The Gillespie Dam Petroglyphs is a site between Arlington and Gila Bend, Arizona that we haven't visited yet. For turn-by-turn directions enter 'Gillespie Dam Arlington' into your driving app. There are 4 places with petroglyphs at Gillespie Dam. Three of them are around the main parking area on the west side of the bridge and the other is about 2,000 feet down the Enterprise Road.
Included with this post is the GPS file and map that we plan to use for our first visit. If you don't want to wait for us to get around to it feel free to try the GPS file and map for yourself. With no guarantee, of course, but they most often prove valuable for us.