Pontoon Rhine Bridge of 1865 in Germany was temporarily used for a railroad. Usage The bridge carries four westbound lanes, including a HOV lane, as well as a bicycle and pedestrian path on the north side. The path is wide and includes two barriers: a outer railing and a concrete barrier facing traffic. Prior to 2017, it also carried two reversible lanes, configured to normally carry westbound traffic on weekday mornings and eastbound traffic at other times. Use of the reversible express lanes was restricted to HOV traffic, except for vehicles traveling to and from Mercer Island. With a total of five traffic lanes and three full-sized shoulders, the Third Lake Washington Bridge was the widest floating bridge in the world, until the completion of the new Evergreen Point Floating Bridge in 2016. See also Lacey V. Murrow Memorial Bridge List of Seattle bridges References External links Bridge Camera, includes some weather information Bridges completed in 1989 Bridges in Seattle Bridges in King County, Washington Monuments and memorials in Washington (state) Interstate 90 Road bridges in Washington (state) Bridges on the Interstate Highway System 1989 establishments in Washington (state) Pontoon bridges in the United States