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Hidakasanmyaku Erimo Tokachi NP, Hokkaido
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From 2005–13, 333 volunteers carried about 4,016 kg of toilet waste downhill from the hut; 23 volunteers hauled another 210 kg in 2014. Today, mountain-club members still carry generator fuel in and weekly loads of used portable-toilet bags out.
The hut uses small-scale hydro and solar power to run its bio-toilet. When the hydro system failed in September 2026, the mountain club switched to a gasoline generator and temporarily turned off Wi-Fi and indoor electricity to save power.
Built in 1965, Poroshiri-dake Sanso began as an emergency shelter for forestry workers managing national forest—not as a tourist lodge. It became Biratori Town property in April 2000, and the local mountain club now helps maintain it.
The hut takes its name from Poroshiri-dake. Biratori Town gives the mountain’s Ainu name as ポロ・シㇼ (poro-sir), meaning “big mountain”—a fitting namesake for the highest peak in the national park.
