A lagoon within the park was once part of Pelham Bay, separating Hunter and Twin Islands from the mainland, and was called LeRoy's Bay until the mid-20th century. It was popular for rowing regattas, but could not be used for regulation rowing races as it was blocked by the causeway to Hunter Island. By 1902, there were calls to remove the causeway so LeRoy's Bay could be used as a raceway. The New York City Department of Public Parks decided to create a "temporary" wooden bridge and remove the causeway to allow the bay's tides to flow freely.