The coast guard said the 28,400–dwt Idship Bulker (built 2004) got stuck on 19 April on the right bank downriver from Rosario.
AIS data from Tuesday morning shows it still aground.
It had left San Lorenzo with a cargo of corn and soybean intended for Brazil.
No pollution has been reported and other ship traffic has not been affected.
The vessel is operated by Bidsted & Co.
