The Colorado River is one of the most intensely used rivers in the western United States, providing recreational watercraft activities and domestic drinking, industrial, and irrigation water for over 22 million users in the desert southwest. The quality of this water must be maintained to guarantee a reliable and safe resource for its many uses. The Colorado River provides an estimated 97 percent of the inflow into Lake Mead. Lake Mohave is downstream of Lake Mead (separated by the Hoover Dam) and is part of the Lower Colorado River system.
The U.S. Geological Survey, in cooperation with the National Park Service and the Southern Nevada Water Authority, is currently collecting water-quality data in the Boulder Basin of Lake Mead near Sentinel Island and in Lake Mohave. Meteorological data is also being collected near Sentinel Island in cooperation with the Clark County Water Reclamation District. Discontinued stations that collected water-quality and meteorological data were located in Lake Mead: (1) Las Vegas Bay (Sites 1–4), (2) Overton Arm Basin near the confluence of the Muddy and Virgin Rivers, (3) Temple Basin near the Temple Bar Marina and (4) Virgin Basin, near the Narrows, which separates the Virgin and Boulder Basins. Water–quality and meteorological data are available on this web site for past and current stations and can be accessed under the Near-Real Time & Quality–Assured Data tab.