The coastal region was the biggest winner in the just concluded three-day visit by President Kenyatta to Japan.
According to a brief on the tour, a third bridge linking Mombasa Island to the South Coast will be constructed in the next five years by the Japanese government.
The Japanese also pledged to help with desalination of sea water that will cater for the more than 1.7 million people.
Although the brief did not contain the amount to be spent in the construction of the bridge, officials said it would greatly ease human traffic that rocks Likoni crossing especially during peak hours.
The project is one of the several goodies President Kenyatta brought from Japan visit.
During the tour, the Japanese government also pledged to invest heavily on infrastructure, agriculture, environment, education and health.
An infrastructural project involves the construction of a crude oil pipeline to serve Kenya, Uganda and Rwanda.
A feasibility study will be conducted by Toyota Tsusho which will prepare preliminary engineering designs for the crude oil export pipeline.
“By April 2015, the feasibility for Hoima-Lokichar-Lamu crude oil pipeline will have been completed for construction to commence,” a document to the President states.
Japan is also eyeing the Mombasa port operation concession which is set to begin in March 2016.
However, the country will have to fight with UAE in the tendering process. “Our consortiums long-term contribution is to make Mombasa port a number one African port operation experience, effective crane operation and maintenance and education for lean operation,” the brief read.
On power, Japan committed to take further steps in geothermal projects after successfully completing the construction of Olkaria power plants.