By 1775, the first stage of deepening the river Clyde in Scotland was complete, but most shipping trade was still dependant on seaports further down stream, such as Greenock and Inverclyde, rather than the city of Glasgow further in land. At the same time, the Forth & Clyde Canal was completed and by the end of the 18th Century was a considerable success. The cutting of a canal between Glasgow and the Ayrshire coast to the south-west of the city had been considered for some years and in 1805 an Act of parliament approved the canal.
The canal was laid out by the civil engineer Thomas Telford (1757-1834) and was to run thirty one and a quarter miles (50 Km) from Tradeston, Glasgow, to Ardrossan on the north Ayrshire coast through the counties of Renfrewshire and Ayrshire via Paisley, Johnstone, Dalry and Kilwinning. Thirty feet wide and four and a half feet deep, it would not only bring cargoes from the seaport at Ardrossan to Port Eglinton in Glasgow, but also attract trade from the coalfields along its length.
Although the money ran out at Johnstone, the completed part of the canal, which was opened in 1810, operated successfully for many years. The express passenger boats in 1836 carried 420,000 people between Paisley and Glasgow. It was finally made obsolete by the expansion of the railway system and in 1885 the channel was infilled. A railway now follows its path.