The Celanese Celriver Plant, once called “a miracle of modern technology,” produced synthetic yarn and fibers for clothing, synthetic flakes for making plastic household and industrial goods, and other synthetics from 1948 to 2005. The Celanese Corporation of America chose this 1,100-acre site on the Catawba River for its capacity of 100 million gallons of water a day, and the plant began operations in 1948. It had its own power plant, water purification and treatment plants, and chemical recycling. Long among the largest employers in York Co., it had an average work force of 1,600 and a peak of 2,300, and its work force was unionized, unlike most S.C. industries. At one time it was one of the largest producers of synthetic yarn in the U.S. As global demand for its products slowed, Celanese Celriver closed in 2005.