What You'll Find at Alison Island

Alison Island sits in the middle reach of the Caloosahatchee River near LaBelle, Florida, roughly 90 miles upstream from the Gulf. It's a small, mangrove-fringed island that breaks the river's current and creates productive shallow flats on both sides — the kind of structure that holds fish year-round. The island itself is undeveloped and remains a natural area, making it a quiet alternative to the more crowded sections of the river downstream.

The water around Alison Island ranges from 2 to 8 feet deep depending on tide and recent rainfall. Tarpon, snook, and largemouth bass use the shallows during spring and fall. Redfish and permit work the edges during summer. In winter, when the river cools, you'll find schooling tarpon in the deeper channels nearby, though they're less active than in warmer months. The island's position means you get both river current and tidal influence, which concentrates baitfish and predators.

Key Takeaways

  • Alison Island is accessible by boat from public ramps near LaBelle, about a 20-minute run upriver from the closest launch.
  • Spring (March through May) and fall (September through November) are the most productive seasons for tarpon, snook, and redfish.
  • You must follow Florida saltwater fishing regulations, including species-specific bag limits and size restrictions that vary by fish type.
  • The island's shallow flats require a shallow-draft boat or kayak; deep-V hulls and large center consoles will struggle in low water.
  • Tidal movement is critical — fish feed most actively during the incoming tide and the first two hours of the outgoing tide.

How to Reach Alison Island

The closest public boat ramp is at Ortona Lock and Dam, located on State Road 78 west of LaBelle. The ramp is free and has parking, though it fills on weekends. From Ortona, head upriver (south) for about 20 minutes at idle speed — the river narrows and shallows as you go, so watch your depth. Alison Island appears on the right bank as you approach; you'll see the mangroves and the island's distinctive shape.

An alternative is the ramp at Caloosahatchee Park in LaBelle itself, which is slightly closer but smaller and more crowded. Both ramps require a Florida Boating Safety ID card if you were born after June 1, 1988 — you can get this online through the Florida Fish and Wildlife Conservation Commission (FWC) website or at most bait shops.

If you don't own a boat, several charter captains work the Caloosahatchee and will take you to Alison Island or nearby flats. They know the tides and the fish movements and can save you time learning the area. Expect to pay $400 to $600 for a half-day trip for two people.

Best Seasons and What Species You'll Encounter

Spring (March through May) is the strongest season. Tarpon move upriver to spawn, and you'll see them rolling in the deeper channels near the island. Snook are aggressive in the shallows as water warms. Redfish cruise the flats hunting mullet and shrimp. Water temperature ranges from 70 to 80 degrees Fahrenheit, and the longer daylight hours mean you can fish longer without rushing.

Fall (September through November) is nearly as good. Tarpon return to the river after summer, and the water cools from 85 degrees down to 75. Snook and redfish are still active. Permit sometimes show up in October and November, though they're less reliable than the other species. Baitfish are abundant, which means predators feed more predictably.

Summer (June through August) is slower. Water temperatures climb above 85 degrees, and fish move to deeper channels or hold tight in the mangroves during the heat of the day. Early morning and late evening are your best windows. Redfish and permit are more likely than tarpon or snook during these months.

Winter (December through February) is the slowest season. Tarpon school in the deep holes but are sluggish and don't feed as readily. Snook retreat to deeper water and mangrove roots. Largemouth bass become more active as freshwater inflow increases, but saltwater species are not a reliable target. Many anglers skip the Caloosahatchee in winter and fish the coastal estuaries instead.

Regulations and What You Need to Know Before You Fish

Florida requires a saltwater fishing license for anyone 16 and older, unless you hold a valid Florida hunting and fishing license or are a Florida resident fishing from your own property. You can buy a 3-day, 7-day, or annual license online through the FWC website or at bait shops. The cost varies; a 7-day license runs roughly $17 for residents and $32 for non-residents, though prices change annually.

Species-specific rules matter at Alison Island. Tarpon have no bag limit but must be 77 inches or longer (fork length). Snook have a 1-fish bag limit and must be between 28 and 34 inches. Redfish have a 1-fish bag limit and must be between 18 and 27 inches. Permit have a 1-fish bag limit and must be 24 inches or longer. Largemouth bass follow freshwater rules: 5-fish bag limit, 12 inches minimum. These regulations change periodically, so check the FWC website or call their hotline before you go.

The Caloosahatchee is part of the Florida saltwater system, so you follow saltwater rules even though the water is brackish. Catch-and-release is legal for all species, and many anglers practice it for tarpon and permit because the fight is the point.

Boat Type and Gear Considerations

A shallow-draft boat is essential. Flats skiffs, kayaks, and small jon boats work well. The water around Alison Island is often 2 to 4 feet deep, and at low tide it can drop to 1.5 feet. A 20-foot center console or larger deep-V hull will run aground and leave you stuck. If you're renting, ask the rental shop for a skiff or flats boat, not a cruiser.

Poling or paddling is often more effective than running the engine. Fish spook easily in shallow water, and the sound of a motor carries far. Bring a push pole or paddle and work the flats quietly. A trolling motor can help you position without spooking fish, but it's not essential.

For tackle, bring medium spinning rods (6.5 to 7 feet) with 15- to 20-pound braid. Tarpon and snook require heavier gear — 20- to 30-pound braid and a 7-foot rod — because they run hard and have tough mouths. Live mullet, live shrimp, and live pinfish are the most reliable baits. Artificial lures (topwater plugs, soft plastics, and swimbaits) work well for snook and redfish but are less effective for tarpon.

Tides, Weather, and Timing

Tides control fishing success on the Caloosahatchee more than almost any other factor. Fish feed most actively during the incoming tide and the first two hours of the outgoing tide. Slack tide (the brief pause between incoming and outgoing) is usually slow. Check tide tables for the LaBelle area before you leave — the NOAA website has free predictions for the Caloosahatchee.

Wind matters too. A light wind (under 10 knots) from the east or northeast is ideal because it pushes water into the shallows and concentrates baitfish. Strong wind from the west or southwest makes the shallows choppy and pushes water out, which scatters fish. Avoid fishing during or immediately after heavy rain, because freshwater runoff muddies the water and fish stop feeding.

Sunrise and sunset are productive, but midday fishing is possible if you focus on deeper channels and mangrove edges where fish have shade. In summer, fish the early morning (before 9 a.m.) and late evening (after 5 p.m.) to avoid the heat.

What Makes Alison Island Different from Other Caloosahatchee Spots

Alison Island is quieter and less crowded than the lower Caloosahatchee near Sanibel and Captiva. It's also more consistent for tarpon and snook because the island creates a natural funnel that concentrates fish. The downside is that it requires a longer boat run from the nearest ramp, so you lose fishing time getting there and back.

The upper Caloosahatchee (above Alison Island, toward Lake Okeechobee) is fresher and holds more largemouth bass and catfish. The lower Caloosahatchee (below Ortona, toward the Gulf) is saltier and more crowded with charter boats. Alison Island sits in the middle, where you get a mix of both worlds — enough salt for tarpon and snook, enough structure for bass, and fewer boats than downstream.

Frequently Asked Questions

Can I fish Alison Island from shore or do I need a boat?

You need a boat. The island itself is undeveloped and has no public access or docks. You fish the flats around the island from your boat, anchored or drifting. There are no nearby shore-access points that reach the productive water.

What's the best time of day to fish Alison Island?

Early morning (sunrise to 9 a.m.) and late evening (4 p.m. to sunset) are most productive. Midday is slower, especially in summer. Combine time of day with tide — incoming tide during early morning or late evening is ideal.

Do I need a guide to fish Alison Island successfully?

No, but a guide saves time if you're unfamiliar with the river. The island is easy to find, and the flats are straightforward to fish. A guide is most valuable if you want to target tarpon specifically, because they require knowledge of where tarpon school and how to present baits to them.

Is Alison Island good for beginners?

It's moderately difficult. The shallow water and tidal influence require boat-handling skill, and the fish are strong and fast. Beginners should consider hiring a guide for the first trip or fishing with someone experienced. The Caloosahatchee has easier sections downstream that are better for learning.

What should I do if I hook a tarpon?

Keep your rod tip up and let the fish run — tarpon have soft mouths and will throw the hook if you horse them. Use a steady, firm pressure rather than jerking. If the tarpon jumps, lower your rod tip slightly to keep tension. Tarpon fights can last 30 minutes or longer, so be patient and keep your drag set correctly.