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Map of Sea Girt - 40' Mainship boat mold
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IntermediateBoat entry

Sea Girt - 40' Mainship boat mold

New Jersey, United States
AOW suggestedNew Jersey offshore reef/wreck diving17–22 m depthBoat entry3mm wetsuit typical

Boat dive — see Entry & access.

Sea Girt - 40' Mainship boat mold at a glance

Sea Girt - 40' Mainship boat mold is an intermediate boat dive site in New Jersey, United States with depths of 17.4–21.9 m (57–72 ft). Typically most favorable Jul · from 3 years of archive data. Divers commonly see Summer flounder (fluke), Tautog (blackfish), and Scup (porgy). Recent reports put the water around 24°C (74°F). Check the latest conditions and entry details before you go.

Marine model · graded 15h ago
0.6 mwaves — under a meter expected

Tap a factor for its source and model point · Forecast 24°C · seasonal avg 22°C

Site hazards: New Jersey offshore reef/wreck diving

Read the full hazards ↓

Dive windows this week

Best: Fri
Fri7:00–20:00
Sat7:00–20:00
Sun7:00–20:00
Mon7:00–20:00
Tue7:00–20:00
Wed7:00–20:00
Thu7:00–20:00

Favorable windowModerate window— no window

First light 6:05 · Sunrise 6:33 · Sunset 19:11

Source: Open-Meteo marine · model point 7.2 km from site · graded 15h 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: Tautog (blackfish), Scup (porgy), Rock crab
Best time: May through October is the prime season; late summer brings the warmest water and best visibility. Winter diving requires drysuit and experience.

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. Jan87%6°C0.9 m
  2. Feb91%5°C1.0 m
  3. Mar76%6°C1.1 m
  4. Apr87%10°C0.9 m
  5. May96%14°C0.9 m
  6. Jun97%18°C0.8 m
  7. Jul100%22°C0.7 m
  8. Aug96%22°C0.8 m
  9. Sep87%22°C1.1 m
  10. Oct88%18°C1.1 m
  11. Nov96%13°C0.8 m
  12. Dec90%8°C0.9 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

Artificial reef built from 40' Mainship boat mold (hull) NJDEP deployment record: Ship, material: 40' Mainship boat mold (hull), deployed 1987.

reefwreck

New Jersey offshore reef/wreck diving — cold water (near-freezing at depth in winter, mid-70s F at surface in summer) with thermoclines; limited visibility (often 5-20 ft); currents and surge; heavy fishing pressure means monofilament line and hanging gear on structure (cutting tool essential); boat traffic (SMB and dive flag required); structures may have sharp edges and unstable sections.

Reviews

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