• Sunset at Lake Mead's Boulder Basin

    Lake Mead

    National Recreation Area AZ,NV

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  • Important Notice to Mariners

    Lake Mead water elevations will be declining throughout the summer. Before launching, check lake levels, launch ramp conditions, changes to Aids to Navigation and weather conditions by clicking on More »

  • Areas of Park Impacted by Storm Damage

    Strong storms rolled through Lake Mead National Recreation Area Aug. 3-4, causing damage to some areas of the park. Crews are working to restore the below locations. Debris may be present in other areas of the park, as well, especially in the backcountry. More »

  • Goldstrike Canyon, Arizona Hot Spring Trails Temporarily Closed

    A temporary emergency closure is in place for Goldstrike Canyon and Arizona Hot Spring trails within Lake Mead National Recreation Area, through Sept. 11. This closure includes National Park Service and Bureau of Reclamation lands. More »

  • Summer Fire Rules in Effect

    Lake Mead NRA is now enforcing summer fire restrictions. Please click 'more' to learn about the rules for fire during our hot, dry season. More »

Quagga Mussel Infestation

Dreissena rostiformis bugensis

quagga-top-image

The invasive quagga mussel (Dreissena rostiformis bugensis) was found in Lake Mead in January of 2007. Quagga mussels were likely transported to Lake Mead attached to the hull of a recreational vessel which had traveled from the Great Lakes area. Since being introduced to Lake Mead, quagga mussels have spread to Lake Mohave and have reproduced rapidly in both lakes.

Quagga mussels pose significant threats to infrastructure, recreation, and ecosystems in lakes Mead and Mohave. Adult mussels colonize water intakes, marina structures, and navigation aids requiring expensive defouling and repair. Shells of dead mussels are hazardous to people on beaches, and larval mussels, called veligers, are drawn into boat engines and bilges where they grow into adults and clog recreational equipment. Mussels feed by continuously filtering water for plankton, and the tremendous filtering capacity of large colonies of mussels can deprive other aquatic species of resources necessary for survival, causing irreversible ecosystem changes and losses of both native species and sport fisheries.

 
Sampling, Distribution, and Density
 
Sampling Quagga Mussel Chart
 
quagga-ICUN-Threat-Level

Photo Gallery


 

References


 

100th Meridian Initiative http://www.100thmeridian.org/zebras.asp

Superficial Geology of the Floor of Lake Mead (Arizona and Nevada) as Defined by Sidescan-sonar Imagery, Lake Floor Topography and Post-impoundment Sediment Thickness U.S. Geological Survey Open File Report 2009-1150

U.S. Bureau of Reclamation - Quagga Mussel Program http://www.usbr.gov/lc/region/programs/quagga.html

U.S. Department of Agriculture - National Invasive Species Information Centerhttp://www.invasivespeciesinfo.gov/aquatics/quagga.shtml

U.S. Geological Survey - Nonindigenous Aquatic Species http://nas.er.usgs.gov/queries/FactSheet.aspx?speciesID=95

Threat Level provided by the International Union for Conservation of Nature's (IUCN) Red List. http://www.iucnredlist.org/

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