To anybody who has tried to get to Las Vegas from the south, you know what a bottleneck Hoover Dam can be. It's always packed with tourists both in their cars and out. Highway 93 is also a major north-south artery, so it's usually a traffic nightmare. The USBR did its part to help alleviate the congestion several years ago by building a huge parking structure on the Nevada side. There was talk of a bridge to bypass the dam, but when I left the Lower Colorado Region, they were still bickering about which design would cause the least amount of environmental damage. After 9/11 the major concern became terrorism. It would take next to nothing to blow up a truck bomb on the top of the dam. Trucks were banned which just shifted the truck mess to Highway 95 to the west.
It looks like work has finally (ok, it's been a couple of years) begun on a bridge to bypass the dam. And what a bridge! HERE is the wikipedia article about it. There's also an official website for the project as well. I'm looking forward to seeing this bridge once it's complete! 840 feet above the river! Whoot! I wonder how long it will take before someone BASE jumps from it.