LOCATION HOOGDAL WAEstablished Series
TAXONOMIC CLASS: Fine, mixed, superactive, mesic Aquic Dystroxerepts
TYPICAL PEDON: Hoogdal silt loam - on a 28 percent northwest facing slope under a forest canopy. (Colors are for moist soil unless otherwise stated.
Oi--0 to 1 inch; slightly decomposed needles and twigs.
A--1 to 7 inches; dark grayish brown (10YR 4/2) silt loam, pale
brown (10YR 6/3) dry; weak medium subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; common fine and few medium and coarse roots; common very fine irregular pores; moderately acid (pH 5.6); clear smooth boundary. (2 to 6 inches thick)
Bw1--7 to 12 inches; yellowish brown (10YR 5/4) silty clay loam,
very pale brown (10YR 7/3) dry; weak medium subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; common fine and few medium and coarse roots; common very fine irregular pores; moderately acid (pH 5.6); clear smooth boundary. (5 to 11 inches thick)
Bw2--12 to 17 inches; light yellowish brown (2.5Y 6/4) silty clay, very pale brown (10YR 8/2) dry; weak coarse subangular blocky structure; slightly hard, very friable, moderately sticky and moderately plastic, common fine roots; few fine tubular and common very fine irregular pores; moderately acid (pH 5.6) clear smooth boundary. (4 to 6 inches thick)
BC1--17 to 22 inches; olive (5Y 5/3) silty clay, pale yellow (5Y 8/2) dry; common fine faint light yellowish brown (2.5Y 6/4) mottles; weak coarse prismatic structure parting to moderate medium subangular blocky; hard, firm, moderately sticky and very plastic; common fine roots; few fine tubular pores; moderately acid (pH 5.8) clear smooth boundary. (0 to 5 inches thick)
BC2--22 to 29 inches; olive gray (5Y 5/2) silty clay, light gray (5Y 7/2) dry; few fine faint light yellowish brown (2.5Y 6/4) mottles; weak coarse prismatic structure parting to weak coarse subangular blocky; hard, firm, moderately sticky and very plastic; few very fine and fine roots; few very fine tubular pores; moderately acid (pH 5.8); clear smooth boundary. (6 to 20 inches thick)
C--29 to 61 inches; olive gray (5Y 5/2) clay, pale yellow (5Y 7/3) dry; massive; hard, firm, very sticky, very plastic; very few irregular pores; moderately acid (pH 6.0).
TYPE LOCATION: Skagit County, Washington; approximately 1,600 feet south and 2,400 feet east of the northwest corner of sec. 3, T. 35 N., R. 5 E.
RANGE IN CHARACTERISTICS: Solum depth ranges from 17 to 35 inches. Mean annual soil temperature is 50 to 54 degrees F.
The A horizon has value of 3 or 4 moist, 5 or 6 dry, and chroma of 2 or 3 moist and dry.
The Bw horizon has hue of 2.5Y or 10YR, value of 4 through 6 moist, 6 through 8 dry, and chroma of 2 through 4 moist and dry. It is silt loam, silty clay loam, or silty clay. Clay content ranges from 13 to 45 percent.
The BC horizon has hue of 2.5Y or 5Y, value of 5 or 6 moist, 6 through 8 dry, and chroma of 2 through 4 moist and dry. It is silty clay loam or silty clay. Clay content is 35 to 45 percent.
The C horizon has value of 5 or 6 moist, 6 through 8 dry, and chroma of 2 or 3 moist and dry. it is silty clay or clay. Clay content is 40 to 65 percent.
COMPETING SERIES: This is the Quilcene series. Quilcene soils have a paralithic contact at a depth of 20 to 40 inches.
GEOGRAPHIC SETTING: Hoogdal soils are on plateaus and terrace escarpments at elevations of 50 to 300 feet. Slopes are 8 to 60 percent. The soils formed in loess and glaciolacustrine sediments. The mean annual temperature varies from 50 to 53 degrees F., and the mean annual precipitation varies from 35 to 50 inches. Mean January temperature is 39 degrees F., and mean July temperature is 62 degrees F. The frost-frees season is 160 to 220 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Barneston, Bow, Indianola, Skipopa, Squires, and Tokul soils. Barneston soils are sandy-skeletal. Bow soils have an argillic horizon. Indianola soils are sandy. Skipopa soils are medial over clayey. Squires soils are 20 to 40 inches deep to a lithic contact. Tokul soils are 20 to 40 inches deep to a duripan.
DRAINAGE AND PERMEABILITY: Moderately well drained; slow to medium runoff; slow permeability.
USE AND VEGETATION: Used for pasture and woodland. Native vegetation includes Douglas-fir, western hemlock, western redcedar, red alder, red huckleberry, Oregon-grape; western swordfern, and salmonberry.
DISTRIBUTION AND EXTENT: Northwestern Washington. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Skagit County, Washington, 1981.
REMARKS: Classification revised 1/00 based on Soil Taxonomy, 2nd edition from Aquic Dystric Xerochrepts to Aquic Dystroxerepts.
Diagnostic horizon and features recognized in this pedon:
Ochric epipedon - from 1 to 7 inches
Cambic horizon - from 7 to 29 inches