Related Links: Redesign Required For $4.1-billion Project's Pontoons Robynne Parkinson's blog post on the pontoon problems A poorly implemented project-delivery process that combined design-build and conventional design-bid-build created confusion that opened the door to faulty design work on the first four pontoons for Seattle's new Lake Washington floating bridge project, according to an internal analysis of the problems prepared for the Washington State Dept. of Transportation.The errors could add millions in costs and extend the project deadline, state officials say, compromising anticipated savings from the use of design-build to speed the overall project completion. Replacing the bridge is a priority
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.