Puget, Skagit, and Sumas soils lack organic layers in the particle-size control section. These soils are subject to occasional, brief periods of flooding from November through April. An apparent water table is as high as 0 to 1 foot from November through May unless drained. Most Snohomish soils are drained and used for cropland, hay, and pasture. The native vegetation was red alder, western redcedar, western hemlock, and sitka spruce with an understory of sedges, vine maple, salmonberry, redosier dogwood, Douglas spirea, sweetscented bedstraw, devilsclub, ladyfern, red elderberry, red huckleberry, western swordfern, skunkcabbage, salmonberry, and Douglas spirea.
Series is of small extent.
Snohomish County, Washington, 1938. Partial laboratory data are available on these soils. Diagnostic horizons and features recognized in this pedon are an ochric epipedon from the surface to 13 inches, an irregular decrease in organic carbon with depth and a lithologic change from alluvium to organic deposits at 30 inches.