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Channel Stabilization

Monson & Visitor Center Weirs

weirs
Visitor Center and Monson Weirs (Photos courtesy Gene Hertzog)

These weirs were constructed in 2002 by the Bureau of Reclamation. They are located on a stretch of the Wash that runs through the Nature Preserve of the Clark County Wetlands Park. Standing at a Wash overlook point at the Nature Preserve provides a pleasing vista of these two attractive structures, with Monson Weir upstream and Visitor Center Weir downstream. The weirs are constructed of confined rock riprap, giving them the appearance of gently sloping rock waterfalls. Pied-billed Grebes, American Coots, and other waterbirds have been seen frolicking in the ponds that have been created by the weirs.

The structures are designed as one-stage weirs. The upstream slopes are set at 5:1, and the weir sections have a minimum width of 20 feet and a length of 160 feet (Monson Weir), and 150 feet (Visitor Center Weir). The existing channel bed immediately below the weir sections lies at approximately 1,627 feet (Monson Weir), and 1,618 feet (Visitor Center Weir). To meet expected future channel bed scour conditions, the structures’ apron floors are set at an elevation of 1,615 feet (Monson Weir), and 1,608 feet (Visitor Center Weir).

The Monson Weir covers approximately two acres, and the Visitor Center Weir has a permanent footprint of about three acres. Nearly 11 acres of land were impacted by the construction of the weirs.

On Oct. 5, 2002, more than 150 volunteers joined the Wash Project Team for the third Wash Green-Up and helped plant the impacted area with native plant species.

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