Major South Carolina bridge closing, just 17 days projected May 5, 2021 FacebookTwitterEmail ROCK HILL, S.C. (AP) — A massive bridge repair project on one of South Carolina's busiest highways begins Thursday night and will likely cause commuting headaches for people who travel between Rock Hill and Charlotte, North Carolina. Crews will close the Interstate 77 southbound bridge over the Catawba River at 9 p.m. May 6. It will remain closed for 17 days to replace to concrete road surface on the structure, the Department of Transportation said. Southbound traffic will share the northbound bridge, and what is typically four lanes of traffic each way will be cut down to two lanes.