DeGrey, Highmore, and Walke soils are intermingled mainly on nearly level landscapes. Highmore soils do not have glacial till within a depths of 40 inches. The fine-loamy Glenham soils and the fine textured Raber soils are intermingled where the silty mantle is thinly deposited over glacial till. DeGrey and Walke soils have natric horizons. Mobridge and Onita soils have mollic epipedons more than 20 inches thick and are in swales and drainageways.
Surface runoff is slow on nearly level areas and medium on more sloping areas.
Permeability is moderate in the solum and moderately slow in the 2C horizons. Small grain, corn, and sorghum are the principal crops. Western wheatgrass, bluegrama, needleandthread, and green needlegrass are the main species in areas of native range. Central and south-central South Dakota east of the Missouri River. It is extensive.