LOCATION NOOKACHAMPS WAEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, nonacid, mesic Fluvaquentic Endoaquepts
TYPICAL PEDON: Nookachamps silt loam-forage. (Colors are for moist soil unless otherwise noted. All textures are apparent field textures.)
Ap--0 to 9 inches; olive brown (2.5Y 4/4) silt loam, light yellowish brown (10YR 6/4) dry; common fine faint gray (5Y 5/1) redox depletions and common fine distinct strong brown (7.5YR 5/6) redox concentrations; moderate medium subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; common very fine, fine, medium and coarse roots; common very fine constricted random irregular pores; slightly acid (pH 6.5); abrupt smooth boundary. (8 to 12 inches thick)
Bg1--9 to 26 inches; gray (N6/0) silt loam, light gray (5Y 7/1) dry; many medium distinct yellowish brown (10YR 5/8) redox concentrations; moderate very coarse subangular blocky structure; hard, friable, moderately sticky and moderately plastic; common very fine roots; common very fine constricted random irregular pores; neutral (pH 6.6); gradual smooth boundary. (10 to 20 inches thick)
Bg2--26 to 32 inches; gray (5Y 5/1) silt loam, light gray (N 7/0) dry; many moderate distinct strong brown (7.5YR 5/8) redox concentrations; moderate coarse prismatic structure; hard, friable, moderately sticky and moderately plastic; few very fine roots; common very fine constricted random irregular pores; neutral (pH 7.2); abrupt smooth boundary. (5 to 10 inches thick)
Cg--32 to 60 inches; gray (N 6/0) silt loam, light gray (N 7/0) dry; common medium distinct yellowish brown (10YR 5/8) redox concentrations around tubular pores; massive; hard, friable, moderately sticky and moderately plastic; few very fine roots; many medium continuous vertical tubular pores; organic strata of peat material 1/4 inch thick at 32-inch depth; pink mottling at 60-inch depth; neutral (pH 7.0).
TYPE LOCATION: Skagit County, Washington; 1-1/2 miles SE of Clear Lake, 3,350 feet north of southwest corner sec. 18, T. 34 N., R., 5 E.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 48 to 53 degrees F. The solum is 24 to 40 inches thick. The particle-size control section has 18 to 35 percent clay and less than 15 percent fine sand or coarser. Depth to the apparent water table is 0 to 18 inches during the wet season.
The A horizon has hue of 2.5Y or 10YR, value of 5 through 7 dry, chroma of 1, 2 or 3 moist and dry. It is moderately acid or slightly acid.
The B horizon has hue of 2.5Y, 5Y or N, value of 4 through 7 moist and dry and chroma of 0, 1 or 2 moist or dry. It is silt loam or silty clay loam. This horizon is slightly acid or neutral.
The C horizon has hue of 5Y or N, value of 5 through 7 moist and dry and chroma of 0 or 1 moist and dry. It is silt loam or silty clay loam. The thin strata of peat material are lacking in some pedons. This horizon is slightly acid or neutral.
COMPETING SERIES: These are the Birds, Killbuck, Melvin, Petrolia, Rafton, Skagit and Woodinville series. Birds, Killbuck, Melvin, and Petrolia soils are in a climate with greater difference in summer and winter temperature and that receive most of the precipitation in spring and summer. Also, Birds soils have hue of 10YR and lack a B horizon. Killbuck soils have a buried dark colored A horizon in the control section. Melvin soils have a mean annual soil temperature of 55 to 59 degrees F. Petrolia soils lack a B horizon. Rafton soils are saturated throughout the year and are flooded by fresh water during high tides unless diked and drained. Woodinville soils have a solum more than 40 inches thick and are medium acid to very strongly acid in the control section. Skagit soils have over 20 percent volcanic glass in the control section.
GEOGRAPHIC SETTING: These soils are on stream floodplains at elevations of 45 to 250 feet. They formed in alluvium derived mainly from phyllite and lacustrine material from ponded stream overflow. Mean annual precipitation is 40 to 55 inches. Mean January temperature is about 36 degrees F. and mean July temperature is about 64 degrees F. Mean annual temperature is about 50 degrees F. The frost-free season is 160 to 210 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Snohomish and Wichersham series. Snohomish soils are underlain by organic material 10 or more inches thick. Wichersham soils are coarse-loamy over sandy or sandy-skeletal.
DRAINAGE AND PERMEABILITY: Poorly drained; slow runoff; slow permeability. Water table is at a depth of 0 to 18 inches during winter and early spring.
USE AND VEGETATION: Nookachamps soils are used for cropland. Forage crops are the major crops. Native vegetation is western redcedar, western hemlock, red alder and grasses.
DISTRIBUTION AND EXTENT: Northwestern Washington. This series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Skagit County, Washington, 1950.
REMARKS:
ADDITIONAL DATA: Laboratory data are available on this soil, Soil Sample Numbers: S79WA000-000, 79T7704-7705 Lincoln, Nebraska.