Related Links: Plan to Refill Highway Fund Stokes Conflict in Congress If Congress ever progresses beyond its current partisan dysfunction, perhaps we will look back on June 18 as a turning point. That was the day Sens. Chris Murphy (D-Conn.) and Bob Corker (R-Tenn.) proposed raising the federal gasoline tax 12¢ a gallon over two years as a way to end the impending deficit of the Highway Trust Fund, the key source of highway and mass transit construction funds shared with the states. The tax hasnot been raised since 1993, when Congress upped it from 14¢ to 18.4¢; fuel-efficient cars
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.