Port Arthur is a city in Jefferson County within the Beaumont−Port Arthur Metropolitan Statistical Area of the U.S. state of Texas. The population was 53,818 at the 2010 census. After earlier settlements here failed, Port Arthur was founded by Arthur Stilwell in 1895, on the western bank of Sabine Lake, a saltwater estuary formed by the confluence of the Neches and Sabine rivers. It drains into the Gulf of Mexico. The city was incorporated in 1898, developed as a port, and later became the center of a large oil refinery network. The Rainbow Bridge across the Neches River connects Port Arthur to Bridge City.
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