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Recent News:

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

Isopach map showing the sand and gravel thickness for the Hudson aquifer. 

 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.

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.                              

Additional recent news articles and publications from the Iowa Geological & Water Survey are also available in digital format.

Geologic Data
Water Quality Data
Iowater Data
G.I.S. Data 


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

A description and legend for the map are available in digital format.

Iowa Geological & Water Survey Well Record Form.

Well contractors can use the latest Well Record FormWell Record FormWell Record FormWell Record Form, then mail, e-mail or fax a completed form to the IGWS.


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