LOCATION MOAG OREstablished Series
TAXONOMIC CLASS: Fine, mixed, superactive, nonacid, mesic Vertic Endoaquepts
TYPICAL PEDON: Moag silty clay loam, noncultivated. (Colors are for moist soil unless otherwise noted.)
Ap1--0 to 4 inches; dark grayish brown (10YR 4/2) silty clay loam, light brownish gray (10YR 6/2) dry; few fine prominent yellowish red redox concentrations; moderate fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine roots; many very fine and fine irregular pores; moderately acid (pH 6.0); clear smooth boundary. (4 to 8 inches thick)
Ap2--4 to 10 inches; dark grayish brown (10YR 4/2) silty clay loam, light gray (10YR 7/2) dry; few fine prominent yellowish red redox concentrations; moderate medium subangular blocky structure; hard, firm, very sticky and plastic; few very fine roots; common very fine tubular pores; moderately acid (pH 5.8); abrupt smooth boundary. (2 to 4 inches thick)
Bw1--10 to 28 inches; dark grayish brown (2.5Y 4/2) silty clay, light brownish gray (2.5Y 6/2) dry; common fine brown (7.5YR 5/3) dry redox concentrations; weak medium prismatic structure parting to moderate medium subangular blocky; hard, firm, very sticky and moderately plastic; few very fine roots; many very fine and fine tubular pores, mostly vertical; moderately acid (pH 5.8); gradual wavy boundary. (15 to 20 inches thick)
Bw2--28 to 37 inches; dark gray (10YR 4/1) silty clay, light gray (2.5Y 7/2) dry; many fine distinct, dark gray, yellowish brown and yellowish red redox concentrations; strong moderate and coarse prismatic structure; very hard, very firm, very sticky and very plastic; few very fine roots; common very fine tubular pores; moderately acid (pH 5.8); abrupt smooth boundary. (8 to 10 inches thick)
C--37 to 60 inches; dark grayish brown (2.5Y 4/2) silty clay, light gray (10YR 7/1) dry; common dark gray (10YR 4/1) coatings in pores; many thick yellowish red (5YR 5/8) clay coatings in pores; massive; hard, firm, very sticky and very plastic; moderately acid (pH 5.8).
TYPE LOCATION: Multnomah County, Oregon; 1,000 feet east of Oak Island Road; NW1/4 SE1/4 SE1/4 section 5, T.2N., R.1W.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 53 to 55 degrees F. The soils are saturated with water throughout the year and subject to freshwater overflow during high tides and spring floods unless diked and artificially drained. The soils are assumed to have an irregular decrease in organic matter.
The A horizon has value of 3 or 4 moist, 6 or 7 dry and chroma of 1 or 2 moist and dry. It is silt loam or silty clay loam. This horizon has moderate or strong granular or subangular blocky structure.
The B horizon has hue of 10YR or 2.5Y, value of 3 or 4 moist, 6 or 7 dry, and chroma of 1 or 2 moist and dry. It has distinct or prominent redox concentrations. This horizon is silty clay or clay and has 40 to 50 percent clay. Thin lenses of peaty or loamy material with value of 2 or 3 and chroma of 1 are common in some pedons.
The C horizon has hue of 10YR, 2.5Y or neutral, value of 4 or 5 moist and chroma of 0 through 2 moist and dry. It is stratified material ranging from silty clay, silt loam or sandy loam. Redox concentrations are distinct with some areas having dark brown (7.5YR 3/2) "pipestems" up to 1/4 inch in diameter formed in tubular pores and channels. Thin layers of gray (10YR 6/1) ash-like material are common in some pedons.
COMPETING SERIES: These are the Bellingham and Rennie series. The Bellingham, Rennie and Moag series need further review for adequate series separation.
GEOGRAPHIC SETTING: The Moag soils are on broad nearly level undulating flood plains of the Columbia River at elevations of 10 to 20 feet. They formed in fine textured recent alluvium of mixed origin. The winters are cool and moist and summers are warm and dry. The mean January temperature is about 40 degrees F.; mean July temperature is about 68 degrees F.; and the mean annual temperature is about 53 degrees F. The frost-free season is about 165 to 210 days. The mean annual precipitation ranges from 40 to 60 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Rafton and Sauvie soils. Rafton and Sauvie soils have fine-silty profiles. Sauvie soils lack prominent redox concentrations above depth of 20 inches.
DRAINAGE AND PERMEABILITY: Very poorly drained; ponded; slow permeability.
USE AND VEGETATION: These soils are used for hay, pasture, and truck crops. Other used include recreation and wildlife habitat. Where this soil is not cultivated, the vegetation is black cottonwood, willow, rose, common snowberry, with sedges, cattails, and grasses.
DISTRIBUTION AND EXTENT: Flood plains of the lower Columbia River in Oregon. The soil is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Multnomah County, Oregon, 1977.
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