The A813 is a short A-road in Dunbartonshire, running parallel to the A82 through Alexandria.
Dumbarton - Balloch
At its southern end the road used to commence at Barloan Toll (sometimes known as Bellsmyre Roundabout); however, it now starts at the new Lomondgate Roundabout junction with the A82 a little further west. Heading north as Stirling Road it passes the Bellsmyre housing estate before leaving Dumbarton and broadly following the course of the River Leven, passing the Strathleven Industrial Estate and the large housing estates of Redburn, O'Hare, Pappert, Braehead, and Beechwood before entering the town of Bonhill as Main Street. Continuing north past the Bonhill Bridge, the road passes Napierston and goes through Jamestown, becoming Carrochan Road, before ending at a roundabout junction with the A811 in Balloch, close to Balloch Bus Station.
The previous route of the A813
The A813 used to run north of Balloch to meet the A82 rather than east. It has essentially swapped numbers with the A811 upon the opening of the western flank of the A82 Alexandria Bypass. The original route, in 1922, was along Drymen Road and then Balloch Road, crossing Balloch Bridge. However, with the opening of Lomond Bridge in 1934, the A813 was rerouted along Lomond Road immediately to the south, and the original route became the B854, albeit with the connecting link along the northern end of Carrochan Road being an unlikely spur of the A813.
For more information on the history of the A813, see the A82/Great Western Road page, as the two routes have been inextricably linked.