How to report large hole forming.

There is a large hole forming on Park Ave. between N. Colonial and N. Sheppard right past Texas Inn as you are headed into the Museum district. I am not sure if it is considered a sink hole or a pot hole and how to report it. I was out of town for a week and just drove past it and she has gotten bigger. I don’t want it to become a Strawberry St. part 2. Any suggestions?