Soo locks - credit By August Schwerdfeger

The Ice Doesn't Read the Calendar

Cover photo by August Schwerdfeger - Own work, CC BY 4.0, Link

At 12:01 in the morning on March 25, in the dark, in Michigan's Upper Peninsula, a 125-foot tug called the Dirk S. VanEnkevort slid through the Poe Lock with a 740-foot barge in tow.

Watching from the dock, in the cold, were roughly 150 people.

These are the boatnerds - a self-applied term for the dedicated observers who track Great Lakes vessel traffic the way others follow sports teams, complete with real-time AIS tracking apps, preferred vantage points, and genuine opinions about which stretches of the St. Marys River are worth the drive. They had gathered at midnight to witness the first transit of the 2026 Great Lakes shipping season. The captain, Bruce Beeker of Traverse City, received a plaque from the Soo Locks Visitors Association, baseball caps for his crew, and the distinction of being the first vessel through in another year.

By Thursday, eleven ships were stuck in ice.

The Soo Locks - the parallel lock chambers on the St. Marys River in Sault Ste. Marie, Michigan - have been governing access between Lake Superior and the lower Great Lakes since 1855, when the steamer Illinois became the first vessel to pass through the original timber-crib structures. The problem the locks solve is simple:

Lake Superior sits 21 feet higher than Lake Huron, connected by a river full of rapids that once forced portage around everything. The 1,200-foot Poe Lock, the largest of the current chambers, handles that elevation difference in a matter of minutes.

By law, the Poe Lock closes January 15 for winter maintenance and reopens March 25. The timing has a logic to it. Great Lakes shipping moves iron ore, limestone, coal, and grain for steel mills, power plants, and grain terminals across the industrial Midwest. Every day the locks stay closed is a day those supply chains wait, and the downstream effects - on production schedules, on steel pricing, on the grain markets - accumulate quickly. So the U.S. Army Corps of Engineers works toward March 25 with the focus of people who know the calendar is not a suggestion.

This year, as in most years, they hit the date.

What the lake was doing on March 25, 2026, was ice.

Whitefish Bay  the natural funnel at the eastern end of Lake Superior, where ships must pass before reaching the St. Marys River and the locks  was coated in ice more than two feet thick in sections. As many as eleven cargo vessels found themselves unable to proceed after the locks opened. Not by breakdown, not by mechanical failure, but by the straightforward physics of fresh water that has frozen solid and has no opinion about shipping schedules.

There is something quietly funny about this situation. The season is open. The paperwork is filed. The captain of the VanEnkevort has his plaque. Eleven ships are going nowhere.

The U.S. Coast Guard maintains icebreaking vessels to escort traffic through troubled stretches of the lakes. Its dedicated Great Lakes heavy icebreaker is the USCGC Mackinaw, commissioned in 2006, capable of breaking through 32 inches of ice. The Mackinaw is the obvious response to a situation involving eleven vessels and two feet of frozen lake.

This year, the Mackinaw was unable to pass through the Soo Locks due to maintenance concerns.

The one vessel built specifically for this problem could not reach the problem.

Smaller Coast Guard cutters worked the ice as best they could. Ships eventually moved. The VanEnkevort and the Michigan Trader made their delivery run — iron ore from Superior, Wisconsin, to Toledo, Ohio  and the season ground forward in fits and starts across the days following the opening.

This pattern is not unusual. A survey of recent Great Lakes shipping seasons shows ice delays in the opening week are common enough to be considered part of the process rather than a disruption to it. The locks open; ice complicates things; icebreakers work; traffic flows. The calendar says March 25. The lakes maintain a separate schedule, and the two coexist in a state of ongoing negotiation.

The tradition of greeting the first ship reaches back into the early decades of organized Great Lakes commerce. Dignitaries, local boosters, and boatnerds have gathered at the locks in predawn cold to mark the moment when, officially, another season begins. The captain gets gifts. The crew gets caps. One hundred and fifty people who drove to Sault Ste. Marie at midnight to watch a barge pass through a lock do not consider this strange. They have been doing it, in various forms, for generations.

What might look strange from the outside is the way the whole choreography proceeds  the opening, the ceremony, the plaque, the ships queuing up behind a bottleneck of ice  against a lake that does not acknowledge any of it. Lake Superior freezes when it freezes and thaws when it thaws. In 2026, the season's first week overlapped with a late-season winter storm moving across the Upper Midwest. Ice conditions in parts of the upper lakes remained above average for the date.

The locks opened on schedule anyway. They always do.

The Dirk S. VanEnkevort made it to Superior, Wisconsin. The iron ore eventually reached Toledo. The eleven ships that were beset near Whitefish Bay worked free over the days that followed. By April, traffic through the Soo Locks was moving at a pace that looked, from the outside, entirely normal.

None of this is lost on the people who watch Great Lakes shipping closely. They know the season is always officially underway before it is practically underway. They know the lakes set their own terms. They show up at midnight with their AIS apps and their patience and their genuine enthusiasm for watching a tug and barge lock through in the dark, and they understand that the ceremony is not a claim about what the lake will do next.

It's an acknowledgment that you showed up, you're ready, and you're prepared to wait.

The season is open. The ice is the ice.

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