Map of the river from Grondines to Bastican, 1859
River St. Lawrence, above Quebec, sheet IV [cartographic material] : Grondine to Batiscan / surveyed by Captn. H.W. Bayfield, Commr. J. Orlebar, Lieut. Hancock, E.A. Carey, & W.T. Clifton Mastr. R.N. & Mr. Desbrisay R.N., 1859.
Source: Library and Archives Canada (R11630-2078-3-E).
This map of the river, published in England on November 20, 1860, shows that the Grondines wharf to the east of the mill already existed at that time.