The ship manager told KHOU-TV, Houston, crewmembers began to notice leaking Saturday. Since then, crews have been working to pump water out of the lower deck.
Texas Parks and Wildlife has expressed concern the ship may leak oil into the channel, so a boom has been set up to capture any runoff. Officials said they hope to have the leak repaired by Wednesday.
"We're dealing with a 100-year-old vessel … so you're dealing with something that wasn't designed to last this long," said ship manager Andy Smith. "We think we can probably manage a patch, a repair on it, but this is always a concern that this could sprout up again in a different place."
In the mean time, the ship's top two decks are still open to the public while the bottom deck is closed off.
"We got a lot of hoses working and pumps working, and we don't want to create a situation where someone might slip on some water," Smith said.
The first ship to be declared a U.S. landmark, the WWII-era USS Texas was permanently docked at the Houston Ship Channel at San Jacinto in 1947 following its decommission and made into a museum ship.