Construction of 77 concrete pontoons for the replacement of the world's longest floating bridge has reached the halfway point. Redesigned cycle 3 pontoons are floating toward the Seattle jobsite ...

The first of six new large pontoons has arrived in Lake Washington and is waiting to be installed on the 520 bridge. At 360 feet long, 29 feet tall, and 75 feet wide, the pontoon weighs 11,000 ...

Composite pontoons undergird update of 1820s-vintage floating bridge. ... Replacement became necessary when 380 of the 50-gal barrels that kept it afloat began to leak. “The plastic styrofoam-filled ...

MATS MATS BAY — The Mats Mats rock quarry is one of two sites being evaluated for a graving yard to construct state Highway 520 floating concrete bridge replacement pontoons. “Mats Mats Bay and the ...

The first of six new large pontoons has arrived in Lake Washington and is waiting to be installed on the 520 bridge. At 360 feet long, 29 feet tall, and 75 feet wide, the pontoon weighs 11,000 ...