Kelvin Aqueduct

Kelvin Aqueduct
Carries	Forth and Clyde Canal
Crosses	River Kelvin
Characteristics
Material	Stone
Longest span	50 feet (15 m)
Number of spans	Four
History
Construction end	1787
Construction cost	GB£8,509
Opened	1790

The Kelvin Aqueduct is a navigable aqueduct in Glasgow, Scotland, which carries the Forth and Clyde Canal over the River Kelvin.

It was designed by Robert Whitworth, one of John Smeaton's supervising engineers on the Forth and Clyde Canal project. The contractors were William Gibb (founder of the engineering dynasty that led to Sir Alexander Gibb & Partners) and John Muir, who also built the nearby Maryhill locks. A foundation stone was laid on 16 June 1787 by Archibald Spiers, the chairman of the canal committee.

The entire project cost GB£8,509, exceeding the original estimated cost of GB£6,200.

When opened in 1790 was Britain's largest aqueduct, and onlookers were impressed at the sight of sailing boats crossing above them.

It was protected as a category A listed building in 1989.

The structure is in Maryhill, Glasgow.

It is 445 feet (136 m) long, with four arches of 50 feet (15 m) span, and 62 feet (19 m) high above the surface of the river. According to measurements by John Rennie as the canal was nearing completion, there was around 3 feet (0.91 m) of puddle clay at the bottom of the canal. The aqueduct was designed to carry a depth of 8 feet (2.4 m) of water.

The piers are buttressed in such a way as to resemble cutwaters, but only one pier sits in the river. The sides of the aqueduct are arched in order to transfer the outward pressure of the water onto the buttresses, an effect which can clearly be seen from above. This design feature is also present on the Luggie Aqueduct at Kirkintilloch, which opened in 1773.

The aqueduct is built from rustic masonry at the lower levels and polished ashlar above. Underneath it is the Kelvin Walkway, which runs through an area of green space around the river.

...
Wikipedia