Oklahoma is on a mission to ensure it never again wins the dubious honor of having the nation’s highest percentage of substandard bridges. The Oklahoma Transportation Commission this month approved a $4.3-billion, eight-year budget to fund 1,750 vital bridge and highway projects from 2011 through 2018. The transportation budget is the state’s largest ever, says Oklahoma Dept. of Transportation spokeswoman Terri Angier. Photo: Oklahoma DOT More than wear and tear, debris accumulation can accelerate a bridge’s structural undermining. In 2002, the non-profit organization The Road Information Program (TRIP) reported that Oklahoma had the country’s highest percentage of structurally deficient or
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.