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Monson & Visitor Center Weirs
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| Monson Weir |
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| Visitor Center Weir |
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| Monson and Visitor Center weir construction |
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| Monson and Visitor Center weir construction |
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 October 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.
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