Correction: Corrected September 17, 2026: the water-level paragraph now reports the archived NOAA station observations and their limits. Unsupported navigation implications were withdrawn. NOAA measurement context.
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The ones still watching will know where to stand: St. Marys Challenger is back in service after her five-year drydocking at Bayship in Sturgeon Bay, new paint applied and hull work complete. She unloaded in Milwaukee Thursday, then departed Sturgeon Bay bound for Manitowoc with a partial load of cement.
Five years is a long rotation. The people who watched Challenger work the cement trade the last time have had time to move on or simply forget. What the data shows now is a working boat heading back to a familiar dock.
At Sturgeon Bay, tug Prentiss Brown still has work to finish. Bradshaw Mckee has stepped in to cover, and St. Marys Conquest remains at the yard for now. The cement fleet is reshuffling around the one boat that matters most this weekend.
The Stewart J. Cort returned to service Thursday evening at Duluth-Superior after propulsion repairs that held her at the SMET coal dock for several weeks. She was heading to the fuel dock before moving to BNSF to load ore. That loading will be her first productive run since the repairs ended.
Toledo took in two arrivals Saturday: Baie Comeau to CSX and Lee A. Tregurtha to Ironville. Clyde S. VanEnkevort, running with the Erie Trader, cleared Toledo for Detroit the same day.
James R. Barker arrived at Conneaut with ore for the P&C Dock, one of the cleaner ore calls on Erie's south shore this weekend.
Dorothy Ann and Pathfinder worked a limestone turn across Erie's western end: arrived at Amrize in Marblehead, loaded, then delivered limestone to Allied Road Products in Cleveland. Pearl Mist departed Cleveland for Port Colborne the same day.
At Buffalo, Algoma Innovator was unloading salt.
Archived NOAA station observations: Lake Superior, Sault Ste. Marie (NOAA station 9076027): 1.768 feet relative to local Low Water Datum, observed 2026-07-31 23:54 local standard time. Lake Michigan, Chicago (NOAA station 9087031): 2.254 feet relative to local Low Water Datum, observed 2026-07-31 23:54 local standard time. Lake Huron, Harbor Beach, MI (NOAA station 9075002): 2.215 feet relative to local Low Water Datum, observed 2026-07-31 23:54 local standard time. Lake Erie, Cleveland (NOAA station 9063053): 2.966 feet relative to local Low Water Datum, observed 2026-07-31 23:54 local standard time. Lake Ontario, Rochester, NY (NOAA station 9052030): 3.612 feet relative to local Low Water Datum, observed 2026-07-31 23:54 local standard time. These are individual gauge readings, not lake-wide averages or channel depths. They do not establish vessel clearance, cargo limits or comparative navigability.
A 29.60-inch low moved into Ohio today, tracking east just south of Lake Erie's shoreline, and it will drag through Sunday before 30.00-inch high pressure rebuilds early next week. Rain and isolated thunderstorms are possible on Huron and Erie both today and Sunday. Waves are sitting at one foot on Erie and two feet on the other lakes, enough for a working chop but not enough to stop a loaded boat. Sunday looks like the rougher day before the pattern firms.
Nine U.S. Great Lakes ports collected the Robert J. Lewis Pacesetter Award from the Great Lakes St. Lawrence Seaway Development Corporation Friday, recognized for moving more than 4 million metric tons of international cargo during the 2025 navigation season. That figure represents 27 percent of all international freight through the Seaway last year. The award is a port-performance benchmark, and this year's nine-port group set a new collective record against the Seaway's own history.