SAN FRANCISCO -- Beginning Tuesday, Caltrans will commence repairs on the Bay Bridge fenders damaged after an oil tanker grazed them, the agency announced Saturday.

The fender system on the easternmost part of the West Span was damaged on Jan. 7 after it was struck by an oil tanker. According to Caltrans, the fender system absorbed the impact and the main pier did not have any structural damage.

Crews will replace the damaged fender sections, which are made of steel and recycled plastic. The repairs are expected to last about four and a half months.

The project will cost roughly $3 million.

Contact Katie Nelson at 925-945-4780 or follow her at Twitter.com/katienelson210.