NAS - Nonindigenous Aquatic Species

Quagga Mussel Sightings Distribution

This map layer is a compilation of confirmed quagga mussel sighting reports in the United States and Canada from 1988 through 2011 and is updated daily. It provides geographical and historical information to show distribution over space and time. The reports came from a variety of Federal, State, and municipal agencies, universities, public utilities, engineering and private consultant firms. These data are intended for geographic display and analysis at the national level, and for large regional areas. Sightings were reported with varying levels of accuracy. Some of the reports were as latitude-longitude coordinates, some as river miles, and others as just a lake, beach, harbor, or a water body and nearest town name. If no specific location was reported in a lake, the point was assigned to the center. The data should be displayed and analyzed at scales appropriate for 1:2,000,000-scale data. It is possible that quagga mussels can be found at other locations not displayed here, but have gone unreported to this effort. No responsibility is assumed by the U.S. Geological Survey in the use of these data. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data.

Quagga mussels are represented with the larger red markers. Click on a marker for more information. For zebra mussel distribution, click here. To REPORT an observation or collection of mussels, click here.

Suggested citation: Benson, A. J. 2014. Quagga mussel sightings distribution. Retrieved 12/20/2014 from

For more information, contact: Amy Benson,

References to non-U.S. Department of the Interior (DOI) products do not constitute an endorsement by the DOI. By viewing the Google Maps API on this web site the user agrees to these TERMS of Service set forth by Google.

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Page Contact Information: Pam Fuller - NAS Program (
Page Last Modified: Monday, October 28, 2013


The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. We highly recommend reviewing metadata files prior to interpreting these data.

Citation information: U.S. Geological Survey. [2014]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [12/20/2014].

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