Galston Gorge is a valley located in the Berowra Valley Regional Park in Sydney, Australia. It separates Galston from Hornsby Heights, and is intersected by Galston Road and the heritage-listed Tunks Creek Bridge at the foot of the valley. Adjacent to Tunks Creek Bridge, there is a second concrete bridge that crosses Berowra Creek. The gorge itself contains many walking tracks, waterfalls and a variety of Australian flora, and is an area frequented by hikers, cyclists and rock climbers. Description Galston Gorge is a valley containing dense bushland with numerous natural features such as waterfalls and streams accessible by established walking tracks. At the foot of the valley, Tunks Creek Bridge crosses Tunks Creek. The bridge was constructed in 1893 as a McDonald timber truss one-way road bridge, and became heritage listed in 2000 under the 1977 Heritage Act. The second bridge, the Steel Military Bridge, is a Warren truss bridge that crosses Berowra Creek. It was installed in 1965 to provide fire-fighting vehicles with access between Hornsby and Dural. There is also a small car park located near the base of the Gorge which contains three designated car spots and the Galston Gorge track head that allows access to sections of the Great North Walk. Galston Road allows direct access between Galston and Hornsby Heights, and is the only road that extends through the entirety of Galston Gorge. Via the Gorge, travelling from Galston to Hornsby Heights takes approximately 20 to 25 minutes. Alternatively, detouring around the Gorge via Boundary Road takes approximately 40 to 45 minutes, and can increase significantly during peak hour times. From Tunks Creek Bridge to Hornsby Heights, the narrow road stretches approximately three kilometres with an average incline of 5%, and contains six hairpin corners. Given this, the road is challenging for longer vehicles and heavy vehicles over 7.5 m in length are prohibited. The road contains a guard rail along the Berowra Creek side of the road to enhance its safety however, the road is renowned for its dangerous nature. The Gorge is also accessible via foot or bicycle. The Galston Gorge East and Galston Gorge West climbs are both routes which are commonly taken by cyclists. The Benowie Walking Track, the Tunks Trail and the Ulolo Trail are suitable bushwalking trails that run through the Gorge. The most significant of these is the Benowie Walking Track, which forms part of the Great