Workers dug up a cannon ball at 58 Coming Street at about 5:20 p.m., Charles Francis, spokesperson with the Charleston Police Department, said.
The incident caused some closures near the College of Charleston campus.
The Charleston Air Force Base Explosive Ordnance Disposal unit removed the cannonball, according to an update from the police department.
The far right lane of Coming Street between Calhoun and Bull Streets remained closed down until about 9 p.m., when the College of Charleston reported all roads were open. All other streets were reopened within an hour of the police department's initial report.
It is not unusual to find Civil War-era munitions on the peninsula, Lt. Jim Byrne with the Charleston Police Department's Explosive Device Unit told the Post & Courier in 2014.
Construction crews found an artillery shell that likely had been buried since the Civil War era at the College of Charleston in late November of 2014.
That shell could still have posed a threat, Byrne said at the time. Authorities cordoned the property and evacuated nearby buildings.
All unearthed shells rightfully belong to the military.