Lee county is situated in the extreme southeastern comer of Iowa partly within the Mississippi loess soil area and partly in the southern Iowa loess area. Almost 80 percent of the soils of the county are loess soils, the other types being terrace and bottomland soils..
Stevenson, W. H. and Brown, P. E., "Soil Survey of Iowa, Report No. 5—Lee County" (1918). Soil Survey Reports. 1.