Hike at a Glance
Max elevation: 724m
Min elevation: 339m
Total Ascent: 563m
Safety advice
The Lerderderg State Park is rugged and remote with limited directional signage. You should be prepared for all conditions and have suitable navigation experience (not just a phone app) before venturing beyond the main picnic/parking areas or Grahams Dam. Many rescues have occurred in this park that could have been avoided.
Hike overview
The Razorback, Lerderderg and Lower Chadwick Circuit is a rugged and rewarding 13-kilometre loop tucked deep within Lerderderg State Park in Victoria. Typically completed in around five to six hours, this grade 4 hike blends defined tracks with off-trail river walking, offering a route that’s best suited to experienced hikers who are comfortable navigating less-travelled terrain.
The journey begins at the Square Bottle Track carpark. After a short walk, you'll come across the Razorback Track veering off to the right. Take this turn and continue for roughly 2.5 kilometres until the Razorback North Track appears on your left. From here, the trail drops steadily towards the river. The descent becomes steeper as you go and can be quite slippery in places, so steady footing and care are essential.
Once you reach the Lerderderg River, turn right (south) and begin making your way downstream. There’s no formed trail here, nor any signage to guide your steps, so you’ll need to assess the best route as you go, moving between riverbanks and scrambling over rocks as needed. It’s a beautiful, quiet stretch of the gorge, with the river winding between cliffs and thick bushland. This part of the hike offers a strong sense of remoteness and natural beauty, but it’s also where solid navigation skills are crucial. Keep a close eye on your map or GPS as the exit can be easy to miss.
Look out for the Razorback and Lower Chadwick Track junction at Emergency Marker LER516, which is where you’ll leave the river and begin climbing again. The Lower Chadwick Track ascends sharply at first to the south west, but soon flattens out along the spur. When I last walked this route, sections of the trail were heavily overgrown and had all but disappeared in places. If you lose the path, stay on the ridge line — it eventually becomes clearer again. In parts, you might notice the remains of an old stone wall hidden beneath the undergrowth, a quiet reminder of the area’s past use.
As the trail rises, it eventually eases off on a knoll near the junction with MacKenzies Track. Keep to the right and continue climbing along a narrower ridge. The gradient here is more forgiving, and not long after, you’ll emerge onto the open grassy slopes of Mount Blackwood. The final push towards the summit follows a faint path westward, and although the climb is steady, it’s not as demanding as earlier sections. From the top, you’ll be treated to wide views across the surrounding ranges, a fitting reward after the effort.
The last leg of the hike follows Tower Track, a sealed road that gently descends towards Mount Blackwood Road. Turn right at the junction and continue along the roadside until you return to the Square Bottle Track carpark. Though the circuit includes a bit of everything — singletrack, river scrambling, overgrown spurs and quiet roads — it’s the sense of isolation and the varied terrain that make this route so compelling for those seeking a more adventurous day out in the Lerderderg.
Tips
- The amount of water in the river will dictate how difficult this is. If it is low it should be quite straightforward, but if the river is full it will be much more challenging. Therefore, if there is a lot of water, then add an extra hour or so to it.
- There can be many snakes in the area so do keep a look out for them.
- Hiking poles will be very useful for this hike.
Walk map and GPX file
Max elevation: 724 m
Min elevation: 339 m
Total climbing: 563 m
Total descent: -562 m
Content use
Every trail on this site has been personally mapped and refined to support Australia’s hiking community. While some info comes from land managers, each listing reflects significant personal work. Please don’t upload GPX files or content from this site to AllTrails or any other platform. This is a free community initiative—your respect helps keep it that way.
Getting there
Closest towns to this walk: Bacchus Marsh, Ballan, Blackwood, Bullengarook, Coimadai, Darley, Daylesford, Gisborne, Kyneton, Macarthur, Macedon, Maddingley, Melton, Myrniong, Sunbury, Trentham, Woodend
Getting to the trailhead in Lerderderg State Park.From Melbourne, follow the Western Freeway 9km past Bacchus Marsh and take the Myrniong exit. Continue along the Myrniog-Greendale Road for 1km, then turn right on the Mount Blackwood Road. Follow this narrow surfaced road north for 10km to pull into a turnoff on the right at Square Bottle Track (just 250m past Shutter Track). Park near the gate overlooking a small dam.
About the region
Rising in the Great Dividing Range, the Lerderderg River has cut a 300 metre deep gorge through sandstone and slate, almost bisecting the park. The park has a wide variety of vegetation and wildlife and some interesting relics of gold mining. Lerderderg State Park encompasses scenic and geological gorge formations surrounding the Lerderderg River as well as the volcanic cone of Mount Blackwood. The adjacent and separate block called the Pyrete Range forms part of the park. The Lerderderg is known for its remote setting and the 300m deep Lerderderg River gorge is a dominant feature. Private land abuts the park to the south and the Wombat State forest abuts to the north and west.
Lerderderg State Park (incorporating the former Pyrete State Forest) is a 14,250-hectare park located between Bacchus Marsh and Blackwood, an hour's drive from Melbourne, Australia. There are several maintained tracks for walking through the park and camping is allowed.
The park is named for the Lerderderg River which has cut the 300 metre deep Lerderderg Gorge through sandstone and slate, almost bisecting the park. Parks Victoria maintains six designated walks: three short walks of 3.5 km or less; Blackwood-O'Briens Crossing and return (22 km); O'Briens Crossing-Cowan Track loop (14 km); and the overnight walk O'Briens Crossing to Mackenzies Flat (20 km).
In addition, one leg of the Great Dividing Trail, the Lerderderg Track, passes through the park, entering from Blackwood in the park's northwest, and exiting south towards Bacchus Marsh. Bicycles are prohibited from one section of this track, due to a conservation area.
Similar trails nearby
Looking for hikes and trails in Lerderderg State Park or nearby? Try these walks with a similar grade.
Track grade
Grade 4 (Hard) - Challenging Walks for Experienced Walkers: Grade 4 on the AWTGS signifies challenging walking tracks. Bushwalking experience is recommended for these tracks, which may be long, rough, and very steep. Directional signage may be limited, requiring a good sense of navigation. These walks are suited for experienced walkers who are comfortable with steeper inclines, rougher terrain, and potentially longer distances.
Explore safe
Plan ahead and hike safely! Carry enough water, pack layers for changing conditions, and bring safety gear like a torch, PLB, and reliable communication device. Check official sources for trail updates, closures, and access requirements, and review local weather and bushfire advice. Most importantly, share your plans with someone before you go. Being prepared makes for a safer and more enjoyable hike! Stay Safe, Explore More, and Always #ExploreSafe.
Packing checklists
What you carry in your pack depends on factors like weather, terrain, and your adventure type. Not sure what to bring? My free planning, food, and packing checklists are a great starting point, covering day hikes, overnight trips, and multi-day adventures. Use them to customise your kit and always prioritise safety.
Let someone know
Before heading out, take a moment to fill out your trip intentions form. It’s a quick way to share your hike details with family or friends. If something goes wrong, they can notify emergency services, ensuring a faster response and peace of mind. Stay safe and enjoy your adventure
Suggest an edit
Spotted a change on this trail? Maybe there are new features, the route has shifted, or the trail is permanently closed. Whatever the update, I’d love your input. Your feedback helps fellow hikers stay informed and ensures that our trail info stays fresh and reliable.
Acknowledgement of Country
Trail Hiking Australia acknowledges the Traditional Owners of the lands on which we hike and pay respects to their Elders, past and present, and we acknowledge the First Nations people of other communities who may be here today.
8 Reviews on “Razorback, Lerderderg & Lower Chadwick Circuit Hike (13km)”
Yes geo tracker is an app so you could be right about its being not 100% accurate
Haha. No, it was me losing it. Gees that would have been a challenging hike for first timers. They would have been cursing me.
Thank you for sending me your GPX file. There seems to be a few places where your GPS dropped out as well as quite a few places where it appears you stopped for breaks or back-tracked. With these being so prevalent in the recording it is difficult to know what the true length should be.
I am also assuming that Geo Tracker is an app and not a true GPS device? The Lerderderg has a lot of steep gullies where a non-dedicated GPS will often loose coverage, as shown in your file.
I live just near the Lerderderg so I will head back out and record this again as a alleged 6km difference is too much to just brush off. Thanks for bringing this to my attention, I will update the length after I have completed this hike.
Just done the track today. It took us 8 hours and the circuit is actually almost 19km not 13 as stated here .
Martin Tim training grounds aren’t they?
Sheree
Kathy Paquin