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The Pattullo Bridge, which connects Surrey and New Westminster, has been closed to traffic since it was damaged by fire Sunday morning. (CBC)

The Pattullo Bridge, damaged by fire Sunday morning, could be reopened in two weeks, the B.C. south coast transportation authority said Wednesday.

TransLink said crews will begin replacement work Thursday on the bridge's burned wooden trestle, which caught fire Sunday.

The damaged trestle has already been removed, TransLink said, and crews will use a steel and concrete structure to span the 18-metre gap.

They will work round-the-clock until the replacement piece is inserted, which could take up to two weeks, said Sheri Plewes, TransLink's vice-president of capital management and planning.

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Crews examine a burned section of the Pattullo Bridge on Monday. ((CBC))

The Pattullo, which connects Surrey and New Westminster over the Fraser River, was closed on Sunday when the fire damaged a section of wooden trestle supporting the southern end of the 72-year-old bridge.

The news will be a relief for hundreds of thousands of Metro Vancouver commuters battling traffic gridlock since the bridge was shut down.

The closing of the bridge has jammed traffic on alternate routes across the Fraser River, including the George Massey Tunnel, the Alex Fraser Bridge and the Port Mann Bridge.

Police were continuing to investigate the fire on Wednesday. The RCMP has said they suspect the blaze was ignited by a campfire lit by a group of homeless people living under the bridge.