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Boat entry

The Caves

Michigan, Canada
The dominant hazard on Great Lakes wrecks is cold waterBoat entry

Boat dive — see Entry & access.

The Caves at a glance

The Caves is a boat dive site in Michigan, Canada. Typically most favorable Jul · from 3 years of archive data. Divers commonly see Smallmouth bass, Crayfish, and Round goby (invasive). Check the latest conditions and entry details before you go.

Next window today· 8:00–19:00 · favorable · sunset 18:22

Wind forecast for this hour · 2:00 · run 13 h ago
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Tap a factor for its source and model point

Site hazards: The dominant hazard on Great Lakes wrecks is cold water

Read the full hazards ↓

Dive windows this week

Lightest wind: Tue
Mon8:00–19:00 favorable

10 kn wind (10 kn wind)

Tue8:00–19:00 favorable

6 kn wind (6 kn wind)

Wed8:00–19:00 favorable

7 kn wind (7 kn wind)

Thu15:00–16:00 moderate, 18:00–19:00 moderate

11 kn wind (11 kn wind)

Fri9:00–19:00 favorable

11 kn wind (11 kn wind)

Sat9:00–19:00 favorable

8 kn wind (8 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 7:26 · Sunrise 7:57 · Sunset 18:22 · some windows run past sunset

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

Forecast only — always assess conditions on site.

Compare this weekend’s windows near The Caves

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: Smallmouth bass, Crayfish, Round goby (invasive)
Best time: The practical dive season runs roughly May/June through September/October, with late summer to early fall generally offering the best conditions; winter diving is supremely challenging. Visibility is often excellent in the cold, clear freshwater of Lake Superior (commonly 30-100 ft) and good across the upper lakes, but is more variable and frequently murkier in shallower, warmer Lake Erie. Even in summer the surface can exceed 72 F while water at wreck depth stays a near-constant ~39 F (34-55 F range), with two to three thermoclines en route down.

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, 66% of days have historically been favorable, wind has typically been 13 knots
  2. February, 48% of days have historically been favorable, wind has typically been 14 knots
  3. March, 58% of days have historically been favorable, wind has typically been 13 knots
  4. April, 52% of days have historically been favorable, wind has typically been 13 knots
  5. May, 94% of days have historically been favorable, wind has typically been 10 knots
  6. June, 83% of days have historically been favorable, wind has typically been 10 knots
  7. July, 95% of days have historically been favorable, wind has typically been 8 knots, historically most favorable
  8. August, 92% of days have historically been favorable, wind has typically been 9 knots
  9. September, 92% of days have historically been favorable, wind has typically been 9 knots
  10. October, 75% of days have historically been favorable, wind has typically been 11 knots
  11. November, 46% of days have historically been favorable, wind has typically been 14 knots
  12. December, 53% 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

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 July 2026

Site details

The Caves is a dive site located in Canada. The site is reached by boat.

The dominant hazard on Great Lakes wrecks is cold water — surface temperatures may reach the 70s F in summer, but divers pass through two or three pronounced thermoclines and find the water perpetually cold (often 34-50 F / ~39 F constant) at the depths where wrecks rest, so hypothermia and the physiological effects of cold are a constant concern. Many of the most spectacular wrecks lie deep (70-110+ ft) where little sunlight penetrates, making them dark, cold dives that demand depth, gas-management and dark-water/low-light skills; penetration into intact hulls adds silt-out (loss of visibility from disturbed sediment) and overhead-environment entanglement risks on collapsed rigging, lines, fishing nets and monofilament left by anglers, so a cutting tool and disciplined buoyancy/finning are essential. Surfaces on infested wrecks are encrusted with sharp zebra and quagga mussels that can cut hands and gear, and divers should not scrape them off (it does not reliably keep them away and harms the wreck). Open-water lakes bring sudden weather changes, building seas and chop that can strand boats or complicate ascents, plus recreational and commercial boat traffic over popular dive sites, so surface marker buoys and clear surface-support communication are advised. Finally, all of Wisconsin's historic shipwrecks are held in public trust and protected by law: divers may not remove, deface, displace or destroy any artifact or structure from a wreck on public lands (Wis. Stats. 44.47 and 29.05), with violations punishable by fines up to $5,000 and seizure of boats and equipment; looting is reported to (800) TIP-WDNR.

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