Old maps show Sandtown being further north, more directly west of Chouteau or the industrial park. That seems unlikely to me (maybe it is a different "Sandtown"). Though Watie and Gano didn't want to be between the Grand and Verdigris before they knew where the Union forces were, they didn't want the train to pass them either so I would expect they crossed the Verdigris further south. Also, it means they would have had to move a considerable distance southeast to where I believe the haying operations were.
They must have had information on the locations of the haying operations and attacked the northern most one, which was about 15 miles from Ft Gibson. Chouteau is further than that from Ft Gibson. Even coming up the east side of the Grand from Ft Gibson and then crossing, 15 miles give or take is around Wagoner. The road on the east side of the Grand crossed Fourteen Mile Creek fourteen miles from Ft Gibson.
That's about the extent of what I think I know. Seems I found reference to Sandtown in the Slave Narratives -- former slaves of the Perrymans I think -- but I'd have to hunt again. I don't recall it giving precise locations but was in the general vicinity of the Hwy 51 bridge.