What Flat Lake offers and how to fish it

Flat Lake is a shallow, brackish body of water in Plaquemines Parish in southeast Louisiana, roughly 40 miles south of New Orleans. It sits in the Mississippi River Delta region where freshwater and saltwater mix, creating habitat that attracts redfish, spotted seatrout, and flounder. The lake is accessible by boat from several launch points, and the shallow depth — typically 2 to 4 feet — makes it suitable for wade fishing and poling skiffs as well as larger center-console boats.

The water here is tidal and influenced by the Mississippi River outflow, which means conditions shift with the tide and seasonal river discharge. Salinity varies throughout the year: higher in late summer and fall, lower in spring when river flow increases. This variation affects which species are present and how actively they feed. The lake's shallow, muddy bottom and marsh edges create ideal conditions for sight-fishing redfish and seatrout, particularly during calm, clear-water periods.

Key Takeaways

  • Flat Lake is a shallow brackish lake in Plaquemines Parish best fished by boat, with access from multiple public launch points including Venice Marina and Buras.
  • Redfish and spotted seatrout are the primary target species, with flounder and black drum also present depending on season and water conditions.
  • Tidal movement and Mississippi River discharge control water salinity and fish behavior, so tide tables and seasonal timing matter more than most inland Louisiana lakes.
  • Louisiana saltwater fishing licenses are required for anyone 16 and older, and redfish have a daily bag limit of three fish per person with a 18-inch minimum length.
  • Summer and early fall typically offer the clearest water and most consistent redfish activity, while spring can be productive but with higher turbidity from river discharge.

Seasons and water conditions at Flat Lake

Summer and early fall — June through October — are the most popular times to fish Flat Lake. Water clarity is generally best during this period, especially in late August and September when river discharge is lower and tidal influence is stronger. Redfish are active in shallow water, and seatrout congregate around deeper holes and channel edges. Water temperature ranges from the mid-80s in July and August to the low 70s by October, which keeps fish feeding steadily.

Spring (March through May) can be productive but comes with higher water turbidity from increased Mississippi River flow. Redfish are still present and hungry as they move into shallower water to spawn, but sight-fishing becomes harder. Flounder move into the lake during this transition, and black drum become more active. Fall (November through December) remains good, though water temperature drops and some fish move to deeper channels. Winter fishing is possible but less predictable — water temperatures in the 50s slow feeding, and rough conditions often make the lake unfishable.

How to reach Flat Lake and where to launch

Flat Lake is accessed by boat only; there is no bank fishing. The nearest public boat launch is at Venice Marina, located in Venice, Louisiana, about 35 miles south of New Orleans via Highway 23. The marina has multiple launch ramps, fuel, and tackle shops. From Venice, Flat Lake is roughly 15 to 20 minutes by boat depending on which part of the lake you target.

Another option is the Buras boat launch, located further south in Plaquemines Parish. This launch is closer to some sections of Flat Lake and serves as a good alternative if Venice is crowded. Both launches charge a small fee (typically $5 to $10 per vehicle) and operate year-round. Fuel and supplies are available at Venice Marina; Buras has fewer services, so plan accordingly. The run from either launch is through open water and marked channels, so a GPS or chart plotter is essential, especially in low-visibility conditions.

Fish species and what to target

Redfish (red drum) are the primary draw at Flat Lake. They hunt in 1 to 3 feet of water, particularly along marsh edges, oyster reefs, and shallow flats. Sight-fishing for tailing redfish — where their tail breaks the surface as they feed on the bottom — is possible during calm, clear-water periods. Redfish are most active on incoming tides and during low-light periods (early morning and late afternoon). They respond to live mullet, live shrimp, and artificial lures including topwater plugs and soft plastics.

Spotted seatrout are abundant and often easier to catch than redfish. They school in deeper holes, along channel edges, and near submerged structure. Seatrout feed throughout the day but are most active during the first two hours after sunrise and the last two hours before sunset. Live shrimp under a popping cork is a standard approach; soft plastics and small spoons also work. Flounder appear seasonally, particularly in spring and early summer, and are found in deeper channels and around structure. Black drum are present year-round but most active in spring and fall.

Regulations and licensing requirements

Anyone 16 years old or older must have a Louisiana saltwater fishing license to fish Flat Lake. Licenses are available online through the Louisiana Department of Wildlife and Fisheries (LDWF) website, at tackle shops, and at most boat launches. A three-day license costs less than a full-year license and is a good option for short trips. Non-residents and residents pay different rates; check the LDWF website for current pricing.

Redfish have a daily bag limit of three fish per person with an 18-inch minimum length. Spotted seatrout have a 10-fish daily limit with a 12-inch minimum. Flounder have a 10-fish daily limit with a 12-inch minimum. Black drum have a 5-fish daily limit with a 12-inch minimum. Possession limits apply — you cannot exceed the daily bag limit even if you are keeping fish for multiple days. Regulations can change, so check the LDWF website or your fishing license packet for the most current rules before you go.

Tackle and techniques for Flat Lake

For redfish, a 7 to 8-foot medium-power spinning rod with 15 to 20-pound braided line is standard. Braided line casts farther and sinks slower than monofilament, which helps when sight-fishing in shallow water. Live mullet (4 to 6 inches) and live shrimp are the most reliable baits; rig them on a 1/0 to 2/0 circle hook with a 12-inch monofilament leader to reduce line visibility. Artificial lures include topwater plugs (Skitter Walk, Spook), soft plastics (Berkley PowerBait, Gulp), and spoons.

For seatrout, a 6 to 7-foot medium spinning rod with 12 to 15-pound line is adequate. A popping cork rigged 18 to 24 inches above a live shrimp is the most effective setup — the cork creates noise and commotion that attracts seatrout from a distance. Soft plastics on a 1/8 to 1/4-ounce jighead also work well. Flounder are best targeted with live mullet or soft plastics dragged slowly along the bottom in deeper channels. Bring polarized sunglasses for sight-fishing redfish; they reduce water glare and let you spot fish in shallow water.

Tides, weather, and timing your trip

Tidal movement is critical at Flat Lake because the lake is connected to the Gulf of Mexico and influenced by tidal cycles. Incoming tides generally produce better fishing because they push water and food into shallow flats, triggering feeding activity. Outgoing tides can be productive too, especially around channel edges where fish concentrate. Tide tables for the Venice area are a good reference; the NOAA website provides free tide predictions for nearby stations.

Wind and water clarity also matter. Calm conditions with light winds produce the clearest water, which is ideal for sight-fishing redfish. Strong winds stir up sediment and make sight-fishing nearly impossible, but they can trigger aggressive feeding in seatrout and flounder. Overcast days often produce better fishing than bright, sunny days because fish are less wary in lower light. Plan your trip around a favorable tide window (typically 2 to 3 hours around the peak of an incoming tide) and check the forecast for wind and cloud cover.

Frequently Asked Questions

Do I need a guide to fish Flat Lake?

No, but a guide is helpful if you are unfamiliar with the area or want to improve your sight-fishing skills. Guides know the best flats, current conditions, and how to read water. Many operate out of Venice Marina and can be booked through the marina or online. If you go on your own, bring a GPS or chart plotter and study the area on a map beforehand.

What is the best time of day to fish Flat Lake?

Early morning (sunrise to 9 a.m.) and late afternoon (4 p.m. to sunset) are most productive because light levels are lower and fish feed more actively. Midday fishing is possible but slower, especially on bright, calm days. Tidal timing matters more than time of day — a favorable tide at midday often outproduces a poor tide at dawn.

Can I fish Flat Lake in winter?

Yes, but conditions are less predictable. Water temperatures drop into the 50s, which slows fish metabolism and reduces feeding activity. Rough weather and wind are more common, making the lake unsafe for small boats. If you fish in winter, target deeper channels where fish concentrate and use slower presentations with live bait.

What should I bring besides fishing gear?

Bring plenty of water, sunscreen, and a hat — the lake offers no shade. A first-aid kit, a working radio or cell phone, and a fire extinguisher are essential safety items. Bring a cooler with ice to keep fish fresh. Insect repellent helps with mosquitoes, especially in summer and fall. Check the weather forecast and bring rain gear if storms are possible.

Are there lodging and food options near Flat Lake?

Venice has a few small motels and restaurants, though options are limited. Buras has minimal services. Most anglers stay in New Orleans (40 miles north) or book a fishing lodge in Plaquemines Parish. Plan ahead and book lodging in advance, especially during peak season (summer and early fall).