Thames Aqueduct
The navigation of these first few miles of the Thames was long ago considered to be so irretrievably a thing of the past, that it was permitted the constructors of the North Wilts Canal, in crossing the stream, one mile above Cricklade, to build a brick bridge or aqueduct so low-pitched across it that the crown of the arch scarcely appears above water, and effectually stops any attempt to get even a canoe through.
Thames Valley Villages1910
Thames aqueduct 1897