A case can be made for declaring that the Grand Canal in Offaly is the county’s greatest building. No other structure has contributed so much to the economic development of so many of its towns and villages over the last 230 years. In addition, it has supported the recreational wellbeing of local citizens for a hundred years or more and seems set to do so exponentially in the decades ahead. It also preserves a relatively undisturbed wildlife corridor for many of our threatened flora and fauna species. The canal has its own rich cultural identity, much celebrated in literature and music. Its components, listed below, still combine to create an architectural entity that is almost fully operational although in a fashion undreamt of when it was first conceived in 1715, well over 300 years ago.
Combining the Shannon or Main Line (1793–1804) and the Kilbeggan Branch (1830–35), the stretches of the canal in Offaly and Westmeath took just over fifteen years to build. As it flows forty-four miles from Cloncannon, south-east of Edenderry, to Bunbrosna and Minus, downstream of Shannon Harbour, and eight miles along the Kilbeggan Line, its architectural components present a staggering list: it tumbles through sixteen locks; crosses five large aqueducts; supports and reflects forty or so ancient and modern bridges; funnels into its own channel an array of supplies or feeders, kept in control by a strategically placed system of overflows or overspills; conducts scores of unwanted streams, syphoned and otherwise, through scores of tunnels or culverts, under its non-porous bed to nearby rivers and gently glides along between a hundred miles of well-staunched towpaths and embankments to a seamless confluence with the brimming Brosna and the Lordly Shannon.
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