The Philip R. Clarke was the last ship through the U.S. Army Corps of Engineers' Soo Locks in Sault Ste. Marie, Michigan for the 2023-2024 navigation season on January 16, 2024.
The Clarke enters the Poe Lock from Lake Superior, lowers 21 feet in elevation in the lock chamber and heads downstream to offload a shipment of iron ore pellets at a steel mill on the lower Great Lakes.