The upper portion of it is on SGL 40. In theory, you could park at one of the SGL lots to the south along 940, and bushwhack a hike north to Fawn, staying in SGL the whole time, if you wanted to. (Pack your orange this time of year.) But I’d suggest you likely don’t want to. Fawn Run will be half a step across kind of tiny, and who knows if you can even hike to it. Tons of rhodo in that general area. Plenty of other nearby options on public land that don’t present the issues Fawn does. (I’ve never fished it, and have no intention to, FWIW. Just suggesting you make sure you think the juice will be worth the squeeze before putting in the effort to attempt it.)