How to reach:
To reach the tidal bench marks from the intersection of the Mayport Ferry and Florida Highway A1A, proceed north on Highway A1A for 15.0 km (9.3 mi) to the Swing Span Highway Bridge over the Nassau River. The bench marks are located near the south end of the bridge. The tide gage and staff were located 37.0 m (120.0 ft) SE of the center of the Swing Span at the extreme NE corner of the SE section of the wooden fence. NOTE: The bridge and adjacent section of roadway are no longer used for highway travel and are now used for recreational purposes.