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4,126-acre Cobscook Bay fishing map with NOAA BlueTopo survey contours (99.45% measured, 99.93% assessed), charted rock and wreck structure, regional fish-survey occurrence, sourced forage timing and verified public access. The water tops out around 149 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. What the data behind the map says about each species, season by season:
Drawn out, this is 4,118 acres of water rimmed by 16 miles of bank — 2 islands included. Index 1.8 on the shoreline: a few honest points and pockets, nothing labyrinthine. 7% of the surface is littoral (under ~15 ft) — cover, weeds and forage water. End to end it runs roughly 4 mi, about 2.8 mi across. Closest neighbour on DepthScout: East Bay, 3 mi northwest of here.
Spring striped bass on Cobscook Bay hold shallow, usually 5 to 20 ft. By summer they slide out to 25 to 60 ft, and by winter most fish are in 20 to 50 ft. The chart's best answer is Shoreline point — point, 7 ft, prime for spring. Prime time lands in early morning and the evening. The summer box starts with a flutter spoon (deep) or an umbrella rig (trolled).
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | Shoreline point (7 ft) | Bucktail jig + trailer, Walking topwater (dawn) |
| Summer | 25 to 60 ft | dawn & dusk | Surveyed channel edge (40 ft) | Flutter spoon (deep), Umbrella rig (trolled) |
| Fall | 10 to 35 ft | dawn & dusk | Shoreline point (7 ft) | Topwater walker, Jerkbait |
| Winter | 20 to 50 ft | midday | Surveyed channel edge (40 ft) | Alabama rig (slow), Flutter spoon |
Spring puts bluefish in skinny water — 3 to 20 ft is the zone. Warm water sends them out to 5 to 30 ft; cold water stacks them in 15 to 40 ft. Feeding flat is the standout, a feeding flat at roughly 21 ft, rated prime for fall bluefish. Plan around early morning and the evening in the warm months. A popper (early/late) or a metal jigs in the rips covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 20 ft | dawn & dusk | Feeding flat (21 ft) | Metal (Hopkins/Kastmaster), Pencil popper |
| Summer | 5 to 30 ft | dawn & dusk | Surveyed channel edge (40 ft) | Popper (early/late), Metal jigs in the rips |
| Fall | 3 to 25 ft | dawn & midday | Feeding flat (21 ft) | Pencil popper, Big metal |
| Winter | 15 to 40 ft | midday | Surveyed channel edge (40 ft) | Metal jig worked slow (southern waters) |
Early season atlantic mackerel use the shallows, holding in 5 to 45 ft. Summer is a 15 to 80 ft game here, winter a 30 to 120 ft one. The chart's best answer is Surveyed channel edge — drop-off, 72 ft, prime for summer. Best bite is early morning and the evening. Tie on a feather rig or a small vertical jig and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 45 ft | dawn & dusk | Shoreline point (7 ft) | Mackerel feather rig, Small silver jig |
| Summer | 15 to 80 ft | dawn & dusk | Surveyed channel edge (72 ft) | Feather rig, Small vertical jig |
| Fall | 10 to 65 ft | dawn & dusk | Surveyed channel edge (40 ft) | Compact silver jig, Sparse feather rig |
| Winter | 30 to 120 ft | midday | Surveyed channel edge (72 ft) | Small deep jig |
Come spring, look for atlantic cod tight to the bank in 20 to 100 ft. They move out to 37 to 149 ft in summer and finish the year down in 34 to 149 ft. If you only fish one area, make it NOAA charted underwater rock: a rock pile around 33 ft that scores prime in spring. Best bite is early morning. A heavy metal jig or a large soft-plastic jig is the honest summer answer here.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 20 to 100 ft | dawn | NOAA charted underwater rock (33 ft) | Diamond jig, Heavy bucktail |
| Summer | 37 to 149 ft | dawn | NOAA charted underwater rock (43 ft) | Heavy metal jig, Large soft-plastic jig |
| Fall | 25 to 140 ft | dawn | NOAA charted underwater rock (33 ft) | Diamond jig, Bucktail with teaser |
| Winter | 34 to 149 ft | midday | NOAA charted underwater rock (33 ft) | Heavy vertical jig |
In spring, atlantic herring run shallow here, mostly 5 to 25 ft. Midsummer fish sit out in 15 to 50 ft before dropping to 20 to 60 ft for winter. Summer atlantic herring concentrate at Surveyed channel edge, a prime-rated drop-off around 40 ft. Fish it in early morning and the evening and you'll meet the bite. You won't need more than a herring feather rig or a small silver jig most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 25 ft | dawn & dusk | NOAA charted underwater rock (13 ft) | Small herring feather rig, Micro jig rig |
| Summer | 15 to 50 ft | dawn & dusk | Surveyed channel edge (40 ft) | Herring feather rig, Small silver jig |
| Fall | 10 to 40 ft | dawn & dusk | Surveyed channel edge (40 ft) | Small feather rig, Compact silver spoon |
| Winter | 20 to 60 ft | midday | Surveyed channel edge (40 ft) | Small silver jig, Sparse feather rig |
Structure-wise the chart holds 24 features, led in depth by Surveyed channel edge at roughly 90 ft.
Access data: Maine GeoLibrary — Boat Launches (Maine IF&W / DACF). Confirm conditions and fees locally before you launch.
Season dates, license requirements, and size and bag limits for Maine waters are set by the Maine DMR (saltwater recreational fishing) — and special regulations can apply to Cobscook Bay specifically, so confirm the current rules before you fish.
Check the official Maine fishing regulations →
Cobscook Bay is about 149 ft (45 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, atlantic mackerel, atlantic cod, atlantic herring on Cobscook Bay.
NOAA charted underwater rock is the top-rated area: a rock pile in about 33 ft of water that rates prime for atlantic cod in spring. The map above holds the full rated-spot list for every species and season.
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 Cobscook Bay is regulated by the Maine DMR (saltwater recreational fishing). Check the official Maine regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
East Bay 3 mi · Harris Cove 4 mi · Johnson Bay 5 mi · Lake Glensevern 8 mi, NB · Boyden Lake 8 mi · Pennamaquan Lake 10 mi · Rocky Lake 12 mi · Round Pond 12 mi · Gardner Lake 15 mi · Little Lake 16 mi, NB · Wilson Pond 16 mi, NB · Eel Lake 16 mi, NB
See how Cobscook Bay stacks up: best striped bass lakes in Maine · best bluefish lakes in Maine · best atlantic herring lakes in Maine · best atlantic mackerel lakes in Maine
Browse all Maine fishing maps or see every water on DepthScout. Bathymetry credit: NOAA BlueTopo (NAVD88; 99% 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.