LOCATION LEMOLO WAEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, nonacid, mesic Typic Humaquepts
TYPICAL PEDON: Lemolo silt loam - on a nearly level terrace under coniferous forest at 1,380 feet elevation. (Colors are for moist soil unless otherwise noted.)
Oi--6 to 5 inches; moss, undecomposed needles and twigs; abrupt smooth boundary. (1 to 3 inches thick)
Oa--5 inches to 0; well decomposed organic matter, black (10YR 2/1) unrubbed; very dark brown (10YR 2/2) rubbed; many very fine, fine, medium, and coarse roots; extremely acid (pH 4.2); clear smooth boundary. (5 to 10 inches thick)7
A1--0 to 5 inches; black (10YR 2/1) silt loam, dark grayish brown (10YR 4/2) dry; weak medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine, fine, and medium roots; very strongly acid (pH 4.6); clear smooth boundary. (5 to 12 inches thick)
A2--5 to 17 inches; very dark gray (10YR 3/1) loam, grayish brown (10YR 5/2) dry; weak medium subangular blocky structure; soft, friable, slightly sticky and plastic; few fine and medium roots; 15 percent pebbles; very strongly acid (pH 5.0); abrupt irregular boundary. (10 to 18 inches thick)
2Cg1--17 to 34 inches; grayish brown (10YR 5/2) very gravelly sandy clay loam, light gray (10YR 7/2) dry; many large prominent dark brown (7.5YR 3/4) strong brown (7.5YR 4/6), and dark reddish brown (5YR 3/4) mottles; massive; slightly hard, firm, slightly sticky and slightly plastic; 50 percent pebbles, 10 percent cobbles; medium acid (pH 5.8); clear smooth boundary. (15 to 20 inches thick)
2Cg2--34 to 60 inches; gray (10YR 5/1) very gravelly sandy clay loam, light gray (2.5YR 7/2) dry; common medium prominent dark brown (7.5YR 4/4) and strong brown (7.5YR 5/8) mottles; massive; slightly hard, friable, slightly sticky and slightly plastic; 50 percent pebbles, 10 percent cobbles; medium acid (pH 6.0).
TYPE LOCATION: Snoqualmie Pass Area, King County, Washington; about 5 miles east and 4 miles south of Enumclaw off U.S. Highway 410; 2,400 feet north and 1,050 feet west of the SE corner of sec. 3, T. 19 N., R 7 E.
RANGE IN CHARACTERISTICS: Mean annual soil temperature ranges from 47 to 51 degrees F. Depth of the 2Cg horizon ranges from 16 to 25 inches.
Coarse fragments in the particle-size control section average from 50 to 70 percent by volume.
The A horizon has value of 2 or 3 moist, 4 or 5 dry, and chroma of 1 or 2 moist or dry. Some pedons have a Bg horizon. Texture of the lower part is loam or silt loam.
The 2Cg horizon has hue of 10YR or 2.5YR, value of 5 or 6 moist, and chroma of 1 or 2 moist or dry. Texture is very gravelly sandy loam or extremely gravelly sandy loam, very gravelly sandy clay loam or extremely gravelly sandy clay
loam.
COMPETING SERIES: This is the McKenna series in another family. McKenna soils lack an umbric epipedon and have a paralithic contact at 20 to 40 inches.
GEOGRAPHIC SETTING: Lemolo soils are terraces in the White River valley, within the Cascade Mountain front and have slopes of 0 to 8 percent. The soils formed in the Osceola mudflow. Lemolo soils are at elevations from 750 to 1,600 feet. Average annual precipitation ranges from 50 to 60 inches. The mean January temperature is about 36oF; the mean July temperature is about 62 degrees F; the mean annual temperature is about 48 degrees F. The frost-free season is 160 to 200 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Alderwood, Barneston, Buckley, Greenwater, Minnehaha, and Winston soils. All of these soils except Buckley soils lack an aquic moisture regime, In addition, Alderwood soils have an ortstein layer. Barneston soils are sandy- skeletal. Buckley soils have 15 to 35 percent coarse fragments in the particle-size control section. Greenwater soils are sandy. Minnehaha soils are sandy-skeletal. Winston soils are medial over sandy or sandy- skeletal.
DRAINAGE AND PERMEABILITY: Poorly drained; slow runoff; slow permeability. A perched water table occurs as high as 0 to 1 foot at times from November through May. This soil is subject to rare periods of flooding.
USE AND VEGETATION: Timber production is the principal use. Native vegetation is western hemlock, Sitka spruce, western redcedar, red alder, and Douglas-fir. Understory species include western swordfern, vine maple, Trillium, devilsclub,
and red huckleberry
DISTRIBUTION AND EXTENT: The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Snoqualmie Pass Area, King County, Washington, 1986. Source of name is a cablecar crossing on Green River in eastern King County.