(From Wikipedia) The Wilma H. Schiermeier Olentangy River Wetland Research Park is an experimental wetland complex located adjacent to the campus of The Ohio State University in Columbus, Ohio, United States and is part of the School of Environment and Natural Resources at the university. Begun in 1992, the park has developed into a multitude of different habitats and setups which are used by OSU faculty and students for research.

OSU has several web pages with information on the wetlands:
Overview

Ohio Agricultural Research and Development Center info

School of Environment and Natural Resources info

 The most recent delineation from OSU for their Billabong wetland. The points show the actual boundary and the light blue shape is from the National Wetland Inventory (based on Satellites back in early 2000's).