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418-acre Mount Sinai Harbor fishing map with NOAA BlueTopo survey contours (93.89% measured, 99.83% assessed), charted rock and wreck structure, regional fish-survey occurrence, sourced forage timing and verified public access. The water tops out around 39 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's the year, species by species, as the scoring engine sees it.
Drawn out, this is 417 acres of water rimmed by 14.9 miles of bank — 32 islands included. That shoreline is heavily fingered (development index 5.2) — bays, points and pockets everywhere, which multiplies the fishable edge. About 67% of the surface sits shallower than 15 ft — that's the weed-and-bait zone. Tip to tip the water measures near 1.4 mi with a 1.1-mi widest point. Closest neighbour on DepthScout: Port Jefferson Harbor, 3 mi west of here.
Spring striped bass on Mount Sinai Harbor hold shallow, usually 5 to 20 ft. By summer they slide out to 12 to 39 ft, and by winter most fish are in 12 to 39 ft. The chart's best answer is Surveyed channel edge — drop-off, 22 ft, prime for summer. 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 | Surveyed channel edge (15 ft) | Bucktail jig + trailer, Walking topwater (dawn) |
| Summer | 12 to 39 ft | dawn & dusk | Surveyed channel edge (22 ft) | Flutter spoon (deep), Umbrella rig (trolled) |
| Fall | 10 to 35 ft | dawn & dusk | Surveyed channel edge (22 ft) | Topwater walker, Jerkbait |
| Winter | 12 to 39 ft | midday | Surveyed channel edge (22 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 12 to 39 ft. Surveyed channel edge is the standout, a drop-off at roughly 22 ft, rated prime for summer 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 | Shallow feeding flat (20 ft) | Metal (Hopkins/Kastmaster), Pencil popper |
| Summer | 5 to 30 ft | dawn & dusk | Surveyed channel edge (22 ft) | Popper (early/late), Metal jigs in the rips |
| Fall | 3 to 25 ft | dawn & midday | Shallow feeding flat (20 ft) | Pencil popper, Big metal |
| Winter | 12 to 39 ft | midday | Surveyed channel edge (22 ft) | Metal jig worked slow (southern waters) |
Early season summer flounder (fluke) use the shallows, holding in 5 to 25 ft. Summer is an 8 to 35 ft game here, winter a 12 to 39 ft one. The chart's best answer is Surveyed channel edge — drop-off, 22 ft, prime for summer. Best bite is midday and early morning. Tie on a bucktail (1-3 oz by drift speed) or a gulp grub on jighead and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 25 ft | midday & dawn | Surveyed channel edge (22 ft) | Bucktail + Gulp swimming mullet, Hi-lo rig + squid strip |
| Summer | 8 to 35 ft | midday & dawn | Surveyed channel edge (22 ft) | Bucktail (1-3 oz by drift speed), Gulp grub on jighead |
| Fall | 10 to 39 ft | midday | Surveyed channel edge (22 ft) | Heavier bucktail on the lumps, Big Gulp 6" grub |
| Winter | 12 to 39 ft | midday | Surveyed channel edge (22 ft) | Slow bottom rig + strip |
Spring black sea bass on Mount Sinai Harbor hold shallow, usually 10 to 39 ft. Depth-wise the year is flat: 10 to 39 ft in summer, 12 to 39 ft once it turns cold. The chart's best answer is Dangerous NOAA charted wreck — wreck, 23 ft, prime for spring. Prime time lands in midday and early morning. The summer box starts with a bucktail + grub or a diamond jig + squid teaser.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 10 to 39 ft | midday & dawn | Dangerous NOAA charted wreck (23 ft) | Hi-lo rig + squid, 1-2 oz bucktail + Gulp |
| Summer | 10 to 39 ft | midday & dawn | Dangerous NOAA charted wreck (23 ft) | Bucktail + grub, Diamond jig + squid teaser |
| Fall | 10 to 39 ft | midday | Dangerous NOAA charted wreck (23 ft) | 3-4 oz vertical jig (deep), Double-teaser rig |
| Winter | 12 to 39 ft | midday | Dangerous NOAA charted wreck (23 ft) | Heavy hi-lo rig on deep wrecks |
The spring pattern is a shallow one: tautog (blackfish) in 5 to 25 ft. As the season builds they drop to 10 to 35 ft, wintering in 12 to 39 ft. Top water on the chart: Dangerous NOAA charted wreck, a wreck in the 23 ft range, prime in spring. Time it for early morning. Summer baits: a 1/2-1 oz tog jig + crab gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 25 ft | midday & dawn | Dangerous NOAA charted wreck (23 ft) | Tog jig + green crab half, Bare jig + clam (early) |
| Summer | 10 to 35 ft | dawn | Dangerous NOAA charted wreck (23 ft) | 1/2-1 oz tog jig + crab |
| Fall | 8 to 39 ft | midday | Dangerous NOAA charted wreck (23 ft) | Tog jig + whole green crab, Old-school rig + double crab (deep) |
| Winter | 12 to 39 ft | midday | Dangerous NOAA charted wreck (23 ft) | Heavy jig + crab on deep structure |
The chart marks 7 structure features on Mount Sinai Harbor; the deepest is Dangerous NOAA charted wreck at about 23 ft.
Access data: New York State DEC — Boat Launches (FishNY). Confirm conditions and fees locally before you launch.
Season dates, license requirements, and size and bag limits for New York waters are set by the New York DEC (saltwater fishing) — and special regulations can apply to Mount Sinai Harbor specifically, so confirm the current rules before you fish.
Check the official New York fishing regulations →
Mount Sinai Harbor is about 39 ft (12 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) on Mount Sinai Harbor.
Surveyed channel edge is the top-rated area: a drop-off in about 22 ft of water that rates prime for summer flounder (fluke) in summer. Scroll up to the map for the complete spot list by 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 Mount Sinai Harbor is regulated by the New York DEC (saltwater fishing). Check the official New York regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Port Jefferson Harbor 3 mi · Artist Lake 7 mi · Smithtown Bay 9 mi · Lake Ronkonkoma 10 mi · Deep Pond 11 mi · Blydenburgh Lake 13 mi · Frash Pond 16 mi, CT · Knapps Lake 18 mi · Northport Bay 18 mi · Centerport Harbor 19 mi · Wildwood Lake 19 mi · Cockenoe Harbor 20 mi, CT
See how Mount Sinai Harbor stacks up: best striped bass lakes in New York · best summer flounder (fluke) lakes in New York · best bluefish lakes in New York · best black sea bass lakes in New York
Browse all New York fishing maps or see every water on DepthScout. Bathymetry credit: NOAA BlueTopo (NAVD88; 94% measured, 6% 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.