What You'll Find on the Thames River

The Thames River runs 41 miles from the Quinebaug and Shetucket river confluence near the town of Taftville south to Long Island Sound at New London. It's a tidal estuary for roughly the last 10 miles, which means the water shifts between fresh and brackish depending on tide and season. Striped bass, largemouth bass, white perch, and catfish live in the lower sections; smallmouth bass, largemouth bass, and panfish occupy the upper freshwater reaches. The river is accessible from multiple public boat launches and shoreline access points, making it manageable for both kayak anglers and those with larger boats.

The Thames is not a destination river in the way some New England waters are—it doesn't draw anglers from three states away. But it's a working river with steady fishing, reasonable regulations, and enough variety that you can target different species depending on the season and your skill level. The lower tidal section near New London holds the most consistent striped bass fishing; the middle reaches around Norwich and Preston hold a mix of bass and panfish; the upper river near Taftville is quieter and better for smallmouth and largemouth bass in spring and fall.

Key Takeaways

  • The Thames River has three distinct sections—upper freshwater, middle mixed, and lower tidal—each with different species and seasonal patterns.
  • Striped bass fishing peaks in spring and fall in the lower tidal section, particularly around structure like pilings and rocky points.
  • Public boat launches exist at New London, Norwich, and Preston, with additional shoreline access from town parks and boat ramps.
  • Connecticut fishing regulations require a saltwater license for striped bass in the tidal section and a freshwater license for bass and panfish in the upper river.
  • Water quality and tidal flow vary significantly; checking tide tables and recent rain is essential before planning a trip.

Striped Bass in the Lower Tidal Section

The lower Thames from New London upstream to the Uncasville Dam holds the river's most reliable striped bass population. Striped bass move into the estuary in spring (April through May) and again in fall (September through October), following shad and herring runs. During these windows, fish hold near structure: the old pilings of the historic railroad bridge near New London, rocky points at Gales Ferry, and the deeper holes just downstream of the Uncasville Dam.

Spring fishing is typically better than fall because the water is cooler and fish are more aggressive after spawning. Fish 2 to 3 hours before and after high tide, when current pushes baitfish into predictable zones. Live herring or shad work best if you can source them locally; otherwise, large soft plastics (4 to 6 inches) in natural colors fished on a 1/2-ounce jig head will take fish. The minimum size for striped bass in Connecticut is 18 inches, and the daily limit is one fish per angler.

Largemouth and Smallmouth Bass in the Upper River

Above the Uncasville Dam, the Thames becomes a freshwater river with a different character. Largemouth bass dominate the slower, weedier sections near Preston and Griswold; smallmouth bass prefer the rocky areas and current breaks closer to Taftville. Both species bite well in spring (April through May) and fall (September through October), with a secondary bite in early summer before the water gets too warm.

Largemouth bass respond to topwater plugs and soft plastics worked around submerged timber and weed edges. Smallmouth bass prefer crankbaits and tube jigs fished near rocks and drop-offs. The upper river is narrower and shallower than the lower section, so a kayak or small boat is often more effective than a larger vessel. Water levels fluctuate based on dam releases from upstream, so check the Quinebaug River flow data before planning a trip—high water can make fishing difficult, while moderate flows concentrate fish in predictable holding areas.

Public Access Points and Boat Launches

The Thames has three main public boat launches: the New London Waterfront Park launch (near the mouth, suitable for larger boats and trailers), the Norwich Harbor launch (mid-river, good for kayaks and small boats), and the Preston City Park launch (upper river, primarily for kayaks and small boats). All three are free and open to the public during daylight hours. The New London and Norwich launches have parking; the Preston launch has limited parking and is best for kayak anglers.

Shoreline access is available from several town parks, though most require parking fees or town resident permits. Gales Ferry has informal access near the old bridge pilings. The Uncasville Dam area has a small parking area and walking access to the dam pool, which is productive for striped bass in spring. Check with the town clerk's office in Preston, Norwich, or New London if you're unsure about parking or access restrictions at a specific location.

Seasons and Water Conditions

Spring (April through May) is the most consistent season on the Thames. Water temperatures rise from the 40s to the 60s, triggering spawning runs of shad and herring that bring striped bass and larger largemouth bass into the estuary and lower river. Smallmouth bass and panfish also become active in the upper river during this window. Water levels are typically moderate, and tidal flow is predictable.

Summer (June through August) is slower. Water temperatures exceed 70 degrees, and fish move to deeper, cooler sections or become less active during the day. Early morning and evening fishing can work, but midday is often unproductive. Fall (September through October) mirrors spring: water cools, fish feed aggressively, and both striped bass and freshwater bass bite well. Winter (November through March) is difficult; striped bass leave the estuary, and freshwater bass are sluggish in cold water. A few dedicated anglers fish for catfish in winter, but most people avoid the river during this season.

Regulations and Licensing

Connecticut requires a saltwater fishing license for anyone targeting striped bass in the tidal section of the Thames (roughly from New London to the Uncasville Dam). A freshwater license is required for largemouth bass, smallmouth bass, and panfish in the upper river. Licenses are available online through the Connecticut Department of Energy and Environmental Protection (DEEP) or at most tackle shops and sporting goods stores.

Striped bass have a minimum size of 18 inches and a daily limit of one fish per angler. Largemouth bass have a minimum size of 12 inches with a daily limit of six fish. Smallmouth bass have a minimum size of 10 inches with a daily limit of six fish. Panfish (bluegill, crappie, sunfish) have no minimum size and a daily limit of 25 fish in aggregate. Check the current DEEP fishing regulations before you go, as rules can change year to year.

What Makes the Thames Different from Other Connecticut Rivers

The Thames is shorter and more urban than the Housatonic or Connecticut rivers, which means it's less crowded but also more affected by water quality issues and dam operations. The Uncasville Dam creates a distinct boundary between the tidal estuary and the freshwater upper river, so you're essentially fishing two different systems depending on where you launch. The lower river is more productive for striped bass; the upper river is better for a quieter, more traditional bass-fishing experience.

The Thames also has a strong commercial and recreational boating presence, especially near New London and Norwich. Weekday fishing is often quieter than weekends. The river's proximity to the coast means saltwater species occasionally move in during warm years, but this is not reliable enough to plan a trip around. For most anglers, the Thames is a solid local option rather than a destination worth traveling for, but it rewards regular visits and familiarity with its tidal patterns and seasonal rhythms.

Frequently Asked Questions

Do I need both a freshwater and saltwater license to fish the Thames?

Only if you fish both sections. If you stay in the tidal section targeting striped bass, a saltwater license is sufficient. If you fish only the upper freshwater river for bass and panfish, a freshwater license is all you need. Many anglers buy both to keep their options open.

What's the best time to fish for striped bass on the Thames?

Spring (April through May) is most consistent. Fish 2 to 3 hours before and after high tide near structure like pilings and rocky points. Fall (September through October) can be good but is less predictable. Summer and winter are difficult.

Can I kayak the Thames, or do I need a motorboat?

Kayaks work well, especially in the upper river and middle sections. The lower tidal section near New London can have strong currents and commercial boat traffic, so a kayak is possible but requires caution. The Preston and Norwich launches are better suited to kayak access than the New London launch.

What should I do if water levels are high after heavy rain?

High water from upstream dam releases or heavy rain makes fishing difficult because fish scatter and visibility drops. Wait 2 to 3 days for levels to stabilize before planning a trip. Check the Quinebaug River flow data online before you go.

Are there catfish in the Thames?

Yes, channel catfish and flathead catfish live in the lower and middle sections. They're most active in summer and early fall. Fish cut bait or chicken liver near deeper holes and structure at night or early morning for best results.