Shotline Diving

Connecting You to the Depths of the Great Lakes

St. Mary’s River

St. Marys River – Wrecks, Structures & Dive Sites Connecting You to the Depths of the Great Lakes & Rivers The St. Mary’s River connects the cold, deep waters of Lake Superior to Lake Huron through one of the most important shipping corridors on the Great Lakes. Its strong currents, historic channels, and centuries of…

St. Marys River – Wrecks, Structures & Dive Sites

Connecting You to the Depths of the Great Lakes & Rivers

The St. Mary’s River connects the cold, deep waters of Lake Superior to Lake Huron through
one of the most important shipping corridors on the Great Lakes. Its strong currents, historic channels,
and centuries of commercial and military use have left behind submerged structures, navigation features,
and a collection of lesser-known wrecks.

This narrow but crucial waterway has served Indigenous trade networks, fur companies, steamship lines,
logging transport, and modern lakers. The shifting channels and heavy vessel traffic have shaped a unique
underwater environment rich in industrial history and river archaeology.

Regional Map & Planning Tools

Use the St. Marys River map together with the Master Wreck Index: the map for currents and access,
the index for depths, GPS, and links into full Shotline dive records.

St. Marys River – Shotline Map

Interactive Shotline map layer for the St. Marys River, showing wrecks, structures, and
points of interest between Lake Superior and Lake Huron. Click markers for quick details
and links to full site pages.

Mode: Leaflet-based Shotline map
Includes: wrecks & river sites



Master Wreck Index – St. Marys River

Filtered view of St. Marys River records, including depths, GPS (where available), body-of-water tags,
and links to Shotline-format wreck and shore dive pages.

Scope: St. Marys River corridor
Format: sortable table

Featured “Must Dive” Sites – St. Marys River

Selected sites in the St. Marys River tagged as Must Dive in the Shotline archive.
Depths are approximate and planning-only – always read the full site page, confirm current,
and dive within your training and experience.


[sld_must_dive_grid body_of_water=”St. Marys River” posts_per_page=”4″]

Weather & Conditions

Emergency Information

Emergency: 911
US Coast Guard Sector Sault Ste. Marie: VHF 16
JRCC Trenton (Canadian waters): 1-800-267-7270
Nearest Hyperbaric Chambers: Sault Ste. Marie, ON / Marquette, MI

Preservation & Regional Organizations

References & Links

  • NOAA charts
  • C-3 Inland Waters Wreck Register
  • Michigan Underwater Preserves
  • Maritime History of the Great Lakes
  • Shotline Diving Master Index