How to reach:
To reach the tidal bench marks from the old lighthouse at Port Isabel, proceed west on State Highway 100 for 1.4 km (0.9 mi) to a road leading to Port Isabel Turning Basin. Turn left onto the road and continue south for 1.1 km (0.7 mi) to the Port Isabel Navigation District warehouse. The bench marks are in the vicinity of the warehouse, Port Road, and the Port Isabel High School complex. The tide gage and staff are approximately 24.4 m (80 ft) north of the NE corner of the warehouse.