The project has a contract sum of $163m (Sh18.7 billion).
The project is co-funded by the Japan Int. Cooperation Agency.
The airfield will be located at Gatuanyaga Village, Thika East.
The 457-metre bridge replaced a causeway built by colonialists in 1929.
The project is being undertaken by BOMI E&C Consortium.
The 70km road will be upgraded to bitumen standards.
The 59-metre-high dam occupies a 600-acre site.
The Lanet military airstrip will be converted into a civilian airport.
Chinese firm CJIC was awarded the contract mid last year.
Likoni Cable Express to be built under a public-private partnership.
The LW3600-240NB stands at roughly 241 metres and lifts up to 240 tonnes.
The 715, with a 7.1m³ body and 12,750kg payload, sits in the mid-range of ADTs.
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A new city, Bradfield City, will rise next to Western Sydney Airport.