How to reach: To reach the tidal bench marks from U.S. Highway I 10, proceed west on I 10 to exit 220 (310 south), proceed on 310 south for 4.8 km (3.0 mi) to LA HWY 61 to Norco, LA, go 10.6 km (6.6 mi) along LA 61 to the Bonnet Carre Spillway Road, continue 5.5 km (3.4 mi) along Spillway Road to a steel gate with a lock, proceed thru the gate turn right and proced to the Marsh Duck Hunt Club. The bench marks are in the vicinity of the Marsh Duck Hunt Club and west along the railroad and I-10 East. The tide gauge is located at the wooden pier on the north side of the Hunt Club.