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Map of Grecian Wreck (Thunder Bay National Marine Sanctuary)
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Grecian Wreck (Thunder Bay National Marine Sanctuary)

Michigan, United States
AOW suggested23–31 m depthBoat entry

Boat dive — see Entry & access.

Grecian Wreck (Thunder Bay National Marine Sanctuary) at a glance

Grecian Wreck (Thunder Bay National Marine Sanctuary) is an advanced boat dive site in Michigan, United States with depths of 22.9–30.5 m (75–100 ft). Typically most favorable Jul · from 3 years of archive data. Divers commonly see Smallmouth bass, Round goby, and Zebra/quagga mussel. Check the latest conditions and entry details before you go.

Wind model · graded 14h ago
—

Tap a factor for its source and model point

Site hazards: Depth near recreational limits, cold water at depth, collapsing midship structure, disorientation/silt in holds

Read the full hazards ↓

Dive windows this week

Best: Thu
Fri8:00–16:00
Sat10:00–12:00
Sun8:00–20:00
Mon8:00–20:00
Tue15:00–20:00
Wed8:00–20:00
Thu8:00–20:00

Favorable windowModerate window— no window

First light 6:37 · Sunrise 7:07 · Sunset 19:51

Source: Open-Meteo wind · 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: Round goby, Zebra/quagga mussel, Burbot
Best time: June-September

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. Jan12% 21 kn
  2. Feb11% 22 kn
  3. Mar6% 21 kn
  4. Apr14% 20 kn
  5. May32% 15 kn
  6. Jun31% 16 kn
  7. Jul43% 14 kn
  8. Aug29% 16 kn
  9. Sep40% 15 kn
  10. Oct11% 20 kn
  11. Nov2% 23 kn
  12. Dec9% 22 kn

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

Facts from OpenStreetMap, corrected by the community — listed by distance only. Details change; confirm with the shop.

Shop facts come from OpenStreetMap and community corrections, shown nearest first. PickADive lists facts and contacts only — no listing is sponsored or ranked.

Data updated June 2026

Site details

The Grecian, a 296-ft steel bulk freighter launched in 1891, sank in 1906 while under tow after a collision and now lies in roughly 100 ft of water in Thunder Bay National Marine Sanctuary off Alpena. The deck is reached around 75 ft, and divers can explore the triple-expansion engine, boiler, decks and cargo holds; the collapsing midships section can be disorienting. NOAA typically places mooring buoys on both bow and stern in season.

boatwreck

Depth near recreational limits, cold water at depth, collapsing midship structure, disorientation/silt in holds

Reviews

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