Spofford soils have natric horizons. Walvan soils are dominantly volcanic ash. Used for dryland cropland, irrigated cropland and some is used for range. Native vegetation is bluebunch wheatgrass, Sandberg bluegrass, big bluegrass, arrowleaf balsamroot, western yarrow, and sagebrush. Southeastern Washington and northeastern Oregon.
Series is extensive.
Walla Walla County, Washington, 1902. Diagnostic horizons and features recognized in this pedon are a mollic epipedon from the surface to 18 inches, a cambic horizon from 18 to 45 inches, and a zone of carbonate accumulation from 45 to 60 inches.