Anyone willing to share information on places to shoot? I am coming to Gregory next week, welcome any info on a backup shooting area.

I think you'll find a lot more dogs across the river, not many on the East Side.

You need to be on the west side of the Missouri River. From what I hear there has been a lot of flooding lately.
Make some phone calls. Google the Fish and Game, or the Indian Reservations.

The country changes massively east of the Missouri River. Your best luck will be west.