River Tay Dochart until it flows into Loch Tay at Killin. The River Tay emerges from Loch Tay at Kenmore, and flows from there to Perth which, in historical times, was its lowest bridging point. Below Perth the river becomes tidal and enters the Firth of Tay. The largest city on the river, Dundee, lies on the north bank of the Firth. On reaching the North Sea, the River Tay has flowed from west to east across central Scotland. The Tay is unusual amongst Scottish rivers in having several major tributaries, notably the Earn, the Isla, the River Tummel, the Almond and
Tay Bridge disaster anomalously high because of peculiarities of the site (one of the highest points on the Wirral.<ref name="The Wirral Hundred/The Wirral Peninsula"></ref>): a wind pressure of would overturn railway carriages and such events were a rarity. (To give a subsequent, well documented example, in 1903 a stationary train "was" overturned on the Levens viaduct but this was by a 'terrific gale' measured at Barrow in Furness to have an average velocity of , estimated to be gusting up to .) A new double-track Tay Bridge was built by the NBR, designed by Barlow and built by William Arrol & Co. of