Middle Arm Bridge
Encyclopedia
Fraser River
The Fraser River is the longest river within British Columbia, Canada, rising at Fraser Pass near Mount Robson in the Rocky Mountains and flowing for , into the Strait of Georgia at the city of Vancouver. It is the tenth longest river in Canada...
, linking Lulu Island
Lulu Island
Lulu Island is the name of the largest island in the estuary of the Fraser River. The island makes up most of the City of Richmond, a major suburb of Vancouver, British Columbia...
with the Vancouver International Airport
Vancouver International Airport
Vancouver International Airport is located on Sea Island in Richmond, British Columbia, Canada, about from Downtown Vancouver. In 2010 it was the second busiest airport in Canada by aircraft movements and passengers , behind Toronto Pearson International Airport, with non-stop flights daily to...
on Sea Island
Sea Island, British Columbia
Sea Island is located in the city of Richmond, British Columbia, directly across the river from Vancouver and fifteen kilometres from Vancouver's downtown core. The island is in the estuary of the Fraser River, giving it a unique ecological environment...
. It is used by the airport branch of the Canada Line
Canada Line
Canada Line is a rapid transit line in the Metro Vancouver region of British Columbia, Canada. Opened in August 2009, it is the third line in TransLink's SkyTrain metro network, servicing Vancouver, Richmond, and the Vancouver International Airport...
, which opened in August 2009.
The bridge is a box girder
Box girder
A box or tubular girder is a girder that forms an enclosed tube with multiple walls, rather than an or H-beam. Originally constructed of riveted wrought iron, they are now found in rolled or welded steel, aluminium extrusions or pre-stressed concrete....
prestressed concrete
Prestressed concrete
Prestressed concrete is a method for overcoming concrete's natural weakness in tension. It can be used to produce beams, floors or bridges with a longer span than is practical with ordinary reinforced concrete...
bridge, and is built using cost-efficient cantilever
Cantilever
A cantilever is a beam anchored at only one end. The beam carries the load to the support where it is resisted by moment and shear stress. Cantilever construction allows for overhanging structures without external bracing. Cantilevers can also be constructed with trusses or slabs.This is in...
construction. It is designed to have very little impact on the surrounding environment. The integrated arch
Arch
An arch is a structure that spans a space and supports a load. Arches appeared as early as the 2nd millennium BC in Mesopotamian brick architecture and their systematic use started with the Ancient Romans who were the first to apply the technique to a wide range of structures.-Technical aspects:The...
form is designed to appear minimal, while adequately supporting the weight of the trains that cross it.
The Moray Bridge
Moray Bridge
Moray Bridge, originally christened 'The Middle-arm Swing Bridge' in October 1957, is a low-level one-way swing bridge in Richmond, British Columbia, Canada...
, a swing bridge nearby, was also previously referred to as the Middle Arm Bridge.