The 520 Bridge happens to be the longest floating bridge not only in North America, but the world as well, measuring a whopping 7,710 feet across. This would make it surpass the old Highway 520 floating bridge that was constructed in 1963 by 132 feet, making its predecessor’s feat all the more impressive when you think about it.
As for the time gap between the westbound and eastbound lanes’ opening, this is attributed to the weekend work involved in moving barriers as well as to finish up other tie-ins that are between the floating lanes into the old 1963 bridge, which will then see it continue to ensure traffic flows from the Foster Island area to Seattle.