Ride the Ducks is owned by Herschend Family Entertainment, which is based near Atlanta and operates Camden's Adventure Aquarium and the Dollywood theme park.
The ducks can carry 37 passengers and two crew members, said Sharla Feldscher, a local spokeswoman for Ride the Ducks.
"We're doing everything we can for the passengers and our guests," she said.
Ride the Ducks has canceled all tours for Thursday.
In 1999 a failed drivetrain seal caused the drowning deaths of 13 tourists, including three children, when a World War II military surplus amphibious vehicle sank in Lake Hamilton, Ark.