Engineers have to ensure the bridge will remain buoyant when a pair of 300-ton trains pass each other, and that the high-voltage current that powers the trains won’t stray into the bridge’s pontoons and corrode its steel rebar. They spent $53 million just to design the section across Lake Washington. — The Seattle Times
The Lacey V. Murrow Memorial Bridge is a floating bridge that stretches across Lake Washington, connecting Seattle and Bellevue through Interstate 90 freeway.
This April the final design promising to replace the center express lanes of I-90 with full speed light rail was signed off.
Subject to much controversy, Sound Transit has engineered and field-tested unique joints in order for the rail to account for the bridge's movement and weather conditions.
Rail service is projected to begin in 2023.
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