Albert D. Rosellini Floating Bridge


The Evergreen Point Floating Bridge, built 1960-1963, is the longest floating bridge in the world. Essentially a 1.42-mile-long barge, it was an innovative and cost-effective engineering solution to the problem of how to span a lake bed too wide and deep for a suspension bridge. Unfortunately, it has become a victim of its own success. Originally designed to handle a maximum of 50,000 cars a day, it now carries twice that number. The bridge has been reinforced and repaired, but it will likely to be too costly to retrofit the bridge to meet current wind and earthquake standards.

Activity Details

Activity Type:Trips and Destinations
Discipline:Civil
Topic(s):Structures
Grade:K-2, 3-5, 6-8, 9-12
Time:Full day

Fun Fact:The Evergreen Point Floating Bridge is constructed of 33 prestressed concrete pontoons. A typical pontoon measures 360 feet long, 60 feet wide, and 14 feet, 9 inches deep. The bridge has a retractable drawspan in the middle, and when it opens, the middle pontoons separate and roll underneath the raised sections like drawers.