US Steel's biggest manufacturing plant, Gary Works, is located on the south shores of Lake Michigan. Gary Works has both steel-making and -finishing facilities, and it can produce up to 7.5 million net tons of raw steel every year. US Steel and the Gary Works are the de facto port authority for the Port of Gary. US Steel renamed itself to USX Corporation in 1991. In 1982, it acquired Marathon Oil. Then in 2001, USX became a separate company, becoming Marathon Oil.
USX Corporation owns and operates the Gary Works East Dock in the Port of Gary to receive limestone and dolomite by self-unloading vessel and to ship scrap metal and products from the steel mill. Four surface rail tracks at the rear of this Port of Gary dock connect with plant tracks and with the Elgin, Joliet, and Eastern Railway.
At the inner end of the slip is a 228-meter (750-foot) wide turning basin. There is also an open storage area with capacity for about 500 thousand tons of materials. This Port of Gary dock has berthing space of 1326 meters (4352 feet) with alongside depth of 8.2 meters (27 feet) LWD.
USX Corporation also owns and operates the Gary Works West Dock in the Port of Gary where it receives iron ore, limestone, and iron ore pellets by self-unloading vessel. Rail tracks in the rear of the dock connect with the Elgin, Joliet, and Eastern Railway. Bins at the rear of this Port of Gary dock have capacity for 2.7 million tons of ore, 910 thousand tons of ore pellets, and 250 tons of stone. The operator maintains an 8.2 meter (27 foot) deep private channel that reaches deep water in Lake Michigan. The Port of Gary's West Dock has berthing space of 1609 meters (5280 feet) with alongside depth of 8.2 meters (27 feet) LWD.
Lehigh Portland Cement Company owns and operates the Port of Gary's Buffington Harbor Dock to receive limestone, cement clinker, bauxite, and a variety of bulk materials by self-unloading vessel. This Port of Gary dock is also used to ship dry bulk cargoes like slag and coke. The plant at the rear of the dock makes specialty cements, and there is an open storage area at the rear of this Port of Gary dock with capacity for about one million tons of limestone and 200 thousand tons of bauxite. The Port of Gary's Buffington Harbor Dock has berthing space of 649 meters (2128 feet) with alongside depth of 6.1 meters (20 feet) LWD.