There is one published report (USGS Water-Resources Investigations Report 88-4117, Abstract) on the Iowa River covering the area from Belle Plaine to Amana. This report covers the occurrence of agricultural chemicals in the aquifer with limited stratigraphic information. Additional stratigraphic information, including the results of seismic surveys, are on file at the Geological Survey Bureau. For more information call Lynette Seigley (Lynette.Seigley@dnr.iowa.gov)at (319)335-1575.
For information on the Geological Survey Bureau's monitoring of the Iowa River alluvial aquifer, click here.