The Mike O'Callaghan - Pat Tillman Memorial Bridge located on the Nevada / Arizona border has become a tourist attraction of it's own and I am surprised it's not been given a Yelp review listing. This review intends to change that. The Bridge is an 2012 Outstanding Civil Engineering Achievement Award winner as per the American Society of Civil Engineers. While the accolades are nice, stepping foot onto the walkway along the North side of this span will leave no doubt about this bridge and it's status as an American Civil Engineering Masterpiece.
Access to the bridge is via the same 2 lane highway you take to get to Hoover Dam. You will have to stop for a security checkpoint. Don't worry, it's usually quick to get through even when traffic is heavy. Once past the checkpoint you go under Highway 93 and the parking area is well signed, and except during peak times on weekends you'll likely find a parking space. There are also restrooms here.
Access to the bridge is easy and is wheelchair / stroller accessible. You also have the option of skipping the ramps and taking steps which shortens the distance. At the top of the ramps / steps follow the wide sidewalk through the cut in the rocks, and take time to read the informational signage and displays that tell about the history of the bridge and how it was built. Then with a few steps you'll be walking out over the Colorado River and to a truly spectacular view of Hoover Dam.
While walking the bridge there are markers imbedded into the sidewalk to mark the state line and other recognition of the span's uniqueness. But you may miss that as you peer off over the edge. The walkway is only accessible from the Nevada side, the Arizona side ends with a concrete wall at the end of the span. There is also a high concrete wall separating the walkway from traffic on Highway 93. This same high wall makes it almost impossible to see the dam from the bridge if you cross over it in a car.
One caution: Be aware of the wind. When Las Vegas has a wind advisory up the wind can be stronger here than anywhere else in the entire valley. Also I definitely recommend 3 items. Water. Sunscreen. And of course a camera but one with a tether to wrap around your hand so you can take a picture from the railing if you're not afraid to get that close to the edge. Also of note, yes it can get a bit crowded on the bridge during peak times. Other times I've seen only a handful of people there. And the bridge is closed at sunset so no you can't get a night picture of Hoover Dam from the span.
I rank walking across this bridge as a truly monumental experience, only a much longer walk across the Golden Gate Bridge exceeds it. 5 Stars...without question.