Albert D. Rosellini Evergreen Point Bridge No. 520/8

Spanning across Lake Washington in Seattle, the Evergreen Point Floating Bridge, also known as the 520 Bridge, and also officially known as Governor Albert D. Rosellini Bridge, is a 7,710 foot long, floating span structure making it the world’s longest, and the world’s widest floating bridge, measuring 116 feet across at its midpoint. Coffman performed mechanical and electrical inspection services including random pump and fire pump testing as well as testing of all electrical feeders, testing of two MV transformers, and random testing of control system and sensors. Inspections performed included an overall condition assessment of the bridge’s electrical systems.


  • Civic & Local Government


  • Bridge Engineering
  • Electrical Engineering
  • Mechanical Engineering