- Version 1.00: September 11, 1998
- Version 1.10: July 29, 1999
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- Added information pages and data for all quadrangles in Arizona, California, Colorado, Hawaii, Idaho, Iowa, Michigan, Minnesota, Nebraska, Nevada, New Mexico, North Dakota, Oregon, South Dakota, Utah, Washington, Wyoming.
- Version 1.20: August 07, 2000
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- Added information pages and data for all quadrangles in Alaska, Kansas, Oklahoma, and Texas. Information pages and data added for selected quadrangles in Maine, New Hampshire, and Vermont. Added three new fields (WELLUSE2, WELLAGE, WLAGECNF) to all water data files.
- Version 1.30: September 11, 2001
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- Added information pages and data for all quadrangles in Alabama, Arkansas, Illinois, Indiana, Florida, Georgia, Louisiana, Missouri, Mississippi, North Carolina, South Carolina, and Tennessee. Updated all Open-File 97-492 web pages to conform with Federal Standards mandated by Section 508 of the Rehabilitation Act.
- Version 1.40: January 13, 2006
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- Added information pages and data for all quadrangles in Connecticut, Delaware, Kentucky, Maine, Maryland, New Hampshire, New Jersey, Ohio, Pennsylvania, Vermont, Virginia, and West Virginia. Changed data download links on all pages to access a new on-line interactive database that replaces the formerly available, cumbersome, individually-compressed data download files.
- Version 1.41: February 23, 2006
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- Quadrangle web pages rewritten to increase consistency between pages and to better document the reformatting process.
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