The construction work on the last phase of the Colombo Outer Circular Highway (OCH) is expected to be completed by July 2019, the Road development Authority (RDA) said.
The 29.5 kilometer OCH starts from Kerawalapitiya along the Colombo - Katunayake Expressway to link with the Southern Expressway crossing A-4 highway at Kottawa and the main A-1 Colombo-Kandy highway at Kadawatha.
The third and last phase of the OCH (OCH-3) from Kadawatha to Kerawalapitiya extending 9.63 kilometers is currently under construction. The RDA said that about 65% of the construction work has already been completed.
The second phase of the Outer Circular Highway from Kaduwela to Kadawatha was opened to the public in September 2015 while the first phase from Kottawa to Kaduwela was opened in March 2014.
In the third phase, a new interchange will also be constructed close to the starting point of the proposed Colombo-Kandy Central Expressway. The four-tier interchange will be the highest in the country, according to RDA.
6.3 kilometers of the total distance will also be on long bridges since the expressway runs through the Muthurajawela wetland area and low land areas with paddy fields.
RDA further said that the water drainage plan was prepared after gaining approval from the Central Environment Authority.
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