The nineteenth century Ordnance Survey Ireland maps show that the river was much wider at that point.
The Engineer officers in charge of the operation were Lt-Colonel Thomas Colby, a long-serving Director-General of the Ordnance Survey, and Lieutenant Thomas Larcom.
•
Captain J.E. Portlock compiled extensive information on agricultural produce and natural history, particularly geology.
Ireland | Northern Ireland | Republic of Ireland | United Kingdom of Great Britain and Ireland | United States Geological Survey | Ireland national rugby union team | Ordnance Survey | Church of Ireland | New Ireland Province | Lord Lieutenant of Ireland | Lord Chancellor of Ireland | Lord Deputy of Ireland | Coast Survey | Northern Ireland national football team | National University of Ireland | High King of Ireland | All-Ireland Senior Hurling Championship | All-Ireland Senior Football Championship | League of Ireland | President of Ireland | British Geological Survey | Northern Ireland Assembly | New Ireland | Kingdom of Ireland | Lord Chief Justice of Ireland | Attorney-General for Ireland | Sloan Digital Sky Survey | Royal Army Ordnance Corps | ordnance | National University of Ireland, Galway |