I had my boat out on the Neosho while it was realy up and I found a realy deep hole. It was where a pretty wide creek flows in. I would say it is about 20-25 feet deep. But that was also with the river up. It is weird because it is realy only about 20-30 feet wide and all the water around it is only about 4-5 feet deep. Except for the side that opens to the creek. I am going to fish it next time I go out. Me and a friend set at the mouth of the creek and caught 3 channel.