Investigators have not released an apparent cause of death, nor said how long the body might have been there. Authorities say the body is a Caucasian woman in her 60s, and had not been identified on Wednesday afternoon.

A visitor from Florida, George Willis, told KXAN he was walking in the park and saw something red in the water. He walked over to see what it was, thinking it was a raft.

Then he saw the woman's ponytail, screamed to help her, and then realized she wasn't breathing. That's when he ran to alert park officials.

The woman was fully clothed, wearing a red jacket, and appeared to be dressed for colder temperatures, Willis said.