Dundas Aqueduct

About

Dundas Aqueduct (grid reference ST785625) is an aqueduct in England which carries the Kennet and Avon Canal over the River Avon (the Somerset / Wiltshire border) and the Wessex Main Line railway. The aqueduct is near Monkton Combe, Somerset, and is about 2+1⁄2 miles (4 km) south-east of the city of Bath. It was designed by John Rennie and chief engineer John Thomas between 1797 and 1801, and completed in 1805.

James McIlquham was appointed contractor. It is named after Charles Dundas, the first chairman of the Kennet and Avon Canal Company. The aqueduct is 150 feet (45.7 m) long with three arches built of Bath stone, with Doric pilasters, and balustrades at each end.

The central semicircular arch spans 64 feet (19.5 m), and the two oval side arches span 20 feet (6.1 m). The canal crosses back across the Avon and the railway on another aqueduct at Avoncliff. This diversion onto the right bank of the Avon avoids the steep sides of the river valley at Limpley Stoke, and the need to cross the Midford Brook and River Frome.

The aquecuct is a Grade I listed structure, and was the first canal structure to be designated as a scheduled monument in 1951. Over many years, leaks had developed and...