The Mithi River is a river on Salsette Island, the island of the city of Mumbai, India. It is a confluence of tail-water discharges of the Powai and Vihar lakes. The river is seasonal and rises during the monsoons. From Wikipedia
The re-girding of Bridge 20 over the Mithi River will take place on April 11-12 and April 12-13, with additional services planned to mitigate disruptions.