Udic moisture regime. There are no competing series. Elkridge soils are on canyon sides and footslopes at elevations of 1,600 to 4,000 feet and have slopes of 20 to 70 percent. These soils have developed in volcanic ash and loess over material weathered from basalt rock. The average annual precipitation varies from 30 to 55 inches and the frost-free period is 50 to 110 days.
Grangemont soils are fine-silty and are on plateaus.
Kauder soils are fine-silty, have a fragipan and are on plateaus. Riswold soils are ashy over loamy and are on canyon sides. This soil is used for timber production, woodland grazing, wildlife habitat, recreation and watershed. The natural vegetation is western red cedar, grand fir, Douglas fir, western larch, queencup beadlily, goldthread, Myrtle pachystima, sweetscented bedstraw and common prince's pine. Clearwater County, Idaho.