Tunks Creek bridge, Galston, Historic timber truss bridge in Galston, Australia

Tunks Creek Bridge is a single-span timber McDonald truss bridge on Galston Road, crossing Tunks Creek in Galston Gorge east of Hornsby. Built in 1893–94, its 20-metre span is the shortest among New South Wales's remaining timber truss bridges. The deck is 5 metres wide between kerbs, and both approach roads turn at right angles.

Tenders for the Pearces Creek Bridge and the nearby Berowra Creek Bridge were called on 5 August 1892; thirteen were received and Francis Boland won with the lowest bid of just over £2,651. Work began in February 1893 and was finished by early 1894, partly as a depression relief scheme providing work for the poor. The road it served, built to shorten the distance to market for Galston fruit growers, was not completed until 1895.

Locals call it Pearces Creek Bridge, after the creek's earlier name, and the 1892 contract went to Francis Boland, whose bid of just over £2,651 was the lowest of thirteen tenders. Work began in February 1893 and finished in early 1894, partly as a depression relief scheme giving work to the poor.

The bridge carries a single lane, with give-way signs at both ends so traffic already on the span has priority. Galston Road through the gorge is winding and has a load limit, and the approach road turns sharply at right angles at each end, so drivers must slow down before entering.

Of the 91 McDonald truss bridges built in New South Wales, only five remained as of April 2019, and this 20-metre span is the shortest of them. It was built for A£265 under a contract won by Francis Boland, whose tender of just over £2,651 was the lowest of thirteen received.