LOCATION NETRAC WAEstablished Series
TAXONOMIC CLASS: Sandy-skeletal, mixed, mesic Vitrandic
Xerorthents
TYPICAL PEDON: Netrac sand - forested. (Colors are for moist soil unless otherwise noted.)
0l--l inch to l; undecomposed needles and twigs; abrupt smooth boundary. (.5 to 2 inches thick)
Al--0 to 2 inches; very dark gray (l0YR 3/l) sand (volcanic ash), gray (l0YR 5/l) dry; single grained; loose; many roots; many very fine interstitial pores; neutral (pH 6.6); clear wavy boundary. (l to 8 inches thick)
Cl--2 to 7 inches; gray (l0YR 5/l) sand (volcanic ash), very pale brown (l0YR 8/3) dry; single grained; loose; many roots; many very fine interstitial pores; neutral (pH 6.6); abrupt smooth boundary. ( 3 to 7 inches thick)
2Alb--7 to l0 inches; very dark grayish brown (l0YR 3/2) loamy fine sand, dark brown (l0YR 4/3) dry; massive; soft, very friable; many roots; many very fine interstitial pores; slightly acid (pH 6.4); clear smooth boundary. (2 to 6 inches thick)
2B2b--l0 to 2l inches; dark yellowish brown (l0YR 3/4) loamy fine sand, brown (l0YR 5/3) dry; weak very coarse and coarse subangular blocky structure; soft, very friable; many roots; many very fine interstitial pores; 5 percent pebbles; slightly acid (pH 6.4); abrupt wavy boundary. (5 to 20 inches thick)
2C2--2l to 60 inches; dark yellowish brown (l0YR 3/4) extremely gravelly sand, brown (l0YR 4/3) dry; single grained; loose; few roots; many fine and very fine interstitial pores; 70 percent pebbles, l0 percent cobbles; slightly acid (pH 6.4).
TYPE LOCATION: Lewis County, Washington; one mile north of Packwood; 700 feet west and 200 feet south of northeast corner of sec. l6, T. l3 N., R. 9 E.
RANGE IN CHARACTERISTICS: The volcanic ash mantle is 7 to l4 inches thick. The mean annual soil temperature is about 47 to 5l F. Netrac soils are usually moist but are dry in all parts for 60 to 75 consecutive days between depths of 8 to 24 inches following summer solstice. They are slightly acid or neutral throughout. The particle- size control section averages 35 to 70 percent rock fragments.
The Al horizon have value of 2 or 3 moist, 4 or 5 dry, and chroma of l or 2 moist and dry.
The 2Alb and the 2B2b horizons have value of 3 or 4 moist, 4 or 5 dry, and chroma of 2 through 4. They are sand, loamy fine sand or gravelly fine sand.
The 2C horizon is extremely gravelly sand, extremely gravelly loamy sand or extremely gravelly fine sand. It has 60 to 90 percent coarse fragments.
COMPETING SERIES: These are the Grove and Neilton series. These soils lack the surface mantle of volcanic ash.
GEOGRAPHIC SETTING: Netrac soils are on glacial outwash terraces and have slopes of 0 to l5 percent. They formed in glacial outwash with a mantle of volcanic ash. Elevations are 800 to l,500 feet. The soils are in a marine type climate with average annual precipitation of 50 to 70 inches occurring mostly as rain during the winter; mean January temperature is about 36 degrees F., mean July temperature is about 63 degrees F.; and the mean annual temperature is about 48 degrees F. The frost-free season is l25 to l75 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Cispus, Cotteral, Nevat, Ledow, Schooley, and Semiahmoo soils. Cispus and Cotteral soils have more than 60 percent vitric volcanic ash, cinders or other pyroclastic materials to a depth of more than 35 cm. Nevat soils have less than 35 percent rock fragments in the particle-size control section. Ledow soils lack the surface layer of ash and have less than 35 percent rock fragments in the particle-size control section. Schooley soils are coarse-loamy and have an aquic moisture regime.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained; slow runoff; permeability of the upper two feet is rapid and is very rapid in the underlying extremely gravelly substratum.
USE AND VEGETATION: Used for woodland and homesites. Native vegetation is mainly Douglas-fir and western redcedar with an understory of salal, Oregongrape, western brackenfern, and trailing blackberry.
DISTRIBUTION AND EXTENT: Eastern Lewis County, Washington. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Lewis County, Washington, l976.
REMARKS: Classification only changed 4/94 because of recent amendments to Soil Taxonomy.