Scuba

What It Feels Like

Dive a nationally significant cluster of Lake Superior wrecks, including SS America, SS Emperor and SS Glenlyon, using licensed or properly equipped vessel support. The NPS specifies individual permits, permanent artifact protections, severe cold-water exposure and no shore-based air-fill facilities. The named charter recommends advanced cold-water/wreck experience rather than beginner certification alone.

Signature Sites

Advanced

SS America
Freighter in Washington Harbor with unusually shallow bow remains and substantially deeper sections.
SS Emperor (bow)
Large steel bulk freighter near the northeast end of Isle Royale; the bow is the shallower part of a site whose stern lies deeper.
SS Glenlyon
Scattered steel-freighter remains on a reef near Menagerie Island/Siskiwit Bay, including large machinery sections.

Planning Playbook

Operator Checklist

There are no public island air/gas fills. A charter may have a compressor, but the park allows private/onboard compressor operation only at specified places and hours. The 2026 Compendium also has detailed decontamination rules; its full drying option is 14 days, while a general NPS scuba page still mentions seven days. Treat the more specific current park instructions as controlling and clarify the inconsistency before travel.

Conditions Fallback

There are no public island air/gas fills. A charter may have a compressor, but the park allows private/onboard compressor operation only at specified places and hours. The 2026 Compendium also has detailed decontamination rules; its full drying option is 14 days, while a general NPS scuba page still mentions seven days. Treat the more specific current park instructions as controlling and clarify the inconsistency before travel.

Avoid

Each scuba diver must register at Rock Harbor, Windigo or the Houghton Visitor Center before diving and return the completed permit afterward. NPS instructions. Do not rely on an unverified charter seat or on normal passenger ferries to deliver a dive outing.
The 2026 Compendium limits wreck mooring buoys to permitted diving operations, a maximum of two vessels at a time, and no overnight stay on wreck buoys. Check buoy-on-station status and do not anchor onto historic wreckage. Shipwreck America has a summer 10 a.m.-noon local restriction; NPS materials differ on the precise effective date, so confirm with a ranger and permit before planning a morning dive.

Scuba In 30 Seconds

Best Window: July through August, within the operator-advertised June to mid-September season
Typical Level: Advanced or equivalent experienced cold-water and wreck diver; technical/decompression and overhead qualifications for applicable sections - Site-dependent, from shallow remains to more than 60 m. Kamloops is listed around 53 m to 79 m; do not treat any site as a single standard depth.
Start Here: SS America, SS Emperor (bow), SS Glenlyon
Risk To Watch: Cold shock, hypothermia and deep-water darkness

Bring List

Bring

Trained drysuit use and insulation
Cold-water-rated regulators with redundant gas planning
Hood and gloves suitable for near-freezing deep water
Redundant surface signaling and dive flag arrangements
Oxygen and first aid on support vessel

Optional

Independent dive light and backup as training requires

Isle Royale Activity Planning

Scuba

What It Feels Like

Signature Sites

Advanced

Planning Playbook