The Port of Alliance is an unincorporated area about 35 river miles (28 kilometers or 17 miles by air) south-southeast of New Orleans. It is part of the Mississippi River System.

For thousands of years, the indigenous Chitimacha people inhabited the Southern Louisiana area that would become the Port of Alliance. In the early 18th Century, Frenchmen and their Acolapissa allies began raiding Chitimacha lands to get slaves. These actions resulted in a 12-year-long war that devastated the Chitimacha people. The Chitimacha Tribe is the only indigenous tribe that has retained a part of their original homelands. Today, some 950 Native Americans live on the Chitimacha Reservation.

Conoco Phillips's Phillips 66 Company owns and operates several wharves in the Port of Alliance. In addition, Cenex Harvest States Cooperatives owns and operates the Port of Alliance's Myrtle Grove Terminal to receive grain by barge and to ship grain by vessel and barge. Rail tracks at the rear of the wharf serve a 100-car capacity storage yard and connect with the Lower Coast Railroad and the Union Pacific Railroad.

The Port of Alliance's Myrtle Grove Terminal has berthing space for almost 70 loaded barges below the wharf on 13 anchor buoys and 17 empty barges above the wharf. A grain elevator at the rear of the terminal has capacity for 6.5 million bushels. The Port of Alliance's Myrtle Grove Terminal has berthing space of 241 meters (790 feet) with alongside depth of 12.2 meters (40 feet) MLG.

The Phillips 66 Company operates the Port of Alliance Refinery Coke Wharf to ship petroleum coke by barge. Pumps at the wharf provide refinery process water, and there is a discharge pipeline for treated wastewater on the Refinery Coke Wharf. This Port of Alliance Wharf has rail tracks serving the refinery at the rear of the wharf that connect with the Lower Coast Railroad and the Union Pacific Railroad. The Port of Alliance's Refinery Coke Wharf has berthing space of 225 meters (740 feet) with alongside depth of 12.2 meters (40 feet) MLG.

The Phillips 66 Company also operates the Port of Alliance Refinery Fleeting Wharf to moor tugboats and barges. Four breasting dolphins that front the riverbank provide an additional 650 feet of berthing space for barges. The Port of Alliance Refinery Fleeting Wharf has berthing space of 61 meters (200 feet) with alongside depth of 12.2 meters (40 feet) MLG.

Conoco Philllip's Phillips 66 Company also operates the Port of Alliance Refinery Tanker Docks No. 1 and No. 2. Refinery Tanker Dock No. 1 in the Port of Alliance is used to receive crude oil and to ship and receive petroleum products, butane, and liquefied propane gas. The Port of Alliance's Refinery Tanker Dock No. 1 has berthing space of 402 meters (1320 feet) with alongside depth of 18.3 meters (60 feet) MLG.

The Port of Alliance Refinery Tanker Dock No. 1 is equipped with eight pipelines connecting the wharf to 46 storage tanks with total capacity for over 5 million barrels. A pipeline for liquefied petroleum gas connects to four storage tanks with total capacity of 90 thousand barrels. A propylene pipeline connects the wharf to a propylene sphere with capacity for 40 thousand barrels. A butane pipeline reaches to six butane storage tanks with total capacity for 12.6 million gallons.

The Port of Alliance Refinery Tanker Dock No. 2 operated by Phillips 66 Company is used to receive intermediate-feed crude oil and to ship petroleum products. Tanker Dock No. 2 is designed to accommodate a tanker as large as 130 thousand DWT. The wharf's superstructure supports pipeline galleries, hose-handling mechanisms, manifolds, firefighting equipment, and control valves. Ten pipelines extend from the Port of Alliance Refinery Tanker Dock No. 2 to the same storage tanks described above. Refinery Tanker Dock No. 2 has berthing space of 299 meters (982 feet) with alongside depth of 21.3 meters (70 feet) MLG.

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