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Las Vegas Wash

Las Vegas Wash

The Las Vegas Wash is the primary channel through which the Las Vegas Valley's excess water returns to Lake Mead. Contributing approximately 2 percent of the water in Lake Mead, the water flowing through the Wash consists of urban runoff, shallow groundwater, storm water and releases from the valley's four water reclamation facilities.

Decades ago, the flows of the Wash created more than 2,000 acres of wetlands. By the 1990s, however, only about 200 acres of wetlands remained. The dramatic loss of vegetation reduced both the Wash’s ability to support wildlife and serve as a natural water filter.

Protecting and enhancing the Wash and surrounding wetlands

In 1998 at the request of its citizens advisory committee, the Water Authority reached out to the community in an effort to develop solutions to the problems affecting the Wash.

This led to the formation of the Las Vegas Wash Coordination Committee, a panel representing more than two dozen local, state and federal agencies, environmental group, the business community, the University of Nevada, Las Vegas, and private citizens.

The committee developed a long-term management plan aimed at stabilizing the Wash and enhancing the surrounding vegetation to protect soils, improve water quality, and increase aesthetics and wildlife habitat.

About the Las Vegas Wash

The Las Vegas Wash is the primary channel through which the valley's excess water returns to Lake Mead. Learn how these local wetlands help protect our water supply.

Progress

The Coordination Committee and its member agencies have taken significant strides toward improving the Wash. Efforts focus on reducing erosion, increasing the amount of wetland and riparian areas, environmental monitoring, and encouraging community involvement. Accomplishments to date include:

  • Constructed 19 of 21 identified erosion control structures (also known as weirs)
  • Installed more than 12 miles of bank protection
  • Implemented an invasive plant species management program
  • Revegetated more than 500 acres with trees, shrubs and emergents
  • Removed more than 500,000 pounds of trash from adjacent areas
  • Conducted extensive wildlife and water quality monitoring
  • Identified sites of significant cultural resource value
  • Hosted numerous volunteer events, involving more than 15,000 volunteers in Wash efforts

Coordination Committee member Clark County Parks and Recreation also offers the Clark County Wetlands Park, featuring a visitor center, picnic areas and trails for walking and biking.

Upper Diversion Weir near the Clark County Wetland Park Visitors Center.

Wash weir construction

To address erosion at the Wash, a total of 21 weirs — 19 of which are already completed — will use steel sheet pile, concrete, and flexible rock rip rap to stabilize the channel, reducing erosion.

Even portions of the imploded Stardust Casino, the El Rancho Casino, Desert Inn Hotel, MGM Hotel, Castaways and Westward Ho concrete rubble have been used in the stabilization effort.

As sections of the channel are stabilized, additional riparian and wetland habitat are established. The weirs help slow the water, creating a pond behind the structures in which wetland plants can flourish.

Saltceder, or Tamarisk, is an invasive and non-native species.

Saltcedar

Introduced in the United States in the late 1800s, a highly invasive, non-native tree named saltcedar (Tamarix ramosissima) was able to gain a foothold along the Wash. At its peak, tamarisk represented 80 percent of the vegetation, approximately 1,500 acres. Without any natural predators in the United States, saltcedar had been able to outcompete native plant species in the Southwest.

This weed draws down the water table, preventing other plants' roots from reaching it, and increases surface soil salinity, impacting the ability of less salt tolerant plants to establish. Insects who eat tamarisk, including the tamarisk leaf beetle (Diorhabda carinulata) arrived at the Las Vegas Wash in 2012 and have negatively impacted the remaining stands of tamarisk.

Using mechanical and chemical methods, the LVWCC has reduced the amount of tamarisk within the Clark County Wetlands Park to less than 65 acres.