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Harbor River Bridge â St. Helena Island, South Carolina. The Harbor River Bridge is a riveted through truss swing bridge spanning 2,851 feet over the Harbor River in Beaufort County. The bridge is part of the Sea Island Parkway (United States Highway 21) and connects St. Helena Island to Harbor Island.
The island is located in Glynn County on Georgia's coast and lies east of Brunswick (the seat of Glynn County), south of Little St. Simons Island and the Hampton River, and north of Jekyll Island. The resort community of Sea Island is separated from St. Simons on the east by the Black Banks River.