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• Organization: Department of the Interior
• Dataset Last Updated: November 17, 2020 at 12:00 AM

This data set represents the extent of the Silurian Devonian aquifers in the states of Michigan, Wisconsin, Illinois, Indiana, Ohio, Kentucky, and Tennessee.

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• Organization: Department of the Interior
• Dataset Last Updated: November 17, 2020 at 12:00 AM

This geodatabase includes spatial datasets that represent the Silurian-Devonian aquifers in the States of Illinois, Indiana, Iowa, Kentucky, Michigan, Missouri, Ohio, Tennessee, and Wisconsin....

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• Organization: Department of the Interior
• Dataset Last Updated: July 14, 2026 at 12:00 AM

Data from 44 aquifer tests conducted on wells completed in the Silurian-Devonian aquifers within and around Johnson County, Iowa, have been gathered and reformatted to enable easier data analysis...

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• Organization: Department of the Interior
• Dataset Last Updated: August 21, 2020 at 12:00 AM

This dataset contains estimates of water withdrawals from 66 principal aquifers and "other" non-principal aquifers during 2015 for various categories of use in each county or county equivalent in...

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• Organization: Department of the Interior
• Dataset Last Updated: July 17, 2026 at 12:00 AM

The U.S. Geological Survey (USGS) is developing a National Extent Hydrogeologic Framework (NEHF) for the conterminous United States (CONUS). This digital data set is one of several conceptually...

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