The Indiana Bass Federation and Indiana DNR collaborative Reservoir Habitat Enhancement Project has been adding structure to our Indiana reservoirs and lakes since 2016. In an effort to further help anglers locate and fish these structures, the Indiana DNR has created .gpx files that locate the structures in the maps on your electronics. Links to download .gpx files for Patoka, Harden, Sullivan, Monroe, Salamonie, and Mississinewa, along with more information about the project, are available on the Indiana DNR Reservoir Habitat Enhancement Program page.
Also, here are YouTube tutorials for loading .gpx files into your mapping electronics for Lowrance or Humminbird units.