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Map of SS Henry Chisholm Wreck
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SS Henry Chisholm Wreck

Michigan, United States
AOW suggested6–46 m (20–150 ft) depthBoat entry

Boat dive — see Entry & access.

SS Henry Chisholm Wreck at a glance

SS Henry Chisholm Wreck is an advanced boat dive site in Michigan, United States with depths of 6.1–45.7 m (20–150 ft). Typically most favorable Jul · from 3 years of archive data. Divers commonly see Burbot and Lake trout. Check the latest conditions and entry details before you go.

Next window today· 9:00–19:00 · favorable & moderate · sunset 18:50

Wind forecast for this hour · 7:00 · run 5 h ago
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Tap a factor for its source and model point

Site hazards: Very cold water; elevated DCS risk · Extreme remoteness

All 4 hazards ↓

Dive windows this week

Lightest wind: Fri
Sun9:00–13:00 favorable, 13:00–14:00 moderate, 14:00–15:00 favorable, 15:00–18:00 moderate, 18:00–19:00 favorable

13 kn wind (13 kn wind)

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

9 kn wind (9 kn wind)

Tue9:00–11:00 favorable, 11:00–17:00 moderate

16 kn wind (16 kn wind)

Wed16:00–19:00 moderate

13 kn wind (13 kn wind)

Thu9:00–19:00 favorable

10 kn wind (10 kn wind)

Fri9:00–19:00 favorable

4 kn wind (4 kn wind)

Sat9:00–19:00 favorable

9 kn wind (9 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 7:59 · Sunrise 8:31 · Sunset 18:50 · some windows run past sunset

Source: Open-Meteo wind · updated 25 Oct, 01:26 GMT-4

Forecast only — always assess conditions on site.

Compare this weekend’s windows near SS Henry Chisholm 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 on calm days.

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, 81% of days have historically been favorable, wind has typically been 11 knots
  2. February, 76% of days have historically been favorable, wind has typically been 11 knots
  3. March, 78% of days have historically been favorable, wind has typically been 11 knots
  4. April, 72% of days have historically been favorable, wind has typically been 11 knots
  5. May, 87% of days have historically been favorable, wind has typically been 10 knots
  6. June, 91% of days have historically been favorable, wind has typically been 9 knots
  7. July, 98% of days have historically been favorable, wind has typically been 9 knots, historically most favorable
  8. August, 96% of days have historically been favorable, wind has typically been 9 knots
  9. September, 93% of days have historically been favorable, wind has typically been 9 knots
  10. October, 82% of days have historically been favorable, wind has typically been 11 knots
  11. November, 74% of days have historically been favorable, wind has typically been 12 knots
  12. December, 65% of days have historically been favorable, wind has typically been 13 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 Henry Chisholm, a big wooden bulk freighter of 1880, ran onto Rock of Ages Reef in October 1898 — the same reef that claimed the Cumberland in 1877 — and her wreckage lies intermingled with the older steamer's in 20-80 ft of water. The highlight is her monstrous double-compound steam engine with drive shaft and propeller, which sits upright at the base of the rocky wall in about 150 ft, rising to roughly 110 ft. The combination of shallow archaeology and a dramatic deep engine dive makes this one of Isle Royale's classic sites.

boatreefwallwreck

The engine site at ~140-150 ft is a deep, cold, dark dive

Very cold water; elevated DCS risk

Extreme remoteness — chambers in Minneapolis/Milwaukee

Exposed reef; intermingled debris is disorienting

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