wide canal in contradistinction to some northern narrowboat canals, so that the troughs had to be substantially larger and stronger than elsewhere. The cast iron units were cast at the Ketley foundry at Coalbrookdale; the company had already been involved with Telford on the Longdon-on-Tern Aqueduct. They were transported to Cosgrove by the canal itself, and assembled and erected at site. The new structure was completed in January 1811. Structural details To resist the substantial additional loading of a wide canal, Bevan designed the floor sections to be arched, providing additional strength; in addition there are arch ribs built in with the trough side plates to give additional shear strength The towpath is cantilevered from one side, as at Froncysyllte, and supported by diagonal struts. There is a cattle creep in the embankment either side of the main structure, which is used by pedestrians. See also Canals of the United Kingdom History of the British canal system References Labrum, E A, Civil Engineering Heritage, Eastern and Central England, Thomas Telford (1994). Lewis, Peter R., Disaster on the Dee: Robert Stephenson's Nemesis of 1847, Tempus (2007). External links A location map of several famous cast iron aqueducts A brief description Milton Keynes and the aqueduct Bridges completed in 1805 Bridges in Buckinghamshire Transport in Buckinghamshire Transport in Milton Keynes Transport in Northamptonshire Navigable aqueducts in England 1805 establishments in England Cast iron aqueducts