LOCATION DODD WAEstablished Series
TAXONOMIC CLASS: Sandy-skeletal, isotic Lithic Cryorthents
TYPICAL PEDON: Dodd very gravelly ashy sandy loam, on a southwest facing 28 percent slope at an elevation of 5,750 feet in a Engelmann spruce, subalpine fir and lodgepole pine forest. (Colors are for dry soil unless otherwise stated. All textures are apparent field textures.)
Oe--0 to 1 inch; moderately decomposed needles, leaves and twigs; clear smooth boundary. (1 to 2 inches thick)
A--1 to 5 inches; pale brown (10YR 6/3) very ashy gravelly sandy loam, brown (10YR 4/3) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and fine roots and few medium and coarse roots; common fine tubular pores; 35 percent gravel; slightly acid (pH 6.1); clear smooth boundary. (2 to 5 inches thick)
Bw--5 to 9 inches; light yellowish brown (10YR 6/4) very gravelly ashy coarse sandy loam, brown (10YR 4/3) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine and fine roots and few medium and coarse roots; few fine irregular pores; 45 percent gravel; slightly acid (pH 6.2); clear wavy boundary. (3 to 6 inches thick)
2C--9 to 17 inches; light yellowish brown (10YR 6/4) extremely gravelly loamy coarse sand, yellowish brown (10YR 5/6) moist; single grain; loose, nonsticky and nonplastic; few very fine roots; 65 percent gravel; moderately acid (pH 6.0); gradual wavy boundary. (7 to 12 inches thick)
2R--17 inches; granite.
TYPE LOCATION: Okanogan County, Washington; about 14 miles west from the town of Loomis, Washington; 500 feet east and 800 feet north of the southwest corner of section 27, T. 39 N., R. 23 E. (Latitude 48 degrees, 50 minutes, 41 seconds N., Longitude 119 degrees, 56 minutes, 47 seconds W.)
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 37 to 41 degrees F. The mean summer soil temperature ranges from 42 to 46 degrees F. These soils are usually moist but are dry in all parts of the moisture control section for 45 to 60 consecutive days following the summer solstice. The solum has an estimated bulk density of 1.10 to 1.30 g/cc, volcanic glass content of 5 to 20 percent, acid-oxalate extractable aluminum plus one-half of the acid-oxalate extractable iron of 0.4 to 1.0 percent, and 15-bar water retention of 5 to 10 percent for air dried samples. Depth to the lithic contact is 10 to 20 inches. The particle-size control section averages 50 to 70 percent rock fragments and 2 to 6 percent clay. Reaction is moderately acid to slightly acid throughout.
The A horizon has value of 5 or 6 dry, 3 or 4 moist, and chroma of 3 or 4 dry or moist.
The Bw horizon has value of 5 or 6 dry, 3 or 4 moist, and chroma of 3 or 4 dry or moist. It is very gravelly ashy sandy loam or very gravelly ashy coarse sandy loam. It has 35 to 50 percent pebbles and 0 to 5 percent cobbles.
The 2C horizon has value of 6 or 7 dry, 4 or 5 moist, and chroma of 3 or 4 dry and 4 to 6 moist. It has 55 to 70 percent pebbles and 5 to 10 percent cobbles.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Dodd soils are on shoulders and ridges of mountains. These soils formed in residuum and colluvium from granite with a component of volcanic ash in the upper part. Slopes are 15 to 40 percent. Elevations range from 4,900 to 6,200 feet. The climate is characterized by cold, wet winters and cool, dry summers. Average annual precipitation ranges from 25 to 35 inches. The average January temperature ranges from 18 to 22 degrees F., the average July temperature ranges from 52 to 58 degrees F., and the average annual air temperature ranges from 35 to 40 degrees F. The frost-free season is 60 to 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Wellsfar, Myerscreek and Sitdown soils. The Wellsfar soils are 20 to 40 inches to a paralithic contact. Myerscreek soils are very deep and form in compact glacial till with a mantle of volcanic ash. Sitdown soils are very deep and form in ablation till or outwash with a mantle of volcanic ash.
DRAINAGE AND PERMEABILITY: Well drained, rapid to very rapid runoff; rapid permeability.
USE AND VEGETATION: Used mostly for wildlife habitat, recreation, watershed, and livestock grazing. Native vegetation is subalpine fir, Engelmann spruce, lodgepole pine, Douglas-fir, grouse blueberry, silky lupine, heartleaf arnica, Utah honeysuckle and northwest sedge.
DISTRIBUTION AND EXTENT: Northcentral Washington. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Okanogan National Forest, Okanogan County, Washington, 2005.
REMARKS: Diagnostic horizons and features recognized in this soil are an ochric epipedon with a component of volcanic ash from the surface to 5 inches, a Bw from 5 to 9 inches that has less ash than the A horizon but sufficient to quality for Vitrandic and is too thin for a cambic horizon. A lithic contact at 17 inches and a sandy-skeletal particle-size control section. Vitrandic properties from 1 to 9 inches.
All depths to diagnostic horizons and other features are measured from the top of the first mineral horizon.