LOCATION WYETH OR

Established Series
Rev. DFA/AON
06/2011

WYETH SERIES

The Wyeth series consists of deep and very deep, well drained soils that formed in mixed loess, volcanic ash and basalt colluvium. These soils are on north-facing slopes and have slope of 5 to 75 percent. The mean annual precipitation is about 47 inches and the mean annual air temperature is about 49 degrees F.

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic Pachic Humixerepts

TYPICAL PEDON: Wyeth very cobbly loam, woodland. (Colors are for moist soil unless otherwise noted.)

Oi--0 to 1 inch; slightly decomposed pine needles, twigs and leaves.

A1--1 to 6 inches; dark brown (10YR 3/3) very cobbly loam, brown (10YR 5/3) dry; weak fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine roots; many very fine irregular pores; 15 percent gravel and 20 percent cobbles; neutral (pH 6.6); clear smooth boundary. (4 to 8 inches thick)

A2--6 to 18 inches; dark brown (10YR 3/3) very cobbly loam, brown (10YR 5/3) dry; weak fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many fine and very fine roots; many very fine tubular pores; 15 percent gravel and 30 percent cobbles; neutral (pH 6.6); clear wavy boundary. (0 to 16 inches thick)

AC--18 to 30 inches; dark brown (10YR 3/3) extremely cobbly loam, brown (10YR 5/3) dry; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many medium, fine and very fine roots; many very fine tubular pores; 20 percent gravel and 45 percent cobbles; slightly acid (pH 6.4); abrupt wavy boundary. (10 to 16 inches thick)

C1--30 to 42 inches; dark brown (10YR 3/3) extremely cobbly loam, brown (10YR 5/3) dry; massive; slightly hard, friable, slightly sticky and slightly plastic; many medium, fine and very fine roots; common very fine tubular pores; 15 percent gravel, 50 percent cobbles and 10 percent stones; slightly acid (pH 6.4); clear wavy boundary. (8 to 15 inches thick)

C2--42 to 63 inches; dark grayish brown (10YR 4/2) extremely cobbly loam, light brown (7.5YR 6/3) dry; massive; slightly hard, friable, slightly sticky and slightly plastic; many fine and very fine roots; common very fine tubular pores; 25 percent gravel, 35 percent cobbles and 5 percent stones; slightly acid (pH 6.2); clear smooth boundary.

TYPE LOCATION: Hood River County, Oregon; in the NE1/4 SE1/4 SE1/4 section 34, T. 3 N., R. 8 E.

RANGE IN CHARACTERISTICS: The soils are usually moist but are dry throughout the control section for 45 to 70 consecutive days during the 4-month period following the summer solstice. The mean annual soil temperature ranges from 50 to 53 degrees F. Depth to bedrock ranges from 40 to more than 60 inches. The umbric epipedon is 20 to 36 inches thick. The control section averages 35 to 75 percent rock fragments and 18 to 27 percent clay. The sola range from moderately acid to neutral.

The A horizon has hue of 10YR or 7.5YR, value of 2 or 3 moist, 4 or 5 dry, and chroma of 2 or 3 moist and dry. It has 10 to 50 percent gravel, 5 to 30 percent cobbles and 0 to 5 percent stones.

The AC horizon has hue of 10YR or 7.5YR, value of 2 or 3 moist, 4 or 5 dry, and chroma of 2 or 3 moist and 3 or 4 dry. It is loam and has 15 to 60 percent gravel, 15 to 50 percent cobbles and 0 to 5 percent stones. This horizon has weak to moderate fine or medium subangular blocky structure.

The C horizon has hue of 10YR or 7.5YR, value of 3 or 4 moist, 5 or 6 dry, and chroma of 2 through 4 moist and dry.

COMPETING SERIES: These are the Coyata, Fiddletown and Washougal series. Coyata soils are 20 to 40 inches deep to bedrock, have 5YR hue, are moderately fine textured and have epipedons less than 20 inches thick. Fiddletown soils are less than 40 inches deep to weathered bedrock. Washougal soils have very gravelly sand C horizons at depths of 26 to 40 inches.

GEOGRAPHIC SETTING: The Wyeth soils are on north-facing slopes at elevations of 200 to 2,500 feet. Slopes are 5 to 75 percent. The soils formed in mixed loess, volcanic ash and basalt colluvium. Mean annual precipitation is 35 to 60 inches. The mean annual temperature ranges from 48 to 51 degrees F. The frost-free period is 100 to 180 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Culbertson and Oak Grove soils. Culbertson soils are fine-loamy. Oak Grove soils have fine-textured argillic horizons.

DRAINAGE AND PERMEABILITY: Well-drained; medium to rapid runoff; moderate permeability.

USE AND VEGETATION: Principal use is timber production. Other uses are grazing and wildlife. Vegetation is mainly Douglas-fir, western redcedar, bigleaf maple and red alder.

DISTRIBUTION AND EXTENT: Uplands of north-central Oregon; MLRA 6. The series is inextensive.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: Hood River County, Oregon, 1975.

REMARKS:

National Cooperative Soil Survey
U.S.A.