MODPATH version 7 is the fourth major release since its original publication. Previous versions were documented in USGS Open-File Reports 89-381 and 94-464 and in USGS Techniques and Methods 6-A41. The current release of MODPATH version 7 (7.2.001) works with MODFLOW-2005, MODFLOW-USG, and MODFLOW-6. Support for unstructured grids in MODFLOW-USG and MODFLOW-6 is limited to smoothed, rectangular-based quadtree and quadpatch grids. In addition to unstructured grid support, input and output formats for MODPATH also have been modified to minimize the difference between MODPATH simulations based on the different versions of MODFLOW.
Note: MODPATH version 7 only works with quadtree and quadpatch grids if they have a north-south orientation
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