The Great Lakes Tug Fleet Is Getting Younger
Great Lakes Towing had barely finished a decade-long, ten-tug modernization program when it ordered two more ice-class harbor tugs. Behind Hulls 11 and 12 is a much bigger story about aging U.S. towboats, brutal winter operations, compact vessel design and the economics of building proven foreign designs in American shipyards.
A month ago, this story looked finished. Great Lakes Towing had christened Puerto Rico, the tenth and supposedly final tug in a fleet-renewal program stretching back to 2016. Then the company went back to its own Cleveland shipyard and ordered two more. That changes the meaning of the program. What began as replacement of extremely old harbor tugs is becoming something broader: a long-term bet on standardized, ice-capable towage throughout one of North America’s most demanding inland marine systems.
The ten-tug program just became twelve
Great Lakes Towing Company announced in late September that Great Lakes Shipyard will construct Hulls 11 and 12 in its Damen newbuild series. Construction is expected to begin later in 2026. Hull 11 is scheduled for delivery in late 2027 and Hull 12 in early 2028.
The original finish line had already been crossed.
Puerto Rico, christened in Cleveland in May 2026, completed the original series of ten Stan Tug 1907 ICE vessels. As recently as August, it was being described publicly as the tenth and final tug in that particular renewal program.
The new order therefore does more than keep a production line alive. Great Lakes Towing itself describes the next phase as both fleet renewal and expansion.
That makes the order a useful indicator of management’s confidence in future Great Lakes commercial shipping rather than simply the final cleanup of an old fleet.
This is the key number in the entire story. The company had completed the original ten-tug modernization campaign. Ordering two additional vessels immediately afterward suggests that the business case for the design survived nearly a decade of real-world operation strongly enough to justify another round of capital spending.
A renewal program that refused to end
Great Lakes Shipyard begins construction of a ten-vessel Stan Tug 1907 ICE series under a technical-cooperation and licensing arrangement with Damen.
The first vessel immediately begins Great Lakes harbor-assist work and establishes the basic platform for the series.
Ohio, Michigan, Pennsylvania and Wisconsin help move the fleet away from its legacy single-screw tug era and toward a standardized newbuild class.
Great Lakes Towing marks its 125th anniversary with another modern ice-class tug.
The original ten-vessel program approaches completion.
Hull 10 completes what had been presented as the decade-long renewal series.
Instead of closing the program, Great Lakes Towing extends it into 2028.
On the Great Lakes, smaller can actually be more useful
Compared with today’s 80- and 90-tonne escort tugs operating around large coastal container and LNG terminals, the Stan Tug 1907 ICE can look modest. That misses the point. Great Lakes harbor towing demands a different tool.
A compact tug built around constrained waterways
The established Great Lakes vessels are approximately 19.5 metres — about 64 feet — long and produce around 30 tonnes of bollard pull.
Their short length, shallow dimensions and high maneuverability are useful around narrow river reaches, harbor basins and bridge-constrained waterways where a bigger, wider coastal escort tug can actually become less convenient.
Exact machinery specifications for Hulls 11 and 12 have not yet been publicly detailed, so prior-series specifications should be treated as a reference rather than a guaranteed final equipment list.
“Ice-class tug” is not marketing language on these lakes
Winter capability is central to the operating case. Great Lakes towing does not stop being necessary when temperatures fall. Commercial vessels still need harbor assistance, channels need to stay usable and tugs may have to work directly in surface ice.
More hull protection
The Great Lakes versions use additional steel thickness and reinforcement in areas exposed to ice contact.
Heavy fendering
Robust fender systems protect the tug during close ship-assist work and contact in difficult winter conditions.
Compact dimensions
A small footprint helps in tight harbor environments where ice can reduce already limited maneuvering room.
Independent mobility
An ice-capable harbor tug can continue providing local assistance even when conditions make ordinary harbor craft less effective.
The most recent winter proved the point.
The U.S. Coast Guard described the 2025–26 season as severe, with Great Lakes icebreaking continuing into the spring. Following the reopening of the Soo Locks, U.S. and Canadian Coast Guard assets were repeatedly required to assist commercial vessels through ice in the St. Marys River and upper Lakes. A new tug ordered in 2026 therefore enters a market that has just been reminded how operationally significant winter capability can be.
America’s towing fleet is old — even by marine-industry standards
U.S. inspected towing vessels are the oldest inspected commercial category.
The Coast Guard’s 2024 Flag State Control data counted 4,927 inspected towing vessels and placed their average age at approximately 35 years. That was the highest average among inspected commercial vessel types.
Great Lakes Towing’s situation has historically been even more unusual. Its famous “G-tug” fleet included vessels that remained productive for many decades. Industry reporting in 2020 noted that some of the tugs being replaced had already operated for at least 50 years.
That is not evidence that old tugs are inherently unsafe. Marine steel can be renewed, engines repowered, machinery replaced and vessels inspected repeatedly. A 50-year-old working tug may contain very little of its original machinery. But age changes the economics.
Maintenance becomes less predictable
Older machinery, piping, electrical systems and steel can generate increasingly variable repair requirements.
Crewing becomes harder to standardize
A fleet built across many eras can mean different controls, engines, spare parts and operating procedures from tug to tug.
Compliance costs matter
Modern inspection, safety-management and Subchapter M requirements can make replacement more attractive than continued reinvestment in certain legacy hulls.
Designed in the Netherlands. Built in Cleveland. That combination matters.
The Great Lakes program is a useful case study in how American operators can use a proven international design while satisfying domestic coastwise requirements.
| Piece of the model | What Great Lakes Towing gets | Why it matters economically |
|---|---|---|
| Damen design | A platform refined through international production and operating experience | Less design uncertainty than starting every vessel from a blank sheet |
| U.S. licensed construction | Great Lakes Shipyard builds the design in Cleveland | Allows the vessel to fit the U.S. coastwise operating framework |
| Repeat series | The yard has already built ten examples | Workers know the vessel, tooling and production sequence |
| Standardized fleet | Similar vessels, equipment and operating characteristics | Potential advantages in training, spares, maintenance and crew familiarity |
| Sister companies | Owner and builder sit inside the same broader corporate group | Operational feedback can move directly from towing crews to the yard |
The learning curve may now be one of the program’s most valuable assets. Great Lakes Shipyard has already worked through the process of adapting the Damen platform to U.S. practices and regulations. Hulls 11 and 12 therefore start with accumulated yard knowledge that did not exist when Cleveland was built.
The first ten also tested a practical middle ground
Previous vessels in the series have used Logan FlexaDrive/FlexaGen hybrid equipment that allows electric operation at idle, low speed or low load without relying continuously on the main propulsion engines.
Great Lakes Towing reported during the earlier phase of the program that it was seeing fuel savings in the 30%–50% range in its application, while also reducing main-engine wear. That claim should not be treated as a universal fuel-saving figure for all tugs: the company itself emphasized that hybrid performance depends heavily on duty cycle.
A harbor tug spends a lot of time not using full horsepower.
A tug may idle, wait for a vessel, reposition slowly, deliver a short burst of power, work an assist and then return to low load.
Running large diesels continuously during those low-demand periods can be inefficient. Hybrid systems can therefore target the exact part of the duty cycle where conventional propulsion is least efficient.
Because the Great Lakes are not a small maritime market
More than 90 million tons of cargo move annually aboard the U.S.-flag Great Lakes fleet, including iron ore, limestone, coal, cement, salt, sand and grain. Across the wider U.S.-Canadian Great Lakes system, the waterways support a major industrial region centered on steel, mining, agriculture, energy and manufacturing.
The investment does not necessarily mean management expects a dramatic cargo boom. It says something more conservative—and perhaps more important: Great Lakes Towing expects enough long-term ship-assist and harbor work to justify continuing a newbuild program that had already reached its original completion point.
Six questions Hulls 11 and 12 should answer
Watch for the final engine and hybrid-system specification. Machinery has varied within the broader series, so the new contract equipment should not be assumed yet.
The company’s wording includes both. Which legacy vessels leave service when the new tugs arrive will show how much is true fleet growth.
The assigned ports will reveal where Great Lakes Towing sees the strongest demand for modern ice-capable harbor assistance.
Hull 10 was once the endpoint. If 11 and 12 perform well and more legacy tugs remain economical replacement candidates, twelve may not be the final number.
The difficult 2025–26 season may influence decisions around steel reinforcement, propulsion redundancy, heating and winterization.
A dozen repeat builds give Great Lakes Shipyard unusually deep U.S. experience with this Damen platform, potentially strengthening the case for third-party sales.
This is not really a story about two tugboats.
It is a story about what happens when an operator with an unusually old fleet finds a replacement formula that works. Great Lakes Towing began the program because century-old maritime traditions eventually collide with modern inspection rules, operating costs, emissions expectations and customer demands. Ten standardized ice-class newbuilds appeared to be enough. Then management ordered two more. That may be the clearest endorsement of the program yet.
What can newbuilds do to an aging fleet?
Run a simple scenario using any fleet size and legacy-vessel age. This does not represent Great Lakes Towing’s exact current fleet mix; it illustrates why replacing even part of an old tug fleet can materially change its age profile.
Research base
Research for this report included Great Lakes Towing Company and Great Lakes Shipyard announcements; Damen Shipyards technical and licensing information; Riviera Maritime Media; WorkBoat; Marine Log; U.S. Coast Guard domestic fleet and icebreaking information; U.S. Code coastwise-towing and vessel-documentation provisions; Lake Carriers’ Association Great Lakes shipping and icebreaking information; and American Waterways Operators reporting on Coast Guard towing-vessel fleet data. Information reviewed through October 5, 2026.
