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ExpertBoat entry

Twelve Mile Reef

New York, United States
Deep (123-143 ft)38–44 m depthBoat entry3mm wetsuit typical

Boat dive — see Entry & access.

Twelve Mile Reef at a glance

Twelve Mile Reef is an expert boat dive site in New York, United States with depths of 37.5–43.6 m (123–143 ft). Typically most favorable Jul · from 3 years of archive data. Divers commonly see Cunner, Black sea bass, and Scup (porgy). Recent reports put the water around 22°C (72°F). Check the latest conditions and entry details before you go.

Marine model · graded 14h ago
1.0 mwaves — about a meter expected

Tap a factor for its source and model point · Forecast 22°C · seasonal avg 21°C

Site hazards: Deep (123-143 ft)

Read the full hazards ↓

Dive windows this week

Best: Sat
Fri6:00–19:00
Sat6:00–19:00
Sun6:00–19:00
Mon6:00–19:00
Tue6:00–18:00
Wed6:00–18:00
Thu6:00–18:00

Favorable windowModerate window— no window

First light 4:59 · Sunrise 5:27 · Sunset 18:06

Source: Open-Meteo marine · model point 2.3 km from site · graded 14h ago

Forecast only — always assess conditions on site.

Forecast · NOAA tide model

Tide & slack timing

Loading tide predictions

Recent diver reports

Dated firsthand observations from divers — not current conditions.

No diver reports for this site yet. — one dated observation helps every diver after you.

Dived here today — did the forecast match?

What Divers Say

Known for: Cunner, Black sea bass, Scup (porgy)
Best time: Summer (warmest water, best visibility) on calm offshore days.

Based on community reviews and site data. Conditions vary — always verify before diving.

Best months, historically

What conditions have historically been typical at this site, month by month — not a forecast.

  1. Jan23%8°C1.9 m
  2. Feb21%7°C1.9 m
  3. Mar12%6°C2.0 m
  4. Apr37%8°C1.7 m
  5. May55%12°C1.4 m
  6. Jun68%17°C1.2 m
  7. Jul73%23°C1.1 m
  8. Aug60%22°C1.4 m
  9. Sep43%21°C1.6 m
  10. Oct34%18°C1.7 m
  11. Nov32%15°C1.7 m
  12. Dec26%11°C1.9 m

July hastypically had the largest share of favorable days here. Conditions vary year to year — this is historical context, not a forecast.

Based on 3 years of archive data. Bar height shows the share of days each month whose conditions have historically scored favorably.

Marine life seen at this site

Species noted at this site — not a promise of what you’ll encounter.

Species seen here

Fills & rentals nearby

No dive shops mapped within 25 km. Know one? Add it to the map.

Data updated June 2026

Site details

Twelve Mile Reef (the '12 Mile Reef') is an 850-acre NYSDEC artificial reef in the Atlantic Ocean about 12 nautical miles from Moriches and Shinnecock Inlets, in 123-143 ft of water. It holds two vessels, 16 steel center-beam railcars, rock and ECOncrete and is referenced by Long Island wreck divers, but its depth places it at or beyond recreational limits—an expert/technical boat dive. Black sea bass, tautog and scup populate the structure; visibility is variable.

boatreefwreck

Deep (123-143 ft) — at/beyond recreational limits, requiring deco/technical planning; 12 nm offshore in open Atlantic with current and swell; cold/dark at depth; fishing tackle on wrecks.

Reviews

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