Grand Isle, LA tide times

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.

Marine-conditions data not available for this station. Wind, swell and water temperature ride along with Open-Meteo Marine; gauge-only stations (e.g. UK EA Flood) publish water level only.

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

The angler tradition for major/minor fishing windows: major ≈3-hour windows around moon transit and opposition; minor ≈2-hour windows around moonrise and moonset. Times are America/Chicago local. Folk tradition, not a scientific forecast.

Next spring tide on Sun 17 May (range 0.6m / 2.1ft). Last neap on Fri 15 May. Next neap on Sat 23 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 in Louisiana, accessible by a single highway across Barataria Bay on LA-1 — a road that regularly floods at high water. The island faces south into the Gulf of Mexico but the defining fact about Grand Isle is the land loss rate. Louisiana is losing coastal land faster than almost anywhere in the US; the island has shrunk by more than half in living memory, and the Gulf-facing beach has retreated to within metres of the road in some sections. Tidal pattern is diurnal (one high and one low per day), with mean range under 0.5 metres — but wind-driven water level changes dominate. Fishing is the raison d'être of Grand Isle. The island is one of the premier inshore and offshore fishing destinations in the northern Gulf. Inshore, the Barataria Basin marsh system behind the island holds red drum (redfish), speckled trout, and flounder in the channels between the marsh islands. The marsh grass edges and oyster reefs are the key structure. Offshore, the oil platform structures (standing in 30 to 100 metres of water offshore) provide a unique ecosystem of baitfish, amberjack, cobia, red snapper, and grouper. The oil platform fishing culture is genuinely unique to the northern Gulf. Hundreds of platforms — some active, most decommissioned — act as artificial reefs and concentrate fish that anglers can legally access. Platforms within state waters (9 nautical miles) are accessible to small boats; beyond that, charter boats from Grand Isle run overnight trips to the deeper federal water platforms for red snapper and grouper during the federally managed open season. The Grand Isle State Park occupies the east end of the island with a beach access, camping, fishing pier, and boat launch. The park beach is one of the cleaner Gulf beaches in Louisiana — the natural sand and shell beach, though narrow, is maintained as public access. Hurricane Ida (2021) caused significant damage; the park and infrastructure have been progressively rebuilt. Birding is exceptional during spring migration. The island is a first-landfall site for trans-Gulf migrants arriving from the Yucatan — songbirds exhausted by the overnight 900-kilometre crossing fall into the trees and shrubs on the island at dawn in late April. Fallout events (when a weather front traps migrants) produce extraordinary concentrations of warblers, tanagers, vireos, and buntings in the island vegetation. Predictions on this page come from Open-Meteo Marine, a gridded global ocean model. Accuracy is typically within plus or minus 45 minutes on timing and 0.2 to 0.3 metres on height — model-derived, not from a local gauge. For authoritative US tide data, consult NOAA CO-OPS at tidesandcurrents.noaa.gov.