State Highway 85 (SH 85) is a South Island state highway in New Zealand, servicing the Maniototo Plains and the North and Central Otago regions of the South Island between the major settlements of Alexandra and Palmerston.

It is wholly two lane and passes through some of the most extreme climatic regions in New Zealand.

Officially named the "Halfway House", but colloquially known as the Pigroot Hotel, it was run by the proprietors John and Isabella Freeland.

Today, the Pigroot Creek Bridge which runs over the Shag River is the only reminder of this town.

After passing through Chatto Creek, Omakau, Lauder and Becks, the road crosses the river and ascends onto the high plateau known as the Maniototo Plains.