Middle Arm Bridge, Transit bridge in Richmond, Canada

Middle Arm Bridge is a transit and railway bridge in Richmond that spans across the Fraser River, connecting Vancouver International Airport on Sea Island with Lulu Island. The concrete structure carries two separate tracks for trains moving in opposite directions at the same time.

The Middle Arm Bridge opened in August 2009 with the airport branch of the Canada Line, one of three transit bridges in Metro Vancouver. It was built by cantilever construction in prestressed concrete, a cost-efficient method for its box girder span. The nearby Moray Bridge, a swing bridge, had also previously been called the Middle Arm Bridge.

The bridge carries the airport branch of the Canada Line, opened in August 2009, so passengers crossing it ride between Lulu Island and Sea Island. Its integrated arch form was designed to look minimal while supporting the weight of the trains. A nearby swing bridge, the Moray Bridge, was also once called the Middle Arm Bridge, a name travellers still encounter.

The bridge carries the airport branch of the Canada Line between Bridgeport station on Lulu Island and Templeton station on Sea Island, so the crossing is made by train rather than on foot. There is no walkway or viewing platform on the structure. Riders see the prestressed concrete box girder and its integrated arch from the windows as the line crosses the middle arm of the Fraser River.

The bridge's name is shared with the Moray Bridge, a nearby swing bridge that was also formerly called the Middle Arm Bridge. The Middle Arm Bridge is one of three transit bridges in Metro Vancouver, and its integrated arch form is designed to appear minimal while supporting the weight of Canada Line trains.