The Mentor series consists of very deep, well drained soils formed in silty lacustrine material. These soils are on terraces, lake plains, and outwash plains.
Permeability is moderate.
Slope ranges from 0 to 70 percent. Depth to the base of the argillic horizon ranges from 30 to 50 inches. Solum thickness ranges from 36 to 60 inches. Carbonates are present below 50 inches in some pedons. Depth to the base of the ochric epipedon ranges from 6 to 10 inches.