Old Erren River Road Bridge
Old Erren River Road Bridge was built in 1921, it used to be an important bridge connecting Tainan and Kaohsiung. However, as time goes by, the new bridge was built and the there're safety issues with the old one, so currently it's not in use anymore. It had been destroyed twice and rebuilt before, so the northern part and the southern part of the bridge looks different, so as to the style of its piers.
二層行溪舊公路橋完工於1921年，至今超過百年，為市定古蹟，其曾為縱貫公路省道臺一線；民國52年縱貫公路改道，另興建新橋，二層行溪舊公路橋改為僅供輕型機車及行人通行；之後因年久失修及安全問題，禁止通行。其曾因戰火被炸斷，兩度修復，使用材料不同，北側仁德端為原本的鋼筋混凝土樣式，而南側的湖內端則為改建後的鋼桁樑樣式，兩邊的橋墩結構也不一樣。