Chances are really good that the turkeys here will roost over the water. If that road is a road that you can hunt then I would be standing on it at daybreak. That should give you the ability to move wherever you need to get around them when they fly down. I would just wait to see where they go. Unless you have a day to go scout, in that case you should be able to find some fresh tracks or scratching to indicate where they are spending there time. Other than that just get in there and "live"with them. Good luck!