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177-acre Twotree Island Channel fishing map with NOAA BlueTopo survey contours (99.62% measured, 100% assessed), source-traceable coastal structure, regional fish-survey occurrence, sourced forage timing and verified public access. The water tops out around 85 ft. The depth chart is built from real agency bathymetry referenced to NAVD88; directly measured coverage remains distinguished from source interpolation. The channels, holes and drop-offs come from the source data, not a distance-from-shore model. Below is the species-by-species picture, pulled from the same data the map uses.
The drawn water covers 177 acres wrapped in 2.8 miles of bank. With a 1.5 development index there's bank structure worth casting at, in moderation. 0% of the surface is littoral (under ~15 ft) — cover, weeds and forage water. Call it 1 mi long by 0.4 mi wide at the broadest reach. If the bite dies, Niantic Bay is 3 mi to the northwest.
The spring pattern is a shallow one: striped bass in 5 to 20 ft. As the season builds they drop to 25 to 60 ft, wintering in 20 to 50 ft. Top water on the chart: Surveyed channel edge, a drop-off in the 59 ft range, good in summer. Time it for early morning and the evening. Summer baits: a topwater walker at low light or a paddletail on a light jig gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | open water | 3-6 inch paddletail, Suspending minnow plug |
| Summer | 25 to 60 ft | dawn & dusk | Surveyed channel edge (59 ft) | Topwater walker at low light, Paddletail on a light jig |
| Fall | 10 to 35 ft | dawn & dusk | open water | Pencil popper, Baitfish swimbait |
| Winter | 20 to 50 ft | midday | Surveyed channel edge (49 ft) | Slow paddletail, Bucktail near bottom |
Spring bluefish on Twotree Island Channel hold shallow, usually 3 to 20 ft. By summer they slide out to 5 to 30 ft, and by winter most fish are in 15 to 40 ft. Prime time lands in early morning and the evening. The summer box starts with a popper (early/late) or a metal jigs in the rips.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 20 ft | dawn & dusk | open water | Metal (Hopkins/Kastmaster), Pencil popper |
| Summer | 5 to 30 ft | dawn & dusk | open water | Popper (early/late), Metal jigs in the rips |
| Fall | 3 to 25 ft | dawn & midday | open water | Pencil popper, Big metal |
| Winter | 15 to 40 ft | midday | open water | Metal jig worked slow (southern waters) |
In spring, summer flounder (fluke) run shallow here, mostly 5 to 25 ft. Summer pushes them deeper, 8 to 35 ft, and winter fish settle into 20 to 60 ft. Surveyed channel edge is the standout, a drop-off at roughly 49 ft, rated good for fall summer flounder (fluke). Time it for midday and early morning. You won't need more than a bucktail (1-3 oz by drift speed) or a gulp grub on jighead most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 25 ft | midday & dawn | open water | Bucktail + Gulp swimming mullet, Hi-lo rig + squid strip |
| Summer | 8 to 35 ft | midday & dawn | open water | Bucktail (1-3 oz by drift speed), Gulp grub on jighead |
| Fall | 12 to 45 ft | midday | Surveyed channel edge (49 ft) | Heavier bucktail on the lumps, Big Gulp 6" grub |
| Winter | 20 to 60 ft | midday | Surveyed channel edge (59 ft) | Slow bottom rig + strip |
The spring pattern is a shallow one: black sea bass in 10 to 40 ft. As the season builds they drop to 15 to 60 ft, wintering in 26 to 85 ft. Top water on the chart: Surveyed channel edge, a drop-off in the 59 ft range, good in summer. Time it for midday and early morning. Summer baits: a bucktail + grub or a diamond jig + squid teaser gets it done.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 10 to 40 ft | midday & dawn | open water | Hi-lo rig + squid, 1-2 oz bucktail + Gulp |
| Summer | 15 to 60 ft | midday & dawn | Surveyed channel edge (59 ft) | Bucktail + grub, Diamond jig + squid teaser |
| Fall | 20 to 80 ft | midday | Surveyed channel edge (63 ft) | 3-4 oz vertical jig (deep), Double-teaser rig |
| Winter | 26 to 85 ft chart-limited; documented 40 to 100 ft | midday | open water | Heavy hi-lo rig on deep wrecks |
Come spring, look for tautog (blackfish) tight to the bank in 5 to 25 ft. They move out to 10 to 35 ft in summer and finish the year down in 30 to 70 ft. If you only fish one area, make it Surveyed channel edge: a drop-off around 49 ft that scores good in fall. Best bite is early morning. A 1/2-1 oz tog jig + crab is the honest summer answer here.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 25 ft | midday & dawn | open water | Tog jig + green crab half, Bare jig + clam (early) |
| Summer | 10 to 35 ft | dawn | open water | 1/2-1 oz tog jig + crab |
| Fall | 10 to 50 ft | midday | Surveyed channel edge (49 ft) | Tog jig + whole green crab, Old-school rig + double crab (deep) |
| Winter | 30 to 70 ft | midday | open water | Heavy jig + crab on deep structure |
Start shallow in spring: scup (porgy) sit in 5 to 25 ft that time of year. Summer pushes them deeper, 6 to 35 ft, and winter fish settle into 12 to 50 ft. The spot to know is Surveyed channel edge, a drop-off in about 49 ft of water that rates good for scup (porgy) in winter. Warm-month bites cluster around midday and early morning. Throw a hi-lo porgy rig or a micro metal jig until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 25 ft | dawn | open water | Small hi-lo rig, Micro jig tipped with bait |
| Summer | 6 to 35 ft | midday & dawn | open water | Hi-lo porgy rig, Micro metal jig |
| Fall | 8 to 40 ft | midday | open water | Compact vertical jig, Hi-lo rig |
| Winter | 12 to 50 ft | midday | Surveyed channel edge (49 ft) | Small slow vertical jig |
Twotree Island Channel also holds winter flounder (8 to 30 ft in summer). Pick any of them on the map above for rated spots and bait picks.
4 pieces of structure are mapped here — USGS-mapped Twotree Island sand-wave field, around 77 ft, is the deepest of them.
Access data: Connecticut DEEP — State Boat Launches. Confirm conditions and fees locally before you launch.
Season dates, license requirements, and size and bag limits for Connecticut waters are set by the Connecticut DEEP (marine fishing) — and special regulations can apply to Twotree Island Channel specifically, so confirm the current rules before you fish.
Check the official Connecticut fishing regulations →
Twotree Island Channel is about 85 ft (26 m) deep at its deepest point. The depth chart is built from real agency bathymetry referenced to NAVD88; directly measured coverage remains distinguished from source interpolation. The contours reflect measured and quality-assessed source depths.
Anglers target striped bass, bluefish, summer flounder (fluke), black sea bass, tautog (blackfish), scup (porgy), winter flounder on Twotree Island Channel. The list combines the water's survey records with habitat-filtered species from broader official evidence; those additions are plausible occurrences, not exact-water abundance or guaranteed catches.
Surveyed channel edge is the top-rated area: a drop-off in about 59 ft of water that rates good for striped bass in summer. Every other rated spot, per species and season, is on the map above.
For striped bass, the summer bite is best in early morning and the evening. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Fishing on Twotree Island Channel is regulated by the Connecticut DEEP (marine fishing). Check the official Connecticut regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Niantic Bay 3 mi · Dodge Pond 4 mi · New London Harbor 4 mi · Gorton Pond 5 mi · Thames River 7 mi · Pataganset Lake 7 mi · Powers Lake 9 mi · Fishers Island Sound 9 mi · Rogers Lake 9 mi · Mystic Harbor 9 mi · Norwich Pond 10 mi · Uncas Lake 10 mi
See how Twotree Island Channel stacks up: best striped bass lakes in Connecticut · best summer flounder (fluke) lakes in Connecticut · best winter flounder lakes in Connecticut · best bluefish lakes in Connecticut
Browse all Connecticut fishing maps. See every water on DepthScout. Bathymetry credit: NOAA BlueTopo (NAVD88; 100% measured, 0% source-interpolated). How we build these maps. Fish here with a sonar unit that logs? Send us your depth data and we'll improve this chart, credited to you. For fishing guidance only, never navigation.