Recent video from youtuber exploring the penisula. It may be part of a damaged bridge over soft sand or drainage gully.
>This is a beautiful Florida State Park that offers miles of pristine white sand beaches with very little traffic and congestion when compared to other popular beach destinations. The road is still in repair from hurricane Michael so only way to see the entire park is to hike or take a boat.
https://www.youtube.com/watch?v=nrFuoH4Vs7I