Inside the Siyuan Yakou pavilion, there is a "Central Cross-island Highway Yilan Branch Project Monument", which records the beginning and end of the road construction project. On the back of the stele, there are four words "Ying Shui Si Yuan" (meaning: drink water and remember the water source, be thankful) inscribed by General Zhou Zhirou, the then chairman of the Taiwan Provincial Government in August 1961. This is the origin of the place name "Siyuan Yakou". The Yilan branch line of Central Corss-island Highway began construction in January 1955 and completed in March 1959, with a total length of 111 kilometers. The predecessor of this road was the Pyanan Historic Trail during the Japanese rulw. In order to facilitate traffic and manage the indigines, the Japanese began to build the trail in the 7th year of Taisho (1918), which extended from today’s Leshui Village in Yilan County, passing through Mao'an, Siji, Nanshan, Siyuan Yakou in Taichung City, Huanshan, Lishan, Mailiguan in Nantou County, Marleba, Hongxiang, Ruiyan to Wushe, with a total length of about 120 kilometers. It was completed in the 10th year of Taisho (1921).
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