This bridge, one of the bridges spanning the Nishiyokobori River, was formerly known as "Tomitamachi Bridge" and later as "Tonobashi Bridge." Records from the Genroku period (1688-1704) show the name Shinano. At the time, the bridge was approximately 25.9m long and 3.9m wide. Said to have been dug by the first lumber merchant, Nagase Shichiroemon, the Nishiyokobori River runs north-south through central Osaka, from the Tosabori River to the Dotonbori River. The riverbank was lined with various merchants, particularly lumber merchants and porcelain merchants. With the opening of the city tram in 1913, Shinano Bridge was replaced with a three-span (with two piers along the way) simple steel plate girder iron bridge (length 23.0m, width 22.0m), but the Nishiyokobori River was filled in between 1964 and 1971 to construct the Hanshin Expressway, and the bridge disappeared. Now only a stone monument remains.