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Map of Chester A. Congdon Wreck
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Chester A. Congdon Wreck

Michigan, United States
AOW suggestedVery cold water (1-3 C below 50 ft)6–61 m (20–200 ft) depthBoat entry

Boat dive — see Entry & access.

Chester A. Congdon Wreck at a glance

Chester A. Congdon Wreck is an advanced boat dive site in Michigan, United States with depths of 6.1–61 m (20–200 ft). Typically most favorable Jul · from 3 years of archive data. Divers commonly see Lake trout and Burbot. Check the latest conditions and entry details before you go.

Favorable window now· until 19:00 · sunset 18:45

Wind forecast for this hour · 9:00 · run 19 h ago
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Tap a factor for its source and model point

Site hazards: Very cold water (1-3 C below 50 ft) · Extreme remoteness · Deep stern section beyond recreational limits

All 5 hazards ↓

Dive windows this week

Lightest wind: Sat
Mon9:00–19:00 favorable

9 kn wind (9 kn wind)

Tue9:00–16:00 favorable, 16:00–18:00 moderate

13 kn wind (13 kn wind)

Wed12:00–13:00 moderate, 13:00–19:00 favorable

12 kn wind (12 kn wind)

Thu9:00–19:00 favorable

11 kn wind (11 kn wind)

Fri9:00–19:00 favorable

7 kn wind (7 kn wind)

Sat9:00–19:00 favorable

5 kn wind (5 kn wind)

SunNot in the forecast yet

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 7:58 · Sunrise 8:30 · Sunset 18:45 · some windows run past sunset

Source: Open-Meteo wind · updated 25 Oct, 13:20 GMT-4

Forecast only — always assess conditions on site.

Compare this weekend’s windows near Chester A. Congdon Wreck

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

Best time: June-September; calm, clear days for the exposed Canoe Rocks area.

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, 40% of days have historically been favorable, wind has typically been 15 knots
  2. February, 40% of days have historically been favorable, wind has typically been 15 knots
  3. March, 49% of days have historically been favorable, wind has typically been 14 knots
  4. April, 44% of days have historically been favorable, wind has typically been 15 knots
  5. May, 59% of days have historically been favorable, wind has typically been 13 knots
  6. June, 72% of days have historically been favorable, wind has typically been 12 knots
  7. July, 86% of days have historically been favorable, wind has typically been 10 knots, historically most favorable
  8. August, 76% of days have historically been favorable, wind has typically been 12 knots
  9. September, 70% of days have historically been favorable, wind has typically been 12 knots
  10. October, 43% of days have historically been favorable, wind has typically been 15 knots
  11. November, 32% of days have historically been favorable, wind has typically been 16 knots
  12. December, 45% of days have historically been favorable, wind has typically been 16 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

The Chester A. Congdon was a 532-ft steel bulk freighter that ran onto Congdon Shoal at Canoe Rocks in fog in November 1918 and broke apart, becoming one of Lake Superior's first million-dollar losses. The bow section with its intact pilothouse sits upright in roughly 70-110 ft on the south side of the reef, while the intact stern lies on the north side, with wreckage running from near-surface shoal depths down past recreational limits. It is one of the signature dives of Isle Royale National Park, marked by an NPS mooring buoy.

boatwreck

Very cold water (1-3 C below 50 ft) — elevated DCS risk

Extreme remoteness — nearest recompression chambers in Minneapolis and Milwaukee

Rapidly changeable Lake Superior weather over an exposed shoal

Deep stern section beyond recreational limits

Penetration hazards in intact pilothouse and stern (silt, confined passages)

Reviews

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