Twenty-two weirs. That’s how many structures stand guard along Las Vegas Wash. Las Vegas Wash is more than just a waterway. It’s a lifeline for this desert city. It carries over 200 million gallons of water daily to Lake Mead. This seemingly ordinary wash has a fascinating story.
For millions of years Las Vegas Wash acted as a natural drain. It channeled floodwaters away from the valley. Before development it handled the flows from rainwater. The first sewage treatment plant changed everything. Flows increased. The wash expanded. It deepened eroding the largest desert wetlands in the southwest.
This erosion had consequences. Increased silt flowed into Lake Mead. Migratory birds decreased. Native plants that filtered the water disappeared. Invasive species like African Tamarisk and Sahara Mustard took over. Las Vegas Wash became an impaired water source.
The wetlands of Las Vegas Wash once cleaned the water. They acted like kidneys filtering out harmful substances. Fertilizers oils and other contaminants were removed. This natural filtering is vital for Lake Mead our main water source.
In 1998 the Las Vegas Wash Coordinating Committee was formed. This group of agencies environmental groups and citizens developed a long-term plan. They aimed to stabilize the wash and enhance its vegetation. This ambitious project slowed erosion improved water quality and boosted wildlife habitats.
Rebuilding Las Vegas Wash involved using unusual materials. Concrete rubble from demolished casinos like the Stardust and the Desert Inn was used. This repurposed material helped stabilize the channel. The weirs slow the water creating ponds where wetland plants can thrive.
Saltcedar a highly invasive tree once dominated. It consumed 80 percent of the vegetation. But the tamarisk leaf beetle arrived in 2012. It helped reduce the saltcedar infestation. Mechanical and chemical methods helped reclaim the wetlands.
Today Las Vegas Wash is a testament to community effort. It’s a reminder that even in the desert life can flourish. With ongoing conservation efforts Las Vegas Wash continues its vital role. It protects our water supply and provides habitat for diverse plant and animal life. It is a vital part of the Las Vegas Valley’s ecosystem.