LOCATION DEPOE OR
Established Series
Rev. WRP/CDJ/RWL
01/2011
DEPOE SERIES
The Depoe series consists of poorly drained soils, shallow to an ortstein pan that formed in stratified marine sediments. Depoe soils are on marine terraces and have slopes of 0 to 8 percent. The mean annual temperature is about 52 degrees F., and the mean annual precipitation is about 75 inches.
TAXONOMIC CLASS: Loamy, isotic, isomesic, ortstein, shallow Typic Duraquods
TYPICAL PEDON: Depoe loam, forested. (Colors are for moist soil unless otherwise noted.)
Oi--0 to 3 inches; layer of slightly decomposed leaves, needles, twigs, cones and moss, with many fine and very fine roots.
A--3 to 7 inches; very dark grayish brown (10YR 3/2) and dark grayish brown (10YR 4/2) loam, grayish brown (10YR 5/2) and light brownish gray (10YR 6/2) dry; weak medium subangular blocky structure to massive; slightly hard, friable, slightly sticky and slightly plastic; many fine and very fine roots; many very fine tubular pores; very strongly acid (pH 4.6); clear wavy boundary. (3 to 9 inches thick)
E1--7 to 12 inches; dark gray (10YR 4/1) sandy loam, light gray (10YR 7/1) dry; massive; slightly hard, friable, nonsticky and nonplastic; few very fine roots; common very fine tubular pores; few weakly cemented nodules; very strongly acid (pH 4.6); clear wavy boundary. (3 to 6 inches thick)
E2--12 to 19 inches; grayish brown (2.5Y 5/2) loam, light gray (2.5Y 7/2) dry; massive; hard, friable, slightly sticky and slightly plastic; common very fine tubular pores; common medium prominent light olive brown (2.5Y 5/6) masses or iron accumulation; common firm nodules; very strongly acid (pH 4.8); abrupt wavy boundary. (4 to 8 inches thick)
2Bsm--19 to 24 inches; brownish yellow (10YR 6/6) and brownish yellow (10YR 6/8) strongly cemented fine sand with thin dark red (2.5YR 3/6) and red (2.5YR 4/6) bands or seams, light gray (10YR 7/2) and yellowish red (5YR 5/6) and yellowish red (5YR 5/8) dry; massive; extremely hard, extremely firm, nonsticky and nonplastic; few very fine tubular pores; strongly acid (pH 5.2); abrupt wavy boundary. (3 to 8 inches thick)
2BCsm--24 to 51 inches; brownish yellow (10YR 6/6) moderately cemented fine sand with strongly cemented yellowish red (5YR 4/6) irregular bands, very pale brown (10YR 7/3) and very pale brown (10YR 7/4) and strong brown (7.5YR 5/8) dry; massive, hard and extremely hard, extremely firm, nonsticky and nonplastic; few very fine tubular pores; moderately acid (pH 5.6); abrupt wavy boundary. (20 to 30 inches thick)
2C--51 to 63 inches; light gray (10YR 7/1) fine sand with thin strong brown (7.5YR 5/8) layers or bands, white (10YR 8/1) dry; massive; slightly hard, friable, nonsticky and nonplastic with thin weakly cemented intermittent bands or nodules; common very fine irregular and tubular pores; moderately acid (pH 5.6).
TYPE LOCATION: Lincoln County, Oregon; about 25 feet north of gravel road in the NW SW SW section 5, T. 13 S., R. 11 W. about 21/4 miles due north of Walport, Oregon.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 50 to 55 degrees F. The difference between mean summer and mean winter soil temperature varies from 5 to 9 degrees F. The soil has a udic moisture regime; but has a short dry period of less than 45 days during the four-month period following the summer solstice. Depth to the ortstein layer is 12 to 20 inches. Depth to bedrock is greater than 60 inches. The particle-size control section averages 15 to 27 percent clay. The mineral surface when mixed to a depth of 10 inches has moist value of 2 or 3, 5 dry and chroma of 1 or 2 moist and dry.
The A horizon has hue of 10YR with value of 2 to 4 moist, 5 or 6 dry and chroma of 1 to 3 moist and dry. It is very strongly acid or strongly acid.
The E horizon has hue of 10YR with value of 3 through 5 moist, 6 through 8 dry and chroma of 1 or 2 moist and dry. It is loam, sandy loam or silt loam. It is very strongly acid or strongly acid.
The 2Bsm and 2BCsm horizon is variegated, with hues of 10YR through 2.5YR, value of 3 through 7 and chroma of 3 through 8. It is loamy sand, fine sand, sand with moderate to strong cementation. The stronger cementation is in the redder bands indicating iron and/or aluminum cementation. The free iron to carbon ratio ranges from 0.2 to 2.
The 2C horizon is variegated loamy fine sand, fine sand or sand that is weakly stratified in some areas and has intermittent lenses cemented by iron and/or aluminum. It is strongly acid or moderately acid.
COMPETING SERIES: This is the
Joeney series. The Joeney soils have an ochric epipedon.
GEOGRAPHIC SETTING: Depoe soils are in depressional to gently sloping areas on marine terraces at elevations of 50 to 400 feet. Slopes range from 0 to 8 percent. They formed in weakly stratified marine sediments and eolian deposits. The climate is characterized by cool wet winters and cool moist summers. The mean annual precipitation is 60 to 90 inches. The mean annual temperature is 49 to 53 degrees F., mean July temperature is about 53 degrees F., and the mean January temperature is about 49 degrees F. The frost-free period is 180 to 300 days. Depoe soils occur on the Pioneer Geomorphic surface.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Bandon,
Blacklock,
Bullards,
Ferrelo,
Fendall,
Lint,
Nelscott,
Netarts and
Yaquina soils. Bandon soils are well drained and have an ortstein layer at 20 to 36 inches. Bullards, Netarts, and Yaquina soils lack an ortstein layer and are very deep. In addition, Bullards soils are coarse-loamy and Blacklock, Netarts and Yaquina soils are sandy. Ferrelo, Fendall, and Lint soils lack a spodic horizon. Nelscott soils are moderately well drained and are 24 to 40 inches deep to the cemented Bsm horizon.
DRAINAGE AND PERMEABILITY: Poorly drained; moderate permeability in the upper part of the solum; very slow in the cemented pan and moderately rapid in the substratum. A perched water table fluctuates between depths of 1 and 2 feet below the surface during the summer months and to 0.5 feet above the surface from October to May.
USE AND VEGETATION: Watershed, wildlife habitat and limited timber production. Natural vegetation is shore pine, Sitka spruce, western hemlock, western redcedar, Port-Orford cedar, Pacific rhododendron, salal, evergreen huckleberry, cascara, deer fern, false azalea, moss, and limited herbaceous species.
DISTRIBUTION AND EXTENT: Marine terraces along the Oregon coast; MLRA 1. The series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Alsea Area, Oregon, 1973.
REMARKS: This draft (3/98) reflects a change in classification from mixed to isotic minerology based on seventh edition of Soil Taxonomy.
Diagnostic horizons and features of this pedon include:
Albic horizon - from 7 to 19 inches (E1 and E2 horizons).
Spodic horizon - from 19 to 51 inches (2Bsm and 2BCsm horizons).
Aquic conditions - the zone from 7 to 19 inches having redoximorphic depletions with chroma of 2 or less and redoximorphic concentrations (E1 and E2 horizons).
Duric feature - the zone from 19 to 51 inches having a cemented ortstein layer (2Bsm and 2BCsm horizons).
Episaturation
All depths to diagnostic features are measured from the top of the mineral soil.
National Cooperative Soil Survey
U.S.A.