You might try the Lake Texoma COE Office - down behind the dam - for maps of the Public Land available on both sides of the pond.
The Hagarman Goose Refuge, on the bottom end of Big Mineral, did not however have nearly as many geese several weeks ago as I expected to see...but this was before the weather pattern got colder than a well digger's you know what just north of here & all the way to Santy Claus Land.
Remember Aesops Fables of the "Scorpion & and the Frog's" crossing the river...
... we must hang together, or we will ALL hang seperately, Ben Franklin..
Those who fail to learn from History are doomed to repeat it,Santayana