A rancorous contractor bid dispute has held up a $100-million-plus four-lane widening of Las Vegas’ Interstate 215 Beltway. The contract has been twice awarded and twice taken to court. The Clark County Commission gave locally based Las Vegas Paving Corp. the job after disqualifying the apparent low bidder, Fisher Sand & Gravel Co., Dickinson, N.D., because two of its subcontractors lacked highway construction licenses. Under county rules, the design-bid-build project is typically awarded to the lowest responsible bidder. Fisher’s price was $112.2 million, or $4.6 million less than Las Vegas Paving. On April 22, Fisher sued Clark County over a
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.