The average annual precipitation is about 9 to 12 inches. The frost-free period is 100 to 140 days. These are the Ackett , Lud , Udaho and Weash soils. Ackett soils are fine textured. Lud soils have fine textured argillic horizons.
Udaho soils are loamy-skeletal.
Weash soils have ashy mineralogy. Ackett and Weash soils occur on lower terraces. Lud soils occur on higher terraces. Udaho soils occur on sideslopes. Chuska soils are used for rangeland and irrigated cropland.