Hoover Dam Bypass Bridge Overlook

Hoover Dam is one of the great engineering feats of the twentieth century, a massive concrete arch dam built across Black Canyon during the Great Depression to tame the wild Colorado River. Thousands of workers labored through brutal desert heat in the 1930s to raise it, holding back the river to form Lake Mead and generating hydroelectric power for cities across the Southwest. Its completion transformed the region, making possible the growth of desert cities that could never have existed without controlled water and power.

The dam sits on the border between Arizona and Nevada, and the river below it marks the state line. For generations it drew visitors as an icon of American ambition, but the two-lane road across its crest was never meant for modern traffic, and after security concerns closed it to some vehicles, the need for a bypass became pressing. The bridge was the answer, a way to route the highway around the dam while leaving it standing as the landmark it is.

The bypass bridge was a formidable project in its own right, spanning a deep, wind-scoured canyon in a remote and rugged setting. Its central arch, built of concrete, was raised from both canyon walls at once and joined in the middle high above the river, a delicate operation carried out with cables and cranes on a structure hundreds of feet over the water.

The finished bridge is one of the highest and longest of its kind in the world, and it carries the roadway on columns above the arch. It was named for Mike O'Callaghan, a former Nevada governor, and Pat Tillman, the Arizona football player who left the sport to serve in the Army and was killed in Afghanistan, one name from each state the bridge joins. The pedestrian walkway runs along the upstream side, safely separated from traffic, and delivers the view that has made the overlook famous.

Black Canyon is a stark, dramatic gorge where the Colorado River cut down through dark volcanic rock, leaving steep walls that plunge to the water. From the walkway you look straight down into it, with the river a green thread far below and the great curved face of the dam holding back Lake Mead just upstream. It is a landscape of hard rock, deep shadow, and blinding desert light.

The surrounding country is Mojave Desert at its most severe, sun-blasted and nearly bare, home to bighorn sheep that pick their way along the canyon cliffs, along with ravens, lizards, and the hardy desert plants that cling to the rock. The reservoir and river draw waterbirds and the occasional raptor, and the contrast between the harsh dry canyon and the huge blue lake behind the dam is part of what makes the scene so striking.

Fall, winter, and spring are the comfortable seasons here, with mild to cool temperatures that make the exposed, shadeless walkway a pleasure to walk. Winter days are often clear and pleasant, and the softer, lower sun of the cooler months lights the canyon and dam beautifully.

Summer is fierce, with desert heat that can be genuinely dangerous on the fully exposed bridge, so a summer visit is best kept short and reserved for the early morning or evening, with plenty of water in hand. In any season the wind can be strong on the span, funneled through the canyon, so it pays to dress for it and keep a grip on your belongings.

The closest Boutel™ stays, so you can turn this stop into an overnight. Each is an independently owned, editorially selected place to stay.