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AdvancedBoat entry

Great Isaac

New Jersey, United States
AOW suggested23–27 m depthBoat entry3mm wetsuit typical

Boat dive — see Entry & access.

Great Isaac at a glance

Great Isaac is a advanced boat dive site in New Jersey, United States with depths of 23–27.4 m (75–90 ft). Typically most favorable Jul · from 3 years of archive data. Divers commonly see hydroids and anemones, lobster, and wreck-associated fish. Recent reports put the water around 23°C (73°F). Check the latest conditions and entry details before you go.

Marine model · graded 5h ago
1.0 mwaves — about a meter expected

Tap a factor for its source and model point · Forecast 23°C · seasonal avg 23°C

Site hazards: Offshore distance, current, cold bottom temperatures, variable visibility, boat traffic, fishing line/entanglement, sharp wreckage, and possible silt or snag hazards around exposed ribs and plates.

Read the full hazards ↓

Dive windows this week

Best: Mon
Sun5:00–20:00
Mon5:00–20:00
Tue5:00–20:00
Wed5:00–17:00
Thu5:00–20:00
Fri5:00–20:00
Sat5:00–20:00

Favorable windowModerate window— no window

First light 4:19 · Sunrise 4:50 · Sunset 19:14

Source: Open-Meteo marine · model point 5.3 km from site · graded 5h 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.

What Divers Say

Known for: hydroids and anemones, wreck-associated fish
Best time: Best in settled summer/fall weather windows when offshore seas and current are manageable; verify visibility and current with the charter before departure.

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. Jan35%6°C1.5 m
  2. Feb32%5°C1.5 m
  3. Mar28%6°C1.6 m
  4. Apr43%9°C1.4 m
  5. May67%14°C1.3 m
  6. Jun71%18°C1.1 m
  7. Jul76%23°C1.0 m
  8. Aug65%22°C1.3 m
  9. Sep44%22°C1.6 m
  10. Oct46%19°C1.6 m
  11. Nov44%14°C1.3 m
  12. Dec42%9°C1.5 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

  • hydroids and anemonesCommonly seen
  • lobsterOccasionally seen
  • wreck-associated fishCommonly seen

Fills & rentals nearby

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

Site details

Great Isaac is a large V4-M-A1 ocean tug wreck off southern New Jersey. NJScuba describes the wreck in about 90 ft / 27 m, lying on its port side and partly buried, with exposed ribs and structure. This is an offshore wreck dive for experienced divers, not a beginner reef stop.

boatwreck

Offshore distance, current, cold bottom temperatures, variable visibility, boat traffic, fishing line/entanglement, sharp wreckage, and possible silt or snag hazards around exposed ribs and plates.

Reviews

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