Sandstone Falls is a small tick mark on older topo maps along Johnson Creek in a rather thick and inaccessible area of the Ontonagon River. Small stagnant ponds and recent logging has spurred a rapid boon of beaver activity on the tiny creek. The only drops visible along the creek are the small trickles through the beaver dams.
Turn west onto Burma Road (Forest 730) from US-45, about 7.5 miles north of Bruce Crossing. Take the forest access road for 5.4 miles and park on the two-track to the right, the one that's gated a short distance down. From here you basically want to go north and there are plenty of two-tracks to choose from. If you just head straight with no turns you'll end up in a clear-cut area near Schatt Creek. Turn left, crossing the creek, going north and west until you bump into Johnson Creek. There are other, more windy routes, that will require either a GPS or careful map reading.