The Washington State Department of Transportation and Sound Transit have opened an environmental investigation into the deaths of approximately 2,000 fish in Lake Washington near the Interstate 90 floating bridge.
According to coverage by Lynnwood Times , the spatial concentration of dead fish was tightly confined to zones directly adjacent to specific bridge anchor points rather than dispersed widely across the open lake basin.
In deep water, electrical current diffuses uniformly into the surrounding water column.
As confirmed by KING 5 , divers identified thirty-two anode cables that had accumulated heavy sediment or settled directly onto the bottom substrate near both Mercer Island and Seattle shores.
The original design called for electrical isolation pads beneath running rails, stray current collection mats, and the impressed current cathodic protection network.
Sound Transit and WSDOT are investigating the deaths of approximately 2,000 fish in Lake Washington after an impressed current cathodic protection system on the I-90 floating bridge created localized electrical fields near the lakebed.