On the morning of 19 January 1799, Grampus was in the Thames and under the command of Captain John Hall.
The wreck proved to be an obstacle to navigation so in April, the Commissioners of the Navy issued a call for proposals to "remove and clear the River Thames of the Wreck of His Majesty's late Ship Grampus, now on Shore on Barking-Shelf, opposite the Powder-Houses" [REF].