According to official records dating to 1910 in the Japanese colonial period, Tapo Lake covered about 55 hectares, or roughly the area of 55 soccer fields. But in the recollection of survivors from that era, Tapo Lake must have been at least 100 hectares in area.
根據日治時代 1910 年的官方記載，當時的大坡池面積達 57 甲（合約 55 公頃、55 個足球場大），而耆老的記憶中，大坡池應有上百甲之大。