The City is the port authority for the Port of Marinette. The Port of Marinette has a shipping harbor and channel with a depth of 8.5 meters (28 feet). There are two 50-ton capacity cranes available in the Port of Marinette, which is open from April through December.
The Marinette Marine Corporation (MMC) owns and operates the shipyard and their own dock in the Port of Marinette to moor vessels for outfitting and repair. The shipbuilding plant produces military and commercial vessels. This Port of Marinette dock has berthing distance of 327.1 meters (1073 feet) with alongside depths of 4.3 and 6.4 meters (14 and 21 feet). A surface rail track connects the plant at the rear of the dock with the Union Pacific Railroad.
Marinette Marine built its first five wooden barges after it opened in 1942. Since then, it has become a well-established shipbuilder that has designed and created over 1500 vessels. The shipyard is still growing, and it is a vital part of the Port of Marinette economy. It has 135.9 hectares of manufacturing, receiving, and warehouse space. It uses state-of-the-art automated manufacturing equipment. MMC employs some of the industry's best nautical engineers and architects as well as a skilled workforce.
Known for its efficient modular, subassembly, and assembly-line manufacturing techniques, MMC produces some of the world's most technologically advanced vessels in the Port of Marinette. Owned by Fincantieri, one of Europe's biggest shipbuilders, MMC built the US Navy's Littoral Combat Ship, its Lighterage System, ocean tugs, and mine countermeasure vessels. It has built buoy tenders, icebreakers, and response vessels for the US Coast Guard.
The Marinette Fuel & Dock Company docks receive dry bulk commodities like salt, coal, limestone, lime, and pig iron a their dock in the Port of Marinette. The dock has two berthing stations. The first has berthing distance of 853.4 meters (2800 feet) with alongside depth of 6.7 meters (22 feet), and the second has berthing distance of 213.4 meters (700 feet) with alongside depth of 4.3 meters (16 feet). The open storage area at the rear of this Port of Marinette dock can accommodate 150 thousand tons of material.
Ansul Fire Protection owns and operates the Port of Marinette Coal Dock to receive coal by self-unloading vessel. With berthing distance of 182.9 meters (600 feet) and alongside depth of 5.8 meters (19 feet), the dock has an open storage area with capacity for eight thousand tons of coal. A surface rail track connects the plant at the rear of this Port of Marinette dock with the Union Pacific Railroad.
K & K Warehousing owns and operates the Port of Marinette's Menominee Wharf to ship and receive wood pulp. The wharf has berthing distance of 182.9 meters (600 feet) with alongside depth of 7.6 meters (25 feet). A metal-covered warehouse at the rear of this Port of Marinette wharf offers 2.8 hectares for storage of wood pulp and other commodities. One rail track inside the warehouse connects to the Union Pacific Railroad and the Escanaba & Lake Superior Railroad.
The Menominee Paper Company owns and operates the Coal Dock in the Port of Marinette to receive coal for consumption at its plant. The dock has berthing distance of 167.6 meters (550 feet) with alongside depth of 5.5 meters (18 feet). The open storage area at the rear of the dock can accommodate about 60 thousand tons of coal, and the plant rail track connects with the Union Pacific Railroad.
There are two marinas in the Port of Marinette. Nestegg Marine is open from May 1st through October 1st on Monday through Friday from 8am until 5pm. On weekends, it is open until 7pm. It offers seasonal and transient dockage that includes water and electricity. In 2011, the Port of Marinette's Nest Egg Marine's marina was named the Best Small Marina in the US by Marina Dock Age, a magazine dedicated to boatyard and marina management. This Wisconsin Clean Marina in the Port of Marinette has gas and diesel, ice, and a pump-out station as well as restrooms and showers. The Captain's Quarters has amenities that include a washer and dryer, a microwave, coffee maker, courtesy phone, cable TV, and comfortable seating where guests can host social events. The marina has a dog park and a shuttle to the local airport and shopping. The grounds contain barbecue and charcoal grills and campfire, and there is a dinghy storage rack in this Port of Marinette marina. Harbor Town Marine is located on East Russell Street in the Port of Marinette. It offers gas and diesel fuel, a pump-out station, restrooms and showers, and groceries.