How to reach:
To reach the tidal bench marks from Scapoose Post Office, proceed south on Highway 30 for 6 km (4 mi) to milepost 16.8, then turn left and proceed 0.16 km (0.1 mi) ESE down the hill and across the railroad tracks on lower Rocky Point Road, then bear a sharp left and proceed 0.16 km (0.1 mi) north to the Rocky Point Parking lot. The bench marks are located along the east side of Highway 30. Two bubbler gauges were housed in the attic of the Rocky Point Marina store. Orifices were mounted on iron pipes welded to the dock pilings.