What You'll Find at Deer Isle Causeway

The Deer Isle Causeway connects the mainland to Deer Isle via a half-mile bridge that crosses Eggemoggin Reach, one of Maine's most productive saltwater passages. The causeway itself is not a fishing destination — you cannot stop or fish from it — but the waters immediately around it hold striped bass, mackerel, and seasonal runs of bluefish that draw anglers to the nearby access points and boat launches on both sides of the bridge.

The real fishing happens in Eggemoggin Reach, the tidal channel the causeway spans. This is a working waterway with strong currents, narrow passages between islands, and the kind of structure — ledges, rocky points, and drop-offs — that concentrates fish. The causeway itself creates a bottleneck that funnels baitfish and predators through a predictable zone, making it a reliable spot during the right tides and seasons.

Key Takeaways

  • Fish the waters around the causeway during slack tide or the first two hours of current change, when striped bass and mackerel are most active.
  • Access is from the Deer Isle side at the causeway parking area or from the mainland side near Little Deer Isle — both have small pull-offs but no formal boat launch.
  • Striped bass run heaviest from May through October, with mackerel and bluefish arriving in summer and early fall.
  • Eggemoggin Reach is tidal water with currents that can exceed three knots, so plan your fishing around tide tables and use a boat or wade only in designated shallow areas.
  • A Maine saltwater fishing license is required for all anglers 16 and older, and striped bass have specific size and bag limits that change annually.

Seasons and What Fish Are Present

Striped bass are the primary target at the causeway, with the season running from May through October. Spring (May and early June) brings the first wave of fish moving through Eggemoggin Reach on their way to summer feeding grounds. Fall (September and October) often produces the largest fish and the most consistent action as bass stage before heading offshore for winter.

Mackerel arrive in June and stay through September, feeding on the baitfish that concentrate in the reach. Bluefish show up in July and August, particularly during strong tides when they hunt in the current. Pollock and cod are present year-round in deeper water but are less predictable from shore or small boats near the causeway.

Winter fishing is possible but limited. The reach does not freeze solid, but water temperatures drop into the 30s, and most recreational anglers do not fish this area in December through March. If you do fish winter, expect slower action and fewer fish.

How to Fish the Causeway Area

The causeway itself is off-limits, but you can fish from a boat in the waters on either side. Anchor or drift in the deeper channels, casting toward the rocky points and ledges that line the reach. Live mackerel or herring work well for striped bass; small metal jigs and plugs draw strikes from mackerel and bluefish. The current is strong enough that you will need to adjust your drift or anchor position frequently as the tide changes.

Shore fishing is limited. The causeway has a small parking area on the Deer Isle side, but there is no formal shore access directly from the bridge. Some anglers wade in the shallower areas near the parking area during low tide, but this is not a productive method compared to boat fishing. The best shore option is to launch a kayak or small boat from one of the nearby ramps and fish the deeper water beyond the shallows.

Timing around the tide is critical. Fish are most active during slack tide (the brief period when current stops) and the first two hours after the current begins to change. Fishing during peak current (when the water is moving fastest) is difficult because your bait or lure will be swept away too quickly. Check tide tables for Eggemoggin Reach before you go.

Access and Parking

The Deer Isle Causeway has a small parking area on the Deer Isle side, just after you cross the bridge heading toward the island. This lot is free and holds roughly a dozen vehicles. There is no formal boat launch here, but some anglers with small boats or kayaks use the area to access the water. The mainland side (Little Deer Isle) has a similar small pull-off, though it is less developed.

For a proper boat launch, you will need to drive to one of the nearby towns. Stonington, about 20 minutes south of the causeway on Deer Isle, has a public boat launch with parking and facilities. Brooksville, on the mainland side of Eggemoggin Reach, also has a launch. Both are better options if you are bringing a larger boat or need amenities like restrooms or fuel.

The causeway itself is a Maine Department of Transportation bridge. There are no services — no restrooms, no water, no bait shops — at the parking areas. Bring everything you need, including water and snacks.

Regulations and Licenses

All anglers 16 and older must have a Maine saltwater fishing license to fish in Eggemoggin Reach. You can buy a license online through the Maine Department of Inland Fisheries and Wildlife website, at sporting goods stores, or at some bait shops in nearby towns. A three-day license is available if you are visiting, or you can buy an annual license if you plan to fish Maine waters regularly.

Striped bass have specific size and bag limits that are set annually by the state. As of recent years, the minimum size is 18 inches, and the daily bag limit is one fish per angler. These rules change, so check the current regulations on the Maine Department of Inland Fisheries and Wildlife website before you fish. Mackerel and bluefish have different limits; mackerel typically have no size limit and a generous daily bag, while bluefish have a 12-inch minimum and a five-fish daily limit.

The causeway is a public bridge, but fishing from it is not permitted. Respect private property on both sides of the reach, and do not trespass on island land without permission.

Best Times to Fish

Early morning and late afternoon are traditionally productive, but at the causeway, tide timing matters more than time of day. Fish during the slack tide window — roughly 30 minutes before and after the current stops — and the first two hours of the incoming or outgoing tide. Consult a tide table for Eggemoggin Reach to pinpoint these windows for your fishing day.

Spring tides (when the difference between high and low tide is greatest) create stronger currents and often more active feeding. Neap tides (smaller tidal range) produce weaker currents and can be slower. If you have flexibility, plan your trip around a spring tide during the peak season (May through October).

What to Bring and How to Prepare

If you are fishing from a boat, bring a GPS or chart to navigate the reach safely. The water is deep in the main channel but shallow in spots, and rocks and ledges are not always marked. A depth finder is helpful. Bring more anchor line than you think you will need — the current is strong, and you may need to reset your anchor multiple times.

For tackle, bring medium-weight spinning rods and reels spooled with 15- to 20-pound braided line. Pack a selection of metal jigs (1 to 3 ounces), plugs, and live bait if you can get it. The water is cold even in summer, so wear layers and bring a rain jacket. Sunscreen and polarized sunglasses help you spot fish and reduce glare off the water.

If you are launching from the causeway parking area, arrive early. The lot is small and fills quickly on weekends during peak season. Bring a cooler with ice if you plan to keep fish.

Nearby Towns and Services

Stonington, the largest town on Deer Isle, is about 20 minutes south of the causeway. It has a public boat launch, restaurants, a grocery store, and a few bait and tackle shops. Brooksville, on the mainland, is closer (about 10 minutes) and also has a launch and basic services. Neither town is large, so if you need supplies, stock up before you arrive or plan to make a quick stop in one of these towns.

Castine, about 30 minutes away on the mainland, is a larger town with more dining and lodging options if you are planning an overnight trip. The causeway is a day-trip destination for most anglers, but the surrounding area has enough to support a longer stay if you want to explore other fishing spots or simply enjoy the Maine coast.

Frequently Asked Questions

Can I fish from the causeway bridge itself?

No. The causeway is a Maine Department of Transportation bridge, and fishing from it is not permitted. You must fish from a boat in the water around the causeway or from shore at designated access points nearby.

What is the best tide for fishing the causeway?

Slack tide (when the current stops) and the first two hours after the current begins to change are most productive. Avoid fishing during peak current when the water is moving fastest, as your bait or lure will be swept away too quickly. Check a tide table for Eggemoggin Reach to find these windows.

Do I need a boat to fish here?

A boat gives you access to the deeper, more productive water in Eggemoggin Reach. You can wade or fish from shore near the causeway parking area, but this is less effective. A kayak or small skiff is enough to reach good fishing spots.

What size striped bass can I keep?

The minimum size is 18 inches, and the daily bag limit is one fish per angler as of recent regulations. These rules change annually, so check the Maine Department of Inland Fisheries and Wildlife website before you fish to confirm current limits.

Where is the nearest boat launch?

Stonington, about 20 minutes south on Deer Isle, has a public boat launch with parking and facilities. Brooksville, on the mainland, also has a launch and is closer to the causeway. Both towns have bait shops and basic services.