Updated Tractor Tugs Strengthen Key American Inland Waterway

of

The Mississippi River moves millions of pounds of freight annually, and for over 130 years, Bisso Towboat has been an essential part of this maritime ecosystem. Operating tugboats on the Mississippi takes more than raw power. The river's changing currents, fluctuating water levels and aging infrastructure demand vessels that combine strength with precise maneuverability. With Louisiana's extreme summer heat — where engine rooms can reach 120°F — the Mississippi River is an environment that pushes equipment to its limits.

As the operator of the largest fleet of Azimuth Stern Drive (ASD) tractor tugs serving the Mississippi’s 14,500 miles of connected waterways, Bisso Towboat understands these challenges intimately. Bisso tractor tugs escort ships between the Baton Rouge Bridge and the river's mouth, turning massive cargo vessels in tight spots and holding them steady against strong currents during loading operations. According to Dino Novic, Bisso's vice president of engineering, these vessels "turn on a dime."

Rugged Power for a Relentless River

Every 18 months, Bisso partners with Main Iron Works to modernize their fleet, replacing conventional tugs with advanced tractor models. The m.v. Mr. Brian, named after Brian Cyprowski, Bisso's vice president of operations, follows Bisso’s tradition of naming boats after team members. As the sixth ASD tractor tug built by Main Iron Works for Bisso in eight years, it isn't just another boat — it's a carefully engineered solution that enhances the company’s Mississippi River ship-assist trade service.

Louisiana Cat® also plays a valuable role in supporting Bisso, which currently uses 18 Cat engines across the fleet. When contemplating power options for the m.v. Mr. Brian, the towboat operator carefully considered horsepower requirements, river current management, load handling, maneuverability and fuel efficiency.

Bisso selected the Cat 3516E, which can maintain a continuous rating of 1566 kW (2100 hp) at 1650rpm. It stands out for its ability to operate at maximum power and speed up to 100% of the time without interruption or load cycling. Equally important, the 3516E handles Louisiana's extreme heat without the reliability issues that plague conventional engines.

Teamwork Plus Technology Equals Tenacious Tow Capabilities

What makes this project remarkable isn't just the hardware — it's the collaboration. This is Bisso’s third Cat Tier-4-powered boat. Louisiana Cat worked closely with Bisso to ensure the new Tier 4 engine integrated seamlessly with Bisso’s hull design.

“There have been situations where it’s taken my team about three hours just to clear everything out of the way to get to a certain part and that adds up to more downtime,” Novic explained. “I want to be able to get to a part quickly and do the repair within an hour. We really like our hull design and the whole interior. The living quarters, kitchen, wheelhouse, engine room—it’s all beautifully laid out so that everyone can comfortably work and live. Louisiana Cat worked with us to find the right solution for our existing hull.”

Every upgrade builds on lessons learned from previous boats, creating continuous improvement in performance, comfort and practicality. The crew gives Novic valuable information from time spent on the boats, and Novic shares that information with Main Iron Works and Louisiana Cat.

This commitment to quality ensures safety is always paramount. Novic commented, "At the end of the day, you can replace parts, but you can't replace people."

The m.v. Mr. Brian represents more than just another addition to Bisso's fleet. It embodies the evolution of Mississippi River logistics, where tradition meets technology and where strategic collaborations keep America's maritime commerce flowing smoothly.