How to reach:
To reach the tidal bench marks from the post office in Marathon, proceed 4.7 km (2.9 mi) SW along U.S. Highway 1 to the old Seven Mile Bridge, go 3.1 km (1.9 mi) on the old bridge to the ramp leading down from Seven Mile Bridge to Pigeon Key. The bench marks are located on the concrete bases of the old bridge piers and near the pool on the south end of the Key. The tide gage and staff were located on the dock at the north end of the Key. This bench mark network was also used for tide station 872 4032 which was located on the south end of the Key.