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Water Resources of the United States

MODFLOW Data Extractor Program (Version 1.0)


EXTRACTOR is a program that extracts data from formatted and labeled MODFLOW head or drawdown files or from MODFLOW-GWT concentration or velocity files. The user specifies the number of rows, columns, and layers in the target data file, the desired time step or move number, and the range of rows, columns, and layers for which data should be extracted and written to a new text file. The new text file can then be imported into other data-analysis programs.


EXTRACTOR is a single executable file. It has been compiled for and tested on MS Windows-XP and Windows 2000 Professional. The program was compiled with Compaq Visual Fortan 6.0. There are no installation instructions (you simply need the executable file below). For instructions on how to use the program, see "Documentation" listed below.

Download Extractor.exe

Source Code

The source code for EXTRACTOR is included here to allow for compilation on other operating systems or optimization using other compilers. It is written in standard Fortran-90, and thus requires a compiler capable of using this form of code. (Recommened method for downloading -- right click on source code link, then "Save Link Target As...", then give file desired name if other than "extract.f")


Zinn, B.Z., and Konikow, L.F., 2005, MODFLOW Data Extractor Program: U.S. Geological Survey Open-File Report 2005-1143, 7 p.

This report is available online in Portable Document Format (PDF). If you do not have the Adobe Acrobat PDF Reader, it is available for free download from Adobe Systems Incorporated.

Download the Report (PDF, 194 KB).

Document Accessibility: Adobe Systems Incorporated has information about PDFs and the visually impaired. This information provides tools to help make PDF files accessible. These tools convert Adobe PDF documents into HTML or ASCII text, which then can be read by a number of common screen-reading programs that synthesize text as audible speech. In addition, an accessible version of Acrobat Reader 5.0 for Windows (English only), which contains support for screen readers, is available. These tools and the accessible reader may be obtained free from Adobe at Adobe Access.

Documentation Contents

U.S. Geological Survey
431 National Center
Reston, VA 20192

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