The Rush series consists of well drained soils on outwash plains, terraces, kames, and eskers. They formed in silty sediments or loess and in the underlying loamy and gravelly outwash. These are very deep soils that are moderately deep to calcareous, stratified sandy and gravelly outwash.
Permeability is moderate in the solum and very rapid in the underlying material.
Slopes range from 0 to 12 percent. Rush silt loam - on a 1 percent slope in a cultivated field at an elevation of 775 feet above sea level. 40 degrees 04 minutes 40.21 seconds N., and long. The thickness of the solum ranges from 40 to 80 inches. The silty material is 24 to 40 inches thick.