LOCATION TIMBERLY OREstablished Series
TAXONOMIC CLASS: Coarse-loamy, isotic Typic Haplocryods
TYPICAL PEDON: Timberly very fine sandy loam, alpine meadow. (Colors are for moist soil unless otherwise noted.)
O1--1/2 inch to 0; loose litter of leaves, needles, etc.
A1--0 to 5 inches; very dark gray (10YR 3/1) very fine sandy loam, gray (10YR 5/1) dry and crushed; variegated with dark grayish brown (10YR 4/2) and dark gray (10YR 4/1); massive; soft, very friable, nonsticky and slightly plastic; many fine and very fine roots; many fine and very fine irregular pores; strongly acid (pH 5.1); clear wavy boundary. (5 to 8 inches thick)
A2--5 to 10 inches; very dark gray (10YR 4/1) very fine sandy loam, gray (10YR 5/1) and grayish brown (10YR 5/2) dry; variegated with dark grayish brown (10YR 4/2); massive; soft, very friable, nonsticky and slightly plastic; many roots; many very fine and fine irregular pores; strongly acid (pH 5.1); clear wavy boundary. (3 to 8 inches thick)
B2ir--10 to 18 inches; dark brown (7.5YR 3/3) very fine sandy loam, brown (10YR 4/3) dry and crushed; massive; soft, very friable, nonsticky and slightly plastic; many roots; many very fine and fine irregular pores; strongly acid (pH 5.2); clear wavy boundary. (6 to 12 inches thick)
B3--18 to 26 inches; dark brown (10YR 4/3) very fine sandy loam, brown (10YR 5/3) dry; massive; soft, very friable, nonsticky and slightly plastic; common roots; many fine and very fine irregular pores; strongly acid (pH 5.3); gradual wavy boundary. (6 to 18 inches thick)
C1--26 to 41 inches; dark grayish brown (10YR 4/2) very fine sandy loam, pale brown (10YR 6/3) dry and crushed; common fine distinct threadlike (stratified) reddish brown (5YR 4/4) mottles; variegations of grayish brown (10YR 5/2) and dark grayish brown (2.5Y 4/2); massive; slightly hard, friable, nonsticky and slightly plastic; few roots; many fine and very fine irregular pores; strongly acid (pH 5.2). (0 to 20 inches thick)
IIC2--41 to 60 inches; dark yellowish brown (10YR 4/4) very stony loamy sand; mottled as the above horizon; variegated with dark grayish brown (2.5Y 4/2) and olive brown (2.5Y 4/4); slightly hard, very friable, nonsticky and slightly plastic; 40 percent rounded stones, cobbles and pebbles; common roots; many fine and very fine irregular pores; medium acid (pH 5.6). (Many feet thick)
TYPE LOCATION: Clackamas County, Oregon; along tractor trail 200 feet above the Westleg Timberline road, below Phlox Point Campground; near center of section 7, T.3S., R.9E., W.M.
RANGE IN CHARACTERISTICS: The profiles are usually moist. The mean annual soil temperature ranges from 35 degrees to 40 degrees F. and the mean summer temperature is less than 47 degrees F. Thickness of solum ranges from 20 to 40 inches. Depth to bedrock commonly is greater than 60 inches.
d.pth to the IIC2 horizon ranges from 30 to 50 inches. The A and B horizons and the upper part of the C horizon range from fine sandy loam to very fine sandy loam and have 0 to 35 percent rock fragments.
The A1 horizon has value of 2 or 3 moist, 4 or 5 dry, and chroma of 1 or 2 moist and dry. The A2 horizon has value of 4 or 5 moist, 5 through 7 dry and chroma of 1 or 2 dry and moist.
The B horizon has hue of 7.5YR or 10YR, value of 3 or 4 moist, 4 or 5 dry, and chroma of 3 through 5 moist and dry.
The IIC2 horizon is loamy sand or sandy loam and has 35 to 70 percent rock fragments.
COMPETING SERIES: These are the Barlow, Blossom and Naptowne series. Barlow soils lack A1 horizons and have A2 horizons 3 inches or less thick and have soil temperature ranging from 40 degrees to 47 degrees F. Blossom soils are 20 to 40 inches deep to bedrock. Naptowne soils have sola less than 13 inches thick, have hue of 2.5Y or 5Y in the C horizon and are in an area that receives 18 to 25 inches of precipitation.
GEOGRAPHIC SETTING: The Timberly soils are on glaciated peaks in the Cascade Mountains between 5,500 and 6,500 feet elevation. Slopes range from 5 to 80 percent. The soils formed in moderately coarse or medium textured eolian deposits and moderately coarse textured glacial till of andesitic and basaltic origin. The glacial till is less than 2,000 years old and the overlying eolian deposits are younger. Minor amounts of volcanic ash and pumice are incorporated. The climate is humid. Mean annual precipitation ranges from 100 to 120 inches, falling as rain in the early autumn and late spring and snow in the late autumn, winter and early spring. Average annual maximum snow pack ranges from 10 to more than 15 feet. Rainfall amounts are relatively low in the summer. The average January temperature is 26 degrees F. The average July temperature is 56 degrees F. The average annual temperature is 33 degrees to 38 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Mt. Hood soils and the competing Barlow soils. Mt. Hood soils are loamy-skeletal.
DRAINAGE AND PERMEABILITY: Well drained; slow to rapid runoff; moderately rapid permeability.
USE AND VEGETATION: Timberly soils are used for recreation and wildlife. The vegetation is park-like with clumps of mountain hemlock, a;pine fir, and whitebark pine. Ground vegetation consists of a wide variety of herbaceous plants including rushes and sedges, grasses, lupine, phlox, many composites and other herbs.
DISTRIBUTION AND EXTENT: Cascade Mountains of northwest Oregon. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Clackamas County, Oregon (Bull Run, Sandy Area), 1976.
ADDITIONAL DATA: Characterization data on 2 pedons (FS64-Ore-46 and FS64-Ore-44) by Oregon State University. (Unpublished)
NSTH 17, RECLASSIFICATION ONLY, 3/95