The ship was on its way from Mazagan (now called El Jadida) in Morocco, to Lancaster carrying Indian corn when it was wrecked. Imperatriz sailed 24th May 1866 from Falmouth to Lancaster on the last leg of its journey.
The wrecking happened on Saturday June 2nd, 1866. The accident occurred whilst the Imperatriz was being towed up the River Lune by a steam tug and ran aground on the riverbed a few hundred yards from New Quay. Salvageable items of the wreck were auctioned by W.M. Stewardson at New Quay, Lancaster on Monday 25th June 1866 raising a total of £166.00.
but if you look on google maps
it is hardly visible, with just the stern and bow managing to poke out of the mud. but now the mud has shifted we get this strange but interesting sighting.
and the video is in this post.