[1] The mountain had an elevation of about 20 meters at the time, and served as a marker for ships entering the Ajigawa river to head to the city of Osaka.

As industrialization progressed in the Taishō and Shōwa periods, overuse of groundwater resulted in subsidence, lowering the mountain's elevation even further.

The park's clock-tower was originally a prop for a television show produced by the Kansai Telecasting Corporation, but was later donated to the prefecture.

The club held annual "climbing events" on new year's day and April 5th (in reference to Mount Tenpō's 4.5 meter elevation) which by 2000 drew the attendance of around a thousand people as well as newspaper and television coverage.

In the spirit of いちびり (ichibiri, an Osaka dialect term meaning "taking a joke to the extreme") they issued commemorative "mountain climbing certificates" at these events and also to anyone who would apply and pay the issuance fee of 10 Yen.