What the Swan River offers and when to fish it

The Swan River is a tidal estuary that runs through Brookhaven on Long Island's North Shore, flowing into Peconic Bay. It's a shallow system—most of it runs 4 to 8 feet deep—that holds striped bass, flounder, and weakfish depending on the season. The river works best from April through October, with spring and fall producing the most consistent action. Summer can be productive early and late in the day, but the shallows warm up by midday and fish move deeper or out toward the bay.

Access is limited but real. You can launch a small boat or kayak at the Brookhaven Town boat launch on Grassy Spine Road, which puts you within a short paddle of the river's lower reaches. Wading is possible in spots, but the bottom is soft mud in most places and the banks are marshy—a kayak or small skiff gives you far more water to cover and keeps you out of trouble.

The Swan is not a destination river the way some others are, but it's a solid local option if you live in or near Brookhaven and want to fish without a long drive. The fishing is straightforward: work the channel edges where deeper water meets the shallows, fish the slack water around the bends, and pay attention to tide. A rising tide pushes fish into the shallows to feed; a falling tide concentrates them in the deeper holes.

Key Takeaways

  • The Swan River holds striped bass and flounder year-round, with spring and fall offering the most reliable fishing from April through October.
  • Launch at the Brookhaven Town boat ramp on Grassy Spine Road; a kayak or small skiff works better than wading because of soft bottom and marshy banks.
  • Fish the channel edges and deeper holes on a falling tide, and work the shallows on a rising tide when stripers move in to feed.
  • The river is shallow—4 to 8 feet in most spots—so use light tackle and stay alert to tidal movement, which changes the water level noticeably.

Seasonal patterns and what to target

Spring (April and May) brings the first strong striped bass run. Fish move into the estuary from the ocean as water temperatures climb into the 50s and 60s. Work the channel edges with live bunker or eels, or throw small plugs and soft plastics along the deeper bends. The bite is often best on the incoming tide when water pushes through the narrow sections and concentrates baitfish.

Summer (June through August) can be hit or miss. Early morning and late evening produce stripers before the shallows warm. Flounder move in during this period and hold on the softer bottom in 6 to 8 feet of water. Fish live spot or squid on the bottom during slack water or the last hour of the falling tide. Midday fishing is slow unless you're targeting flounder in the deepest holes.

Fall (September and October) is when the Swan River fishes best. Stripers return in force as water cools, and they're aggressive. Weakfish also show up in good numbers. Throw small plugs, work soft plastics along the edges, or fish live bait on the incoming tide. The bite can last all day, though dawn and dusk are still most reliable.

Winter (November through March) slows dramatically. Some stripers stay in the deeper holes, but they're sluggish and scattered. If you fish this season, focus on the deepest sections and fish slowly with live eels or bunker. Most anglers skip the Swan in winter and fish the open bays or ocean instead.

Tides, current, and how to read the water

The Swan River is tidal, and tide controls everything. A rising tide pushes water into the estuary and spreads fish across the shallows to hunt. A falling tide concentrates fish in the deeper channel and the holes where water pools before draining back out. Plan your fishing around these movements: arrive on the rising tide if you want to cover shallow water, or time your trip for the last two hours of the falling tide if you want to fish the deeper holes where stripers stack up.

The river narrows in places, which creates current. Where the channel pinches, water moves faster and baitfish get pushed into predictable spots. Fish hold just downstream of these narrows, waiting for food to wash past. If you're in a kayak, use the current to your advantage—drift with it and cast ahead, letting the current carry your lure or bait into the strike zone.

Slack water—the brief period when tide stops moving between incoming and outgoing—can be productive, but it's also when fish often stop feeding. The bite often picks up 30 to 45 minutes after slack water ends, when current starts moving again and baitfish become active.

Tackle and technique for the Swan

Keep your setup light. A 6 to 7-foot medium-light spinning rod with 10 to 15-pound braid works for stripers and flounder both. The shallow water and soft bottom mean you don't need heavy gear, and lighter tackle lets you feel the bottom and detect bites more easily. Tie a 12 to 15-pound fluorocarbon leader to your braid—the estuary water is relatively clear, and fluorocarbon is less visible than braid.

For stripers, throw small plugs (2 to 3 inches), soft plastics rigged on 1/4 to 3/8-ounce jigs, or work live bunker or eels on a simple rig with a small split shot and a 2/0 to 3/0 hook. Cast along the channel edges and let the current or your retrieve work the lure. Stripers in the Swan are not huge—most run 18 to 26 inches—but they're aggressive and willing.

For flounder, fish live spot or squid on the bottom with a small sinker. Use a basic two-hook rig or a single 2/0 to 3/0 hook. Cast uptide and let the bait settle on the bottom, then work it slowly with small lifts of the rod. Flounder bite softly sometimes, so keep your line relatively tight and watch for the slightest tap.

Access and launch information

The Brookhaven Town boat launch on Grassy Spine Road is your main option. It's a concrete ramp with parking for trailers and cars. There is a launch fee, which varies by year—check with Brookhaven Parks and Recreation before you go. The ramp can get crowded on weekends, especially in spring and fall, so arrive early if you're towing a trailer.

From the ramp, the Swan River is a short paddle or motor north. The lower river—the section closest to Peconic Bay—is the most productive and the easiest to reach. As you move upriver, the water gets shallower and narrower, which can be good for kayaks but limits where a small boat can go safely.

Parking at the ramp is limited, so plan accordingly. If the lot is full, you may need to come back another time or find street parking nearby and walk in. There are no other public launches directly on the Swan, so Grassy Spine Road is your only realistic option.

What to watch for and common mistakes

The soft mud bottom can trap a kayak or small boat if you're not careful. Avoid anchoring in the shallows unless you're confident you can get free. If you do get stuck, don't panic—the tide will float you off eventually, but it can take hours. Use a pole or paddle to push yourself into deeper water instead of trying to motor out.

Mosquitoes can be brutal in summer, especially in the marshes. Bring insect repellent and wear long sleeves if you're fishing at dawn or dusk. The marsh also means there's not much shade, so bring sunscreen and a hat.

The Swan is a working estuary with some residential and commercial activity. Respect private property, stay in the channel, and don't trespass on the banks. Fishing pressure is light compared to other North Shore systems, so the fish are not heavily educated—but they're also not abundant. Don't expect to catch dozens of fish in a day. A few solid stripers or a couple of flounder is a good outing.

Nearby water and alternatives

If the Swan is slow or you want more options, the Peconic Bay system is close by. The bay holds similar species and offers more open water and deeper holes. Carmans River, also in Brookhaven, is another shallow estuary worth exploring if you want variety. Both systems fish best on similar tides and seasons as the Swan.

For ocean access, the Brookhaven beaches and inlets are within 20 minutes of the Swan. If you want to target larger stripers or different species, the open water often produces better than the estuary, especially in summer and winter.

Frequently Asked Questions

Can I fish the Swan River from shore?

Wading is possible in a few spots, but the banks are mostly marshy and the bottom is soft mud. A kayak or small boat gives you access to far more water and keeps you out of the muck. If you do wade, wear waders and stay in the channel edges where the bottom is firmer.

What's the best tide for the Swan?

A rising tide spreads fish across the shallows and is good for covering water. The last two hours of a falling tide concentrates fish in the deeper holes and can produce excellent fishing. Both work—it depends whether you want to fish shallow or deep.

Do I need a boat to fish here?

A kayak is enough. You can launch at Grassy Spine Road and paddle into the river in 10 minutes. A small motorboat works too, but the shallow water and narrow sections mean a kayak is often more practical and gives you access to spots a boat can't reach.

What size fish should I expect?

Stripers in the Swan typically run 18 to 26 inches. Flounder average 14 to 18 inches. Larger fish move through the estuary, but they're not common. The Swan is a numbers fishery for smaller fish, not a trophy destination.

Is there a season when the Swan is closed?

No seasonal closure applies to the Swan River itself, but New York state striped bass regulations change by season. Check the current New York Department of Environmental Conservation regulations before you fish to confirm size and bag limits for the time of year you're planning to go.