In Typhoon Hester that hit the area in July 1949, record amounts of total rain fell in the area, 519 mm at the site of the administration office in the field practice forest and more than 600 mm at Mikuni-dake Mountain in the east, damaging or destroying more than half of the buildings there, except the administration office.
1949年7月のへスター台風では演習林事務所で総雨量が519mm、東部の三国岳では推定600mmを超える記録的な大雨に見舞われ、演習林事務所を除く建物の大半が破損したり流失した。