Region Overview & Navigation
Columbia Glacier is a giant among Alaskan tidewater glaciers. The glacier has undergone rapid retreat since the 1980s, creating an immense, dynamic basin filled with towering icebergs and frozen flotsam.
Navigation & Safety
- Iceberg Hazards: Columbia Bay is filled with dense fields of icebergs of all sizes. Only a small fraction of an iceberg is visible above the water, and submerged portions (“growlers” and “bergy bits”) pose a severe hazard to hulls and props. Do not navigate through dense ice pack.
- Moraine Bar (Heather Island): The shallow terminal moraine at the mouth of the bay near Heather Island acts as a natural dam, trapping large icebergs inside the bay. Entering Columbia Bay requires finding a safe route across the shallow moraine sill, which should be done at slow speeds with a dedicated lookout.
- Glacial Waves: The active face of the Columbia Glacier is highly unstable and calves continuously. Never approach within 1 mile of the face due to the extreme danger of underwater calving and colossal wave actions.