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ExpertBoat entry

Twelve Mile Reef

New York, United States
Deep (123-143 ft)38–44 m (123–143 ft) depthBoat entry7mm or semi-dry + hood 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 17°C (62°F). Check the latest conditions and entry details before you go.

Favorable window now· until 17:00 · sunset 16:54

Forecast for this hour · 7:00 · run 6 h ago
0.8 m (2.8 ft)waves — under a meter expected (waves — about three feet expected)

Tap a factor for its source and model point · Forecast 17°C · seasonal avg 18°C ( · Forecast 62°F · seasonal avg 64°F)

Site hazards: Deep (123-143 ft)

Read the full hazards ↓

Dive windows this week

Mon7:00–17:00 favorable

0.9 m waves · 14 kn wind (2.9 ft waves · 14 kn wind)

Tue7:00–17:00 favorable

1.0 m waves · 13 kn wind (3.3 ft waves · 13 kn wind)

Wed7:00–17:00 favorable

0.7 m waves · 3 kn wind (2.3 ft waves · 3 kn wind)

Thu7:00–17:00 favorable

0.6 m waves · 11 kn wind (1.8 ft waves · 11 kn wind)

Fri7:00–17:00 favorable

0.7 m waves · 16 kn wind (2.3 ft waves · 16 kn wind)

Sat7:00–17:00 favorable

0.6 m waves · 10 kn wind (1.9 ft waves · 10 kn wind)

Sun7:00–17:00 favorable

0.9 m waves · 6 kn wind (2.9 ft waves · 6 kn wind)

Favorable windowModerate window— no window

Every forecast dive window each day, site-local time, from wave and wind forecasts. Numbers under each bar are daylight averages.

First light 5:45 · Sunrise 6:13 · Sunset 16:54 · some windows run past sunset

Source: Open-Meteo marine · model point 2.3 km from site · updated 26 Oct, 00:28 GMT-5

Forecast only — always assess conditions on site.

Compare this weekend’s windows near Twelve Mile Reef

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. January, 23% of days have historically been favorable, water has typically been 8°C (47°F), waves have typically been 1.9 m (6.3 ft), wind has typically been 24 knots
  2. February, 21% of days have historically been favorable, water has typically been 7°C (44°F), waves have typically been 1.9 m (6.2 ft), wind has typically been 22 knots
  3. March, 12% of days have historically been favorable, water has typically been 6°C (43°F), waves have typically been 2.0 m (6.5 ft), wind has typically been 22 knots
  4. April, 37% of days have historically been favorable, water has typically been 8°C (46°F), waves have typically been 1.7 m (5.5 ft), wind has typically been 20 knots
  5. May, 55% of days have historically been favorable, water has typically been 12°C (54°F), waves have typically been 1.4 m (4.6 ft), wind has typically been 17 knots
  6. June, 68% of days have historically been favorable, water has typically been 17°C (63°F), waves have typically been 1.2 m (4.0 ft), wind has typically been 17 knots
  7. July, 73% of days have historically been favorable, water has typically been 23°C (74°F), waves have typically been 1.2 m (3.8 ft), wind has typically been 15 knots, historically most favorable
  8. August, 60% of days have historically been favorable, water has typically been 22°C (72°F), waves have typically been 1.4 m (4.5 ft), wind has typically been 16 knots
  9. September, 43% of days have historically been favorable, water has typically been 21°C (70°F), waves have typically been 1.6 m (5.3 ft), wind has typically been 17 knots
  10. October, 34% of days have historically been favorable, water has typically been 18°C (64°F), waves have typically been 1.7 m (5.7 ft), wind has typically been 19 knots
  11. November, 32% of days have historically been favorable, water has typically been 15°C (59°F), waves have typically been 1.7 m (5.5 ft), wind has typically been 23 knots
  12. December, 26% of days have historically been favorable, water has typically been 11°C (51°F), waves have typically been 2.0 m (6.4 ft), wind has typically been 23 knots

July has typically 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

Rough labels: “Commonly seen” usually means two or more recorded sightings near this site in public dive logs (GBIF), “Occasionally seen” one; “Seasonal” and “Rarely seen” come from dive-guide research. Not a measured rate.

Fills & rentals nearby

No dive shops mapped within 25 km (16 mi). 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.

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