A total of 56 dams will be implemented under the PPP model.
The project has proved too costly and unattractive to investors.
The African Development Bank says the project risks time and cost overruns.
China Jiangxi is demanding Sh846.5m before resuming excavation works.
The projects were discontinued in 2018 due to a financial scandal.
The bridge, which opened on Jan. 1, 2021, was to be retired in 2025.
Gatundu residents claim the dam will render the area uninhabitable.
The projects are scheduled for completion in October 2024.
The 50km bridge will connect Dar es Salaam with Zanzibar Island.
The BRT corridor was scheduled to open for trials in July 2022.