR, 7.5YR
Value--3 moist, 5 or 6 dry
Chroma--2 or 3 moist or dry
Fine-earth texture--silt loam
Clay content--15 to 20 percent
Sand content--5 to 25 percent
Total fragment content--0 to 5 percent
Reaction--5.6 to 6.0
Thickness--15 to 23 cm

BAg horizon
Hue--10YR, 7.5YR
Value--3 or 4 moist, 5 or 6 dry
Chroma--3 or 4 moist or dry
Fine-earth texture--silt loam, loam
Clay content--15 to 25 percent
Sand content--15 to 30 percent
Total fragment content--0 to 5 percent
Reaction--5.6 to 6.5
Thickness--0 to 23 cm

Btg horizon
Hue--10YR, 7.5YR
Value--4 or 5 moist, 6 dry
Chroma--3 or 4 moist or dry
Fine-earth texture--silt loam, loam
Clay content--18 to 27 percent
Sand content--15 to 35 percent, less than 15 percent fine sand or coarser
Total fragment content--0 percent
Reaction--5.6 to 6.5
Thickness--13 to 23 cm

Bg horizon
Hue--10YR, 7.5YR
Value--4 or 5 moist, 6 dry
Chroma--3 or 4 moist or dry to a depth of 50 cm, 2 to 4 moist or dry below a depth of 50 cm
Fine-earth texture--silt loam, loam
Clay content--18 to 27 percent to a depth of 100 cm; 10 to 25 percent below a depth of 100 cm
Sand content--15 to 35 percent, less than 15 percent fine sand or coarser
Total fragment content--0 percent
Reaction--5.6 to 6.5
Thickness--65 to 115 cm

2C horizon
Hue--10YR, 7.5YR, 2.5Y
Value--3 to 5 moist, 4 to 6 dry
Chroma--2 to 4 moist or dry
Fine-earth texture--loam, silt loam, very fine sandy loam
Clay content--10 to 25 percent
Sand content--25 to 65 percent
Total fragment content--0 percent
Reaction--5.6 to 6.5

COMPETING SERIES: None

GEOGRAPHIC SETTING:
Elevation--30 to 110 m
Climate--warm, dry summers; cool, moist winters
Mean annual precipitation--1000 to 1500 mm
Mean annual air temperature--10 to 12 degrees C
Mean January air temperature--3 degrees C
Mean July air temperature--19 degrees C
Frost-free period--165 to 210 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Amity--mollic epipedon; argillic horizon; in similar positions of slightly higher terraces
Dayton--argillic horizon; fine texture; poorly drained; in concave positions of slightly higher terraces
Huberly--fragipan; poorly drained; in concave positions
Quatama--argillic horizon that is more than 27 percent clay; in similar positions
Willamette--mollic epipedon; argillic horizon; on slightly higher terraces
Woodburn--mollic epipedon; argillic horizon; on slightly higher terraces

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--somewhat poorly drained
Saturation in normal years--apparent perched water table at a depth of 30 to 60 cm below the surface
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--moderately low

USE AND VEGETATION:
Use--production of orchard crops, berries, grain, hay, and pasture
Potential natural vegetation--Douglas-fir, Oregon white oak, Oregon grape, California hazel, red alder

DISTRIBUTION AND EXTENT: Along the southern part of the Tualatin Valley and northern part of the Willamette Valley in northwestern Oregon; MLRA 2; moderate extent

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: Washington County, Oregon, 1974

REMARKS:
Diagnostic horizons and other features in this pedon
*Ochric epipedon
*Aquic conditions--zone from 20 to 152 cm
*Cambic horizon--zone from 38 to 152 cm
*Fragic soil properties--zone from 56 to 152 cm
*Lithologic discontinuity--152 cm

Fragic soil properties make up less than 60 percent of the horizons that have fragic properties.

The Aloha soils are on the Senecal surface, as recognized in the Willamette Valley.

8/2017--This official series description was updated according to SSR01 Technical Note 11--Content and Format of Official Series Descriptions (revised 11/2017). Most of the changes were in formatting. No major technical changes were made.

ADDITIONAL DATA:
Characterization data--user pedon ID numbers 91OR-067-005, 91OR-067-006, and 04OR-047-001

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National Cooperative Soil Survey
U.S.A.