Fort Sumter in Charleston Harbor remains filled with 3 feet of water from Tropical Storm Irma's rains and tidal surge, the National Park Service said Tuesday afternoon.
There was some damage to the fort's docking pier and to some of the interior facilities but no artifacts appear to be harmed.
It will be several days before the fort will be open to the public, said Dawn H. Davis, public affairs officer for Fort Sumter National Monument and the Charles Pinckney National Historical Site.
"It will just take time," she said of the water inside having to drain.
The overflow will go into Charleston Harbor.
The Charles Pinckney site in Mount Pleasant, and Fort Moultrie on Sullivan's Island, will reopen to the public starting Thursday.
The Liberty Square visitor center in Charleston and its departure point for Fort Sumter will remain closed until a damage assessment and repairs are completed.