Edna G. Hull & Mooring Study

Location: 
Two Harbors, MN
Completed: 
2016
·1896 Historic Tugboat
· Last Steam Powered Tug on
Lake Superior
· Decommissioned in 1981
· 1000HP Steam Engine
· 200FT Pile-supported Dock
 
AMI Consulting Engineers, PA was contracted by the Lake County Historical Society to perform detailed inspections on the Edna G. Tugboat and surrounding structures to assess the current condition of the vessel and aide in the long-term storage and restoration options. The thickness of the entire vessel hull and other critical locations were measured in a detailed grid pattern by one of AMI’s structural engineer divers with a specialized underwater ultrasonic thickness gauge. Visual inspections of the vessel hull, dock structure, and mooring dolphin were also performed by the diver. All dives performed by AMI were recorded for further review and given to the client for their records. AMI also performed detailed inspections and tests on the small air tanks aboard the vessel to determine if they could safely remain in service. The dock structure was also analyzed to provide a load rating to the client.
Upon completion of the inspections and analysis, AMI compiled a report detailing the inspection findings, any issues or repairs that were needed, and recommendations for further maintenance and long-term storage of the vessel. These findings and recommendations were presented to the Edna G Committee to aide in their decision on the long-term storage of the vessel and maintaining the historical vessel for future generations.
Once approved, AMI prepared detailed repair plans and specifications, prepared cost estimates and scheduled all repairs. During the repairs, additional interior bilge compartments needed to be inspected, repaired and coated to prevent further degradation to this historic vessel. AMI performed complete oversight of all repairs that included steel patching, coating and installation of protective anodes to the entire hull, shafts and propeller. Completed in November 2016.