The Passport series consists of very deep, somewhat poorly drained soils on till plains. They formed in loamy materials and in the underlying till that contains a strongly developed paleosol.
Permeability is moderately slow in the loamy materials and slow in the underlying till.
Slopes range from 2 to 18 percent. The depth to the base of the argillic horizon ranges from 40 to 80 inches. The depth to till ranges from 20 to 45 inches. The particle-size control section averages between 18 and 35 percent clay and between 15 and 35 percent fine sand or coarser. The depth to carbonates is more than 60 inches.