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Channel Stabilization

Demonstration Weir

The Demonstration Weir was a prototype structure, originally constructed in October 1999 by Lake Las Vegas. Located 1.7 miles downstream from the Historic Lateral Weir, the temporary structure was dismantled in 2013 and replaced with the Three Kids Weir.

Demonstration Weir

The Demonstration Weir was a rock riprap structure, consisting of approximately 47,000 tons of rock and recycled concrete. It ran from north to south across the Wash and was approximately 350 feet long and 125 feet wide.

Activities at the Demonstration Weir included a pilot project to determine the strategy for construction and revegetation methods for future erosion control projects.

It was decided that the crook of the bend would make an excellent spot for a grade control weir to be built. This spot was chosen because the natural bedrock at the site allowed for easy foundation construction, and the location was readily accessible through existing roads. In addition, there is a large area of sediment in front of the bend providing a great location for wetland development.

All of this material was carefully piled into the stream channel to form a weir that would resemble a small natural waterfall type structure that could help control the flow of water while also helping to build up wetland area as it pooled water.

While the Demonstration Weir is now gone, its legacy at the Las Vegas Wash lives on through the more than two acres of wetland habitat it created that provides homes for an abundance of birds.

Las Vegas Wash Project Coordination Team • 100 City Parkway, Suite 700 • Las Vegas, NV 89106 • (702) 822-3300