The Piako County Tramway in the Waiorongomai Valley was built and financed by Piako County Council in 1882-1883 to transport ore from the gold mines in the valley to the Firth and Clark Battery at the base of the valley near Waiorongomai Village. The tramway was about 5km long, and consisted of 3 level sections, joined by 3 self-acting inclines. The longest and best preserved of these is Butlers Incline, at 400m long and 25 degree slope.
The rails on the lowest incline, Fern Spur Incline, have almost all been removed or stolen. Only two very short sections at the bottom end and at the top end have been reconstruction. There is no track following the exact route of the incline, but the High Level Pack Track does give access to both ends of the incline, and goes through a cutting where the incline passed over the track.