LOCATION STABBART WA
Established Series
MEH/RJE
06/2011
STABBART SERIES
The Stabbart series consists of deep, somewhat poorly drained soils formed in alluvium. These soils are on toe slopes and alluvial fans at elevations of 800 to 1,200 feet. Slopes are 0 to 3 percent. The mean annual precipitation is about 95 inches and the mean annual temperature is about 46 degrees F.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Aquic Humudepts
TYPICAL PEDON: Stabbart - forested on a 1 percent east facing slope at 1,090 feet elevation. (Colors are for moist soil unless otherwise noted. All textures are apparent field textures.)
A--0 to 13 inches; very dark grayish brown (10YR 3/2) clay loam, brown (10YR 5/3) dry; moderate fine granular structure and weak very fine subangular blocky structure; soft, very friable, slightly sticky and nonplastic; many very fine and fine roots; many very fine irregular pores; 5 percent gravel and 10 percent concretions; moderately acid (pH 5.6); clear smooth boundary. (10 to l5 inches thick)
BA--13 to 18 inches; dark brown (10YR 3/3) clay loam, pale brown (10YR 6/3) dry; few fine faint dark grayish brown (10YR 4/2) redox depletions; moderate very fine and fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine, common fine, and few coarse roots; common very fine irregular and few fine tubular pores; 5 percent concretions; strongly acid (pH 5.4); clear wavy boundary. (0 to 8 inches thick)
Bt1--18 to 29 inches; brown (10YR 4/3) clay loam, pale brown (10YR 6/3) dry; few fine faint dark grayish brown (10YR 4/2) redox depletions and few fine distinct strong brown (7.5YR 5/8) redox concentrations; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine and few coarse roots; few very fine and fine irregular pores; very few thin clay films on faces of peds; strongly acid (pH 5.4); clear irregular boundary. (8 to 20 inches thick)
Bt2--29 to 37 inches; light yellowish brown (10YR 6/4) silty clay loam, very pale brown (10YR 8/2) dry; common fine distinct gray (10YR 6/1) redox depletions and strong brown (7.5YR 5/6) redox concentrations; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; few very fine tubular pores; few moderately thick clay films on faces of peds; moderately acid (pH 5.9); clear wavy boundary. (0 to 10 inches thick)
C--37 to 60 inches; light yellowish brown (10YR 6/4) clay loam, very pale brown (10YR 7/3) dry; common fine distinct gray (10YR 6/1) redox depletions and strong brown (7.5YR 5/6) redox concentrations; massive; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots; common very fine and fine irregular pores; strongly acid (pH 5.4).
TYPE LOCATION: Skamania County, Washington; about 2 miles south of Stabler, 1,100 feet south and 2,000 feet east of the northwest corner of sec. 35, T. 4 N., R. 7 E.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 47 to 49 degrees F. The solum is 30 to 40 inches thick. The umbric epipedon is 10 to 15 inches thick. The control section is 27 to 35 percent clay. Low chroma redox depletions are at a depth of 10 to 15 inches.
The A horizon has chroma of 2 or 3 moist or dry. Content of concretions range from 5 to 10 percent.
The Bt horizon has value of 3 to 6 moist, 5 to 8 dry, and chroma of 2 to 4 moist and dry. It is clay loam or silty clay loam.
The C horizon has value of 4 to 6 moist, 5 to 7 dry, and chroma of 3 or 4 moist or dry.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Stabbart soils are on toe slopes and alluvial fans at elevations of 800 to 1,200 feet. These soils formed in alluvium derived dominantly from fine textured igneous rock. Slopes are 0 to 3 percent. The climate is characterized by warm, dry summers and cool, wet winters The mean annual precipitation is 90 to 100 inches. The mean January temperature is about 30 degrees F, mean July temperature is about 62 degrees F, and the mean annual temperature is 45 to 48 degrees F. The frost-free season is 115 to 135 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the McElroy, St.
Martin, and
Stabler soils. McElroy soils are loamy-skeletal. St. Martin soils are in the fine family. Stabler soils are medial.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; slow runoff; moderately slow permeability. An apparent water table is as high as 0.5 to 1.0 at times from January to May.
USE AND VEGETATION: Used for timber production, homesites, and wildlife habitat. The native vegetation is Douglas-fir, grand fir, western redcedar, red alder, and bigleaf maple. Understory species include vine maple, western hazel, Pacific dogwood, thimbleberry, Oregon-grape, and trailing blackberry.
DISTRIBUTION AND EXTENT: Southern Skamania County, Washington. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Skamania County, Washington, 1987.
REMARKS: Diagnostic horizons and features recognized in this soil are;
umbric epipedon from 0 to 18 inches
cambic horizon from 18 to 37 inches.
The Bt horizon lacks enough clay increase over the horizon above to qualify as argillic.
Series needs review for aquept suborder placement. Dominant chroma is 3 at 13 inches below the surface with few faint low chroma depletions and at 18 inches dominant chroma of 3 with few faint depletions and few distinct concentrations.
National Cooperative Soil Survey
U.S.A.