Predictions: NOAA CO-OPS station 8761724 — heights relative to MLLW.

Harmonic prediction from the official tide authority. Very high accuracy under normal conditions; storm surge may shift actual water level. Not for navigation.

Predictions: NOAA CO-OPS station 8761724 — heights relative to MLLW. · Not for navigation.

The angler tradition that rates each day for fish-bite likelihood using moon transits and rise/set. One to five stars, not a scientific forecast.

• Mon
  ★★★★★
• Tue
  ★★★★★
• Wed
  ★★★★★
• Thu
  ★★★★★
• Fri
  ★★★★★
• Sat
  ★★★★★
• Sun
  ★★★★★

Next spring tide on Sun 03 May (range 0.4m / 1.4ft). Last neap on Sun 26 Apr. Next neap on Mon 11 May.

Spring tides cluster around new and full moons (biggest swings). Neap tides land on quarter moons (smallest swings). See the spring tide and neap tide glossary entries for the why.

Grand Isle is the only inhabited barrier island on the Louisiana coast, a thin strip of sand fronting the Gulf of Mexico south of the Mississippi delta with Caminada Pass at its eastern end and Barataria Pass at its western. The NOAA gauge at Grand Isle is the canonical reference station for Louisiana tide prediction — the working tide source for the offshore oil and gas industry, the Port Fourchon supply boats running out to the deep-water rigs, and the inshore charter-fishing fleet working the Barataria estuary. The tide signature here is among the smallest and most diurnally-skewed in the lower 48: mean range is about 0.4 metres, with most of the lunar month producing a single high and a single low per day rather than the two-and-two semidiurnal pattern more common elsewhere. The astronomical forcing is small because the Gulf basin is broad, shallow, and partially enclosed; what dominates day-to-day water levels is wind and pressure rather than the moon. A sustained south wind across the Gulf can pile water against the marsh edge and lift levels 30 cm or more above predicted; a north wind can drop them by the same amount. Hurricane season runs June through November and tropical-cyclone surge can stack two to five metres on top of the tiny astronomical signal. Hurricane Katrina (2005) drove a peak of about 8.5 metres at Bay St Louis to the east; Hurricane Ida (2021) produced similar surges at Port Fourchon. Inshore at Caminada Pass and Barataria Bay, redfish and speckled-trout anglers time the change of tide for the major periods of feeding. Lowest spring lows around new and full moons widen the marsh-edge mudflats for shorebird walkers. NOAA CO-OPS station 8761724 supplies the harmonic predictions on this page; the National Hurricane Center is the authoritative real-time source during tropical landfall events.