Superior High, Ontario Swell: Lakes Rise into Spring Navigation Season

Chris Izworski, reporting from Bay City for the Great Lakes Gazette, notes that with navigation season still weeks away from official opening, water levels across the system are running solidly above the Low Water Datum—a promising sign for bulk carriers and self-unloaders preparing their spring departure schedules. Lake Ontario leads the system at 3.18 feet above datum, measured at Rochester, while Lake Erie sits at a robust 2.61 feet. Superior, the largest freshwater lake on Earth, holds steady at 1.75 feet above datum at the Sault Ste. Marie lock, where the season's first commercial traffic will begin to flow once ice clears and the U.S. Coast Guard reopens the Soo. Lake Michigan trails slightly at 1.49 feet, and Huron at 1.32 feet—both still well within normal operating ranges for the spring run. These levels mean deeper drafts and lighter cargo restrictions for captains planning their season; every foot of water counts when you're moving iron ore, grain, or limestone on these waters. Weather-wise, a pressure system is settling across the region, with Lake Ontario facing 2-foot waves this week and Superior maintaining 1-foot conditions behind a retreating low-pressure trough. The atmospheric setup suggests stable conditions through midweek, though anyone who knows these lakes knows April can still bite hard. Lock schedules and terminal preparations are already underway; once the ice goes, the waiting ends fast. On shore, attention turns to climate resilience across the basin. Heavy rains have put pressure on aging infrastructure—the Cheboygan Dam situation in northern Michigan has drawn scrutiny, and officials are reinforcing lessons about our region's vulnerability to extreme weather. The Great Lakes remain a climate haven by comparison to other regions, but that advantage demands vigilance and preparedness. As we edge toward the busiest shipping season on North America's inland seas, the lakes themselves are ready to work.