The U.S. 17 and Main Road improvement project in Charleston County, South Carolina, funded by the 2016 transportation sales tax, aims to ease traffic with flyover ramps, a Main Road spur bridge over U.S. 17, roadway widening, a roundabout at Main and River Roads, bike/pedestrian paths, and stormwater upgrades. Engineering manager Herbert Nimz notes the team is minimizing daily impacts amid resident complaints about noise.
Current Status
- Pile driving for north/southbound interchange ramps: 45% complete, expected to wrap up by April (loud banging will pause overnight).
- On track for 2028 completion.
Next Few Months
- Utility relocations.
- Design work for bridge ramps, CSX Railroad Bridge, and U.S. 17 overpass.
- Continued pile driving for ramps.
- Earthwork for ramps.
- Start Main/River/Chisolm Road roundabout construction (chosen for best traffic flow).
Nimz expects a “blur of activity” this summer with visible progress.
Long-Term Timeline
| Year | Key Activities |
|---|---|
| 2026 | Utility relocations (water, sewer, power, comms); complete earthwork for ramps 2/3; pile driving/drilled shafts for all ramps, roundabout, drainage; finish Ramp 3; start U.S. 17 overpass and CSX Bridge; drainage and traffic signals. |
| 2027 | Finish drainage; continue U.S. 17 overpass (earthwork/bridge) and CSX Bridge. |
| 2028 | Complete U.S. 17 overpass, CSX Bridge, traffic signals/timings; pave final surfaces and markings. |
Quarterly public meetings will provide updates. Nimz urges patience, calling it a vital regional project. For latest details, check Charleston County Public Works site.
Interested in similar infrastructure updates from other SC counties?
