My apologies to all. I had it backwards. The photo was Lake Eufaula State Park. My earlier photos, which I thought were Eufaula were actually a prior stop. Which turns out to be Lake Thunderbird SP. (I think). We were on a route from Oklahoma City to St. Louis, MO via Lost Bridge North Park, Beaver Lake area, through Montauk SP, MO to St. Louis.
The problem we had, was we had a map and an itinerary, both different from each other and also different from our actual route, which often does change, but we didn't update either map or itinerary.
Thanks for all your help.
Our 2351D Phoenix Cruiser, Jack, has turned us from campers into RVers and loving it!