• Sunset at Lake Mead's Boulder Basin

    Lake Mead

    National Recreation Area AZ,NV

There are park alerts in effect.
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    The Nevada Department of Transportation reopened a northbound and southbound lane of Interstate 15 Sept. 12; therefore, Lake Mead National Recreation Area entrance fees will resume Sept. 14. More »

  • 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 »


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Date: June 8, 2009
Contact: Andrew S. Muñoz, 702-293-8691

LAS VEGAS - Laboratory results received by the Arizona Game and Fish Department report that the Koi Herpes Virus (KHV) is the probable cause of the Lake Mohave carp die-off. The virus, which can impact carp as water temperatures warm, affects gill function and can lead to suffocation and secondary infections. While there were bacterial issues, lab tests show KHV as the primary cause of the die-off. The virus doesn't pose a human health hazard.

Since Memorial Day weekend, dead carp have been washing up on the shores of Lake Mohave. The National Park Service has advised visitors that the water is safe for swimming. As a precaution, visitors should avoid handling the dead fish.

The test results confirm what park officials suspected was the cause. Water quality tests ruled out toxic algae.

Game officials are recommending that anglers avoid taking carp, and focus on other fish species in the lake until the die-off ends. Reports from around the lake do indicate that the die-off may be subsiding.

Park maintenance crews have been removing dead fish from the developed areas at Katherine Landing and Cottonwood Cove. Lake Mohave has about 200 miles of shoreline and it would be impractical to attempt to remove dead carp from all beaches. Affected areas are sporadic, it may take visitors a little more time to find a suitable spot on the beach.

- NPS -

Did You Know?

A wash in a Wilderness Area

"There is nothing like returning to a place that remains unchanged to find the ways in which you yourself have altered." -- Nelson Mandela