The four-lane dual carriageway is now 99% complete.
Atomic Energy Agency says country is ready for nuclear power.
Olkaria 1 Unit 6 will inject 83MW into the national grid.
The road begins at Mlolongo, connects JKIA to the CBD, and ends in Westlands.
On completion, it will be the third highest bridge in Africa.
The project has been delayed by land compensation disputes.
The project has a contract sum of $163m (Sh18.7 billion).
The project is co-funded by the Japan Int. Cooperation Agency.
The project is on schedule for final completion this year.
The new bridge is expected to be ready in June.