Florida Santa Rosa County route 399
1970 specification highway marker.
Santa Rosa County 399 pentagon posted along U.S. 98 east approaching the Navarre Beach Causeway. It is unclear if this route is still State Road 399, or a County Road. Either way, this is the only reference of the bridge as "399".
Photo by Alex Nitzman / Brent Ivy, 3/10/2009.