The Andres series consists of very deep, somewhat poorly drained soils formed in loamy outwash and in the underlying silty till on till plains. A mantle of loess or other silty material, as much as 24 inches thick, overlies the outwash in many pedons.
Permeability is moderately slow.
Slope ranges from 0 to 4 percent. Andres silt loam - on a nearly level slope in a cultivated field at an elevation of 633 feet. 41 degrees 02 minutes 53 seconds N., and long. The depth to the base of soil development ranges from 36 to 60 inches. The mollic epipedon ranges from 10 to 20 inches in thickness.