Mississippi and Atchafalaya Warm Into Prime Catfish Territory

What's Biting

What's Next

The full moon on May 31 sets the stage for the next several days. On the Mississippi and Atchafalaya, a full moon historically amplifies low-light feeding periods for catfish. With water at 76°F and flows still elevated, the window from dusk through midnight over the next two to three days could produce some of the better catfish action of the early summer season. Plan launches accordingly: an evening start timed around peak darkness, with rigs anchored in current seams on inside river bends, is the reliable late-May catfish setup.

Flow at 492,000 cfs means the river is carrying significant current. Watch the USGS gauge over the coming days for any downward trend. When high water begins to recede, baitfish and forage species that have scattered across flooded timber and flats start funneling back into main channels and cuts. That concentrating effect typically triggers some of the most predictable catfish, bass, and gar windows of the season. A drop of even 20,000 to 30,000 cfs can make a noticeable difference in where fish are holding and how accessible those spots become.

For catfish through the weekend, position near current breaks on inside bends of the main river and in the upper Atchafalaya where flow spreads and slows. Cut shad and skipjack fished on the bottom in 10 to 25 feet of water along channel edges is the standard approach. Blue catfish are the primary target at depth; channel cats work shallower inside eddies and along flooded willows.

Post-spawn largemouth bass should continue responding to offshore presentations in the Atchafalaya Basin as the week progresses. Tactical Bassin, covering post-spawn patterns this month, identifies isolated offshore structure as the key location: drifting outside flats, casting to visual cover, and using the wind to your advantage. Chatterbaits, dropshot rigs, and swimbaits are flagged as productive when the reaction bite is on. Apply those patterns to submerged timber edges and the deeper perimeters of backwater lakes throughout the basin.

Alligator gar should become increasingly active as surface temperatures stabilize above 75°F heading into June. Shallow coves, oxbow lakes, and slower backwater reaches of the Atchafalaya are the spots to target at dawn and dusk, particularly during this full moon phase.

Context

Late May on the lower Mississippi and Atchafalaya typically marks the transition from spring flood conditions to early summer patterns. Snowmelt and spring rainfall from the upper Midwest drive peak flows in April and May; a reading of 492,000 cfs at USGS gauge 07374000 on May 30 is elevated but falls within the expected range for this time of year. The lower Mississippi routinely carries 400,000 to 500,000 cfs during the late-spring runoff window before dropping toward a summer baseflow closer to 200,000 to 300,000 cfs through August.

Water at 76°F is on track with typical late-May conditions for this stretch. The lower Mississippi generally reaches 72 to 78°F by the end of May as solar heating overcomes any remaining cooler inflow from the upper basin. At 76°F, the river sits squarely in the prime summer catfish feeding range and above the threshold at which largemouth bass have typically completed spawning and begun their post-spawn recovery.

The Atchafalaya Basin, the largest river swamp in North America, historically peaks in flooding between March and May, with drawdown beginning in June. A late-May report at current flow levels suggests the basin is still in its high-water phase, which traditionally spreads fish across flooded timber and makes concentrating them more challenging. As drawdown gains momentum through June and July, fish compact back into main channels and deeper lakes, historically triggering some of the year's most reliable crappie and bass action as habitat compresses.

No charter captain reports, tackle-shop updates, or state agency fishing advisories specific to the Mississippi or Atchafalaya system arrived in this week's feed, so no direct 2026 season comparison is possible. LA Sea Grant remains an active resource for Louisiana fisheries research; anglers seeking current regulatory guidance for this region should consult them directly.