The water flowing down the Kaneri river will also contribute its share to the first stage of the project. The Upper Kaneri reservoir draining a small area of 98 sq km will supplement the storage of water in the Supa reservoir.

A 27 m high 163 m long concrete gravity dam is built across Kaneri river, a tributary to Kali river near Kumbarwada village in Joida Taluk, Uttara Kannada District, with a gross storage capacity of 16.3 M cum. Four radial gates of size 11.2 m x 7.8 m each are provided to regulate the flood discharge. The FRL is EL 615.50 m and MDDL is EL 599.50 m, 379 M cum of water from this reservoir is diverted to Supa reservoir through an intake structure and water conductor system.