Floating concrete septic tanks with the lids glued on, lol. Hard to believe they float that 4 lane hi-way across that span with 'um ain't it? The roundy-round half way across almost made me wet myself the 1st time I crossed. It waz raining Pitch Forks and Ax Handles that time. JerI agree, it looks the bridge "over" Lake Washington in Seattle (Puget Sound).