Hampden Bridge, Allan truss road bridge in Wagga Wagga, Australia

Hampden Bridge was a timber Allan truss road bridge over the Murrumbidgee River at Wagga Wagga, 330 feet (100.6 m) long in three truss spans of 110 feet (33.5 m) each. It was the first large overhead-braced truss designed by Percy Allan, built in timber after steel tenders proved too costly. It was demolished in 2014.

The Hampden Bridge opened on 11 November 1895, replacing a toll bridge run by the Wagga Wagga Bridge Company between 1862 and 1895. Designed by Percy Allan as his first large overhead-braced truss, it was meant to be steel but was built in timber because tenders were too costly. It carried the Olympic Highway from 1963 until October 1995, closed to pedestrians in 2006 after a truss failed, and was demolished with explosives on 20 August 2014.

The bridge represents a milestone in Australian engineering, demonstrating the technical capabilities of Percy Allan through its efficient truss design.

The bridge no longer exists: it was demolished by controlled collapse with explosives on 20 August 2014, and only its concrete pylons were left standing in the Murrumbidgee River. Visitors today see those piers, one with a large circular opening, from the riverbanks and from the nearby Wiradjuri Bridge, which replaced it on a similar alignment.

The Hampden Bridge was demolished with explosives on 20 August 2014, but its concrete pylons were left standing in the Murrumbidgee River. The bridge had three timber truss spans of 110 feet each, not twelve iron spans, and was designed by Percy Allan as the first large overhead-braced truss of his career.