The Pul-i Jui (Canal Bridge), also known as "Pul-i Chubi" (The Wooden Bridge), was constructed in 1654-5 as a method of carrying a canal over the Zayanda Rud, hence its name. The bridge has 21 arches and is 147 meters long.
Sources:
Honarfar, Lotfallah. Historical Monuments of Isfahan. Tehran: Ziba Press, 1971.