Texture is silt loam, loam, clay loam and silty clay loam averaging between 18 and 32 percent clay. Some pedons have thin strata of very fine sandy loam, loam, fine sandy loam or loamy fine sand. The 2Cg horizon is below a depth of 40 inches and has colors similar to the Cg horizon. This layer is loamy sand, fine sand, sand, coarse sand or gravelly sand. It is stratified in places with silt loam to sandy loam textures.
Reaction is neutral through moderately alkaline.
These are the Blackoar , Gorham , Lummi , and Wapato series in the same family, and the Colo , Gibbon , Lamo , McCook , Roxbury , and Wann soils. The Blackoar soils are saturated higher in the profile for longer periods. Lummi soils do not have carbonates in the series control section. They have a coastal climate. Wapato soils have more than 35 percent clay in the lower part of the particle size control section.