1. Park in the car park situated above the Glen Nevis road just before reaching the bridge at Polldubh. It is worth walking over to this bridge before starting the walk to have a good look at the Polldubh Falls (also known as the 'Lower Falls'), usually busy with coach parties. Begin the route by heading the opposite way up the road, back towards Fort William. After a couple of hundred metres the road passes the white cottage at Achriabhach on the right, and just beyond this there is a track heading into the forest on left. Turn up this track.
2. As the track enters the trees, take a path off to the left. This climbs up close to the edge of the conifers, soon reaching a large ladder stile. Cross this and continue up the path, which ascends steeply and is close enough to the forest edge to give views across the glen. Further up, the path passes a waterfall on the Allt a'Choire Dheirg; this has much less volume than the Polldubh falls but is higher and unfrequented. Continue the ascent on the path until it reaches a forest track at a sharp bend, with a view of the mountain ridge around Coire Dearg high above..
3. Don't go along the track, but take the path opposite. This continues the ascent; after a short distance there is a seat on the left with a truly magnificent view up Glen Nevis towards the Nevis Gorge. Continue up the path, with improving views of Ben Nevis behind, until finally a flight of stone steps brings you up to another forestry track.
4. Turn right along this track; there are more great views ahead, this time down Glen Nevis towards the foot of the glen. Follow the track gently downhill until it meets a junction with another track. Turn sharp right here, and continue down this new track to reach the sharp bend the path briefly crossed earlier. This time continue on the track which swings sharply to the left.
5. The descent continues on the track to yet another junction. As before, turn sharp right for this final zig-zag, and follow the track back down to the road at Achriabhach and the start.