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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 (75–100 ft) 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.

Next window today· 9:00–19:00 · favorable · sunset 18:28

Wind forecast for this hour · 1:00 · run under 1 h ago
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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

Lightest wind: Sat
Tue9:00–19:00 favorable

13 kn wind (13 kn wind)

Wed9:00–12:00 moderate, 12:00–16:00 favorable, 16:00–18:00 moderate, 18:00–19:00 favorable

14 kn wind (14 kn wind)

Thu12:00–15:00 moderate, 15:00–19:00 favorable

10 kn wind (10 kn wind)

Fri9:00–10:00 moderate, 10:00–19:00 favorable

9 kn wind (9 kn wind)

Sat9:00–19:00 favorable

8 kn wind (8 kn wind)

Sun9:00–19:00 favorable

10 kn wind (10 kn wind)

Mon9:00–11:00 favorable, 11:00–19:00 moderate

14 kn wind (14 kn wind)

Favorable windowModerate window— no window

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

First light 7:34 · Sunrise 8:04 · Sunset 18:28 · some windows run past sunset

Source: Open-Meteo wind · updated 27 Oct, 01:19 GMT-4

Forecast only — always assess conditions on site.

Compare this weekend’s windows near Grecian Wreck (Thunder Bay National Marine Sanctuary)

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. January, 12% of days have historically been favorable, wind has typically been 21 knots
  2. February, 11% of days have historically been favorable, wind has typically been 22 knots
  3. March, 6% of days have historically been favorable, wind has typically been 21 knots
  4. April, 14% of days have historically been favorable, wind has typically been 20 knots
  5. May, 32% of days have historically been favorable, wind has typically been 15 knots
  6. June, 31% of days have historically been favorable, wind has typically been 16 knots
  7. July, 43% of days have historically been favorable, wind has typically been 14 knots, historically most favorable
  8. August, 29% of days have historically been favorable, wind has typically been 16 knots
  9. September, 40% of days have historically been favorable, wind has typically been 15 knots
  10. October, 11% of days have historically been favorable, wind has typically been 20 knots
  11. November, 2% of days have historically been favorable, wind has typically been 23 knots
  12. December, 9% of days have historically been favorable, wind has typically been 22 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

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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