A deal with Sen. Tom Coburn (R-Okla.) that freed a stalled stopgap highway-aviation bill is changing another bill. A two-year highway measure that Environment and Public Works panel leaders are drafting now will give states new flexibility in the transportation enhancements program. Under current law, states must spend 10% of their Surface Transportation Program aid on bike paths and other enhancements. Coburn said that diverts funds from other uses, such as bridge upgrades.
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.