The Tetonka series consists of very deep, poorly drained soils formed in local alluvium in depressions on uplands.
Permeability is slow.
Slopes are less than 2 percent. Tetonka silt loam - in a level enclosed depression in native grass. When described the soil was moist throughout. Depth to carbonate ranges from 30 to more than 60 inches. The maximum thickness of mollic colors ranges from 24 to 50 inches.