I used this app called Distance Measure. It gives me an area of 21,607 sq ft. That converted is 0.496 acres. The image in this app is from a year or so ago when the pond was low. So, I would say it fluctuates between just under 0.5 acres to a little over 0.5 acres. It is pretty full right now but will go down a few feet in the summer.

Attached Images
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NTHA - North Texas Half Acre
Cattle Ranch Ponds