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THE NEW IOWA GEOLOGICAL SURVEY IS NOW PART OF THE UNIVERSITY OF IOWA THROUGH AN AGREEMENT BETWEEN IDNR AND THE UNIVERSITY OF IOWA


THE AQUIFER CHARACTERIZATION AND DROUGHT ASSESSMENT OF THE ROCK RIVER ALLUVIAL AQUIFER IN NORTHWEST IOWA IS NOW AVAILABLE

Bedrock surface elevation map showing bedrock highs (reds) and lows (greens).
The Iowa Geological & Water Survey (IGWS) recently completed an aquifer characterization and drought assessment of the Rock River alluvial aquifer in northwest Iowa.  The study evaluates the alluvial aquifer to aid in future water supply development.  Existing geologic information combined with geophysical surveys and drilling were compiled to better understand the extent and thicknesses of the coarse grained alluvium.  Hydrogeologic parameters were also gathered in order to estimate well potential in the aquifer.   


THE GROUNDWATER AVAILABILITY MODELING INVESTIGATION FOR THE HUDSON AQUIFER SIOUX COUNTY, IOWA IS NOW AVAILABLE

Isopach map showing the sand and gravel thickness for the Hudson aquifer.
The Iowa Geological and Water Survey (IGWS) recently completed a groundwater investigation of the Hudson Aquifer in Sioux County, Iowa. The current users include the Rock Valley Rural Water District (RVRWD), and twenty-one irrigation wells.  Based on the results of the evaluation, an increase of 1.5 million gallons per day (mgd) in water production may be possible from two or more additional wells in the existing RVRWD well field.

 
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GeoSam Database STORET Database IOWAWATER Database NRGIS Database


Bedrock Geologic Map of Iowa (PDF)
The Bedrock Geologic Map of Iowa portrays the current interpretation of the distribution of various bedrock stratigraphic units present at the bedrock surface. More...


New well record form for well drillers.
 
Well contractors can use the latest Well Record Form, then mail, e-mail or fax a completed form to the IGWS.