The new 50m crossing will provide increased access to the finish line area and improve athlete warm-up facilities.
"Dorney Lake is a first-class venue and the enhancements we are delivering will create the best possible facilities for the world's best athletes to use in 2012," said Olympic Delivery Authority chief executive David Higgins.
"Lifting in a new finish line bridge completes a key part of the enhancement works and keeps us on track to deliver improved facilities well before the Games begin in 2012.'
Further enhancement works at the site will include the construction of a cut-through between the competition lake and the return lane and the upgrade of the existing access road up to the competition venue.
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