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53-acre Gosport Harbor fishing map with NOAA BlueTopo survey contours (100% measured, 100% assessed), source-traceable coastal structure, regional fish-survey occurrence, sourced forage timing and verified public access. The water tops out around 78 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. Here is how the season plays out for each species, straight from the data behind the map.
Gosport Harbor maps at 53 acres behind 1.7 miles of shoreline — one island included. With a 1.6 development index there's bank structure worth casting at, in moderation. Roughly 16% of the water is 15 ft or less, the band where the food chain lives. Call it 0.4 mi long by 0.3 mi wide at the broadest reach. If the bite dies, Little Harbor is 8 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 43 ft range, prime in summer. Time it for early morning and the evening. Summer baits: a flutter spoon (deep) or an umbrella rig (trolled) gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | open water | Bucktail jig + trailer, Walking topwater (dawn) |
| Summer | 25 to 60 ft | dawn & dusk | Surveyed channel edge (43 ft) | Flutter spoon (deep), Umbrella rig (trolled) |
| Fall | 10 to 35 ft | dawn & dusk | Surveyed channel edge (31 ft) | Topwater walker, Jerkbait |
| Winter | 20 to 50 ft | midday | Surveyed channel edge (43 ft) | Alabama rig (slow), Flutter spoon |
Spring bluefish on Gosport Harbor 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. The chart's best answer is Surveyed channel edge — drop-off, 31 ft, prime for summer. 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 | Surveyed channel edge (31 ft) | Popper (early/late), Metal jigs in the rips |
| Fall | 3 to 25 ft | dawn & midday | Surveyed channel edge (31 ft) | Pencil popper, Big metal |
| Winter | 15 to 40 ft | midday | Surveyed channel edge (31 ft) | Metal jig worked slow (southern waters) |
In spring, atlantic mackerel run shallow here, mostly 5 to 45 ft. Summer pushes them deeper, 15 to 78 ft, and winter fish settle into 20 to 78 ft. Surveyed channel edge is the standout, a drop-off at roughly 43 ft, rated prime for summer atlantic mackerel. Time it for early morning and the evening. You won't need more than a feather rig or a small vertical jig most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 45 ft | dawn & dusk | Surveyed channel edge (43 ft) | Mackerel feather rig, Small silver jig |
| Summer | 15 to 78 ft | dawn & dusk | Surveyed channel edge (43 ft) | Feather rig, Small vertical jig |
| Fall | 10 to 65 ft | dawn & dusk | Surveyed channel edge (43 ft) | Compact silver jig, Sparse feather rig |
| Winter | 20 to 78 ft | midday | Surveyed channel edge (43 ft) | Small deep jig |
In spring, atlantic cod run shallow here, mostly 16 to 78 ft. Summer keeps them at 20 to 78 ft, and they winter in 18 to 78 ft. Summer atlantic cod concentrate at NOAA charted rock bottom, a prime-rated hard bottom around 20 ft. Fish it in early morning and you'll meet the bite. You won't need more than a heavy metal jig or a large soft-plastic jig most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 16 to 78 ft | dawn | NOAA charted rock bottom (20 ft) | Diamond jig, Heavy bucktail |
| Summer | 20 to 78 ft | dawn | NOAA charted rock bottom (20 ft) | Heavy metal jig, Large soft-plastic jig |
| Fall | 14 to 78 ft | dawn | NOAA charted rock bottom (20 ft) | Diamond jig, Bucktail with teaser |
| Winter | 18 to 78 ft | midday | NOAA charted rock bottom (20 ft) | Heavy vertical jig |
Early season atlantic herring use the shallows, holding in 5 to 25 ft. Expect a summer slide to 15 to 50 ft, then a winter hold in 20 to 60 ft. Put Surveyed channel edge first on the milk run — a drop-off near 43 ft that grades prime for summer. In summer the feeding windows fall in early morning and the evening. Tie on a herring feather rig or a small silver jig and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 25 ft | dawn & dusk | NOAA charted pier (15 ft) | Small herring feather rig, Micro jig rig |
| Summer | 15 to 50 ft | dawn & dusk | Surveyed channel edge (43 ft) | Herring feather rig, Small silver jig |
| Fall | 10 to 40 ft | dawn & dusk | Surveyed channel edge (31 ft) | Small feather rig, Compact silver spoon |
| Winter | 20 to 60 ft | midday | Surveyed channel edge (43 ft) | Small silver jig, Sparse feather rig |
9 pieces of structure are mapped here — Surveyed channel edge, around 43 ft, is the deepest of them.
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 Gosport Harbor specifically, so confirm the current rules before you fish.
Check the official Maine fishing regulations →
Gosport Harbor is about 78 ft (24 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 Gosport Harbor.
NOAA charted rock bottom is the top-rated area: a hard bottom in about 20 ft of water that rates prime for atlantic cod 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 Gosport Harbor 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.
Little Harbor 8 mi, NH · EEL POND 8 mi, NH · Portsmouth Harbor 8 mi, NH/ME · Piscataqua River 9 mi, NH · Hampton Harbor 12 mi, NH · Cape Neddick Harbor 14 mi · Merrimack River 16 mi, MA/NH · EXETER RESERVOIR 16 mi, NH · Squamscott River 16 mi, NH · Bellamy River 18 mi, NH · Plum Island Sound 20 mi, MA · Upper Artichoke Reservoir 20 mi, MA
See how Gosport Harbor 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; 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.