Savage, welcome to Pond Boss!
F/Rod gives good advice on some questions that may be answered by whoever the builders are.
With the 'muddy' water, there'll be no way to tell how deep the pond may be from sight, but you may be able to take a john boat or float tube out and check depths.
If the 'pond' was built to handle run off during construction, I don't think it will be much more than a few feet deep. That can easily dry up in Texas summers.
