At the beginning of Rue Radisson you can see the remains of the Gier aqueduct. It stretched along 86 km, through 11 tunnels, over 50 bridges and rows of arches that carried the channel and it had four traps, a unique feature. The aqueduct begun at the Gier dam in Saint-Chamond (Loire), 400 m above sea level and, after various topographic difficulties at its start, it could carry 15,000 cube metres of tap water a day to the highest point of the city (Fourvière). It was the longest of the four city aqueducts and the one whose structures are best preserved. It has been a historical monument since March 1912.