Crews reach key step in Hwy. 520 bridge replacement

MEDINA, Wash. - After 10 years of talk, there is finally proof Thursday morning that work has started on the Highway 520 replacement bridge.

State Department of Transportation crews towed a huge barge in place overnight - a key step into putting the new bridge together. The huge barge, now floating on Lake Washington, has a crane and all kinds of equipment.

In June, the replacement pontoons for the floating bridge will be towed to an adjacent area. The new pontoons - 77 of them - are being built right now in Aberdeen.

The largest are more than a football field long, as tall as a three-story building and weigh the equivalent of 275 fully loaded tractor trailers stacked on top of each other.

The new bridge will be retro in design - it will be wider - and people will be able to walk across the bridge.

As for the construction barges - crews will be using them to dredge and install new anchors into the bed of Lake Washington.

The work isn't expected to disrupt traffic at all.