This lake looks to be another 45 + or - minutes north on I-35 in OK and to the east of I-35 near Davis/Sulphur OK from Lake Murray just north of the border. It is called Lake of the Arbuckles. ?? 

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I fished and swam there with my cousins when I was a kid. They lived in Sulphur, OK.
I'd be up to give it a try if you decide to go.