Water and the desert
Water, the Mojave, and how Las Vegas is possible
Las Vegas exists because of water in a place that has almost none. The valley's name means "the meadows," for the grasses fed by desert springs; the railroad put a town here in 1905; and Hoover Dam turned the Colorado River into the power and water that let a resort city grow in the Mojave. Understanding that dependence explains a lot about the modern city.
The meadows in the desert
Las Vegas is Spanish for "the meadows," a name earned by the grassy wetlands that once grew here where artesian springs pushed water to the surface of an otherwise dry Mojave Desert valley. Those springs made the site a reliable stop on the Old Spanish Trail and the reason people settled here at all, including Mormon missionaries who built an adobe fort in 1855.
The modern city, though, dates to the railroad. In 1905 the San Pedro, Los Angeles and Salt Lake Railroad auctioned town lots beside its new line, creating the downtown townsite; Las Vegas was incorporated as a city in 1911. For its first decades it was a small railroad and ranching town in the desert, not a resort.
Hoover Dam changes everything
The turning point was the dam. Built on the Colorado River in Black Canyon between 1931 and 1936, during the Great Depression, Hoover Dam brought thousands of workers to the region — housed in the purpose-built Boulder City — and delivered cheap hydroelectric power and stored water. The reservoir behind it, Lake Mead, is one of the largest in the United States by capacity.
That water and power are what made a large city in the Mojave feasible. Air conditioning, illuminated resorts, fountains, and pools all trace back to the infrastructure the dam and the Colorado River allocation provided. The dam is also why a federal reservoir sits forty-five minutes from the Strip as one of the region's signature day trips.
A city that watches its water
Because nearly all of the region's water comes from the Colorado River through Lake Mead, Southern Nevada is unusually focused on conservation. The Southern Nevada Water Authority manages supply for the valley, and prolonged drought on the Colorado River has lowered Lake Mead's levels over recent decades, making water a constant background concern for the metropolitan area.
For a visitor, this is context rather than an obstacle — the taps run and the fountains flow — but it explains the desert-adapted landscaping, the recycling of water, and why the story of Las Vegas is inseparable from the story of the river that supplies it.
Sources
Reviewed source trail
- Bureau of Reclamation — Hoover Dam history — checked 2026-07-12
- National Park Service — Lake Mead National Recreation Area — checked 2026-07-12
- Southern Nevada Water Authority — water supply — checked 2026-07-12