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. in 1893. These bridges were open to the public in 1895. Although, the McDonald Truss bridge crossing Berowra creek was washed away during a flood in 1937, which led to the replacement of the second bridge. It was replaced with a concrete bridge in 1937 and is the same bridge used to this day. The larger size of the bridge at the time provided access for fire-fighting vehicles with access between
Hornsby and
Dural. Given this, the road is challenging for longer vehicles and heavy vehicles over 7.5 m in length are prohibited. however, the road is renowned for its dangerous nature. 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 North Walk that extends from
Sydney Cove to
Newcastle. The Heritage Bridges Walk is an established bush-walk which begins at the constructed
wetlands in Clarinda Street, Hornsby, and follows predominantly
fire trails with views of the two bridges before ending at the bottom of Galston Gorge. == Local flora and fauna ==