[Boardwalk Bluesboy]

Thanks for the photo, McDude. I did eventually find out the answer to my own question, thanks to Warren Huse. The footbridge was constructed in 1917 by Edward T. Milton, who owned the Lakeside House from 1913-1925. Milton erected the footbridge "to afford easier access to the Lakeside for auto parties". Here's a 2008 Motorcycle Week photo. The bridge looks really nice when it's lit up.