The Presque Isle peninsula forms Presque Isle Bay, which serves as a natural harbor for Erie. During the 19th century, as Lake Erie navigation grew more important, shipping aids were built on Presque Isle. As of 2007, two main lighthouses can be found in the park. The Erie Harbor North Pier Light began as a wooden tower, erected in 1830. In 1858, a stronger steel structure was brought from France and installed at Erie to replace the wooden beacon, which had been damaged by a schooner. This light still stands at the far eastern side of the park, near the inlet between the lake and the bay.