Slopes are 0 to 12 percent. The soils formed in mixed alluvium from glacial outwash or glacial till. Elevations are 3,800 to 5,200 feet. Average annual precipitation is 22 to 24 inches. These are the Archabal , Blackwell , and Melton soils.
Archabal soils are well drained.
Blackwell and Melton soils are poorly drained and do not have a Bw horizon. Used mainly for pasture, small grains, clover, and seed potatoes. Native vegetation is mainly grass, forbs, and some shrubs. The soil is inextensive. Valley Area, Idaho, 1977.