Indiana and Kentucky are seeking to fast-track a new bridge over the Ohio River between Madison, Ind., and Milton, Ky. Using design-build to replace the badly deteriorated 3,181-ft-long steel-truss superstructure and modify the concrete piers means opening a new bridge in 2012, rather than finishing environmental processes in 2012, says Kevin Hetrick, INDOT project manager. Initial estimates peg the total cost at about $131 million. The federal government will pay $20 million through an ARRA TIGER grant. Indiana and Kentucky will split the remaining cost equally. INDOT plans to open bids on Sept. 15. The bridge will be closed in
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.