Twin Cities Ecological Services Field Office

Midwest Region



Twin Cities Field Office
4101 American Boulevard East
Bloomington, MN 55425
Phone: 952-252-0092
Fax: 952-646-2873
TTY: 1-800-877-8339 (Federal Relay)



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We work with public and private entities to conserve and restore Minnesota's endangered species, migratory birds, wetlands, and other important fish and wildlife resources.

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Feature Story

Partnering to Recover an Endangered Mussel Species


A batch of 15 Winged Mapleleaf mussels, recently PIT tagged.

A batch of 15 Winged Mapleleaf mussels, recently PIT tagged.

Photo Credit: Kelly Nail


June 30, 2016


Winged mapleleaf (Quadrula fragosa) mussels have been federally listed as endangered since July 22, 1991. These brown, freshwater mussels, which can grow up to four inches long, were thought to be down to one remaining population when their recovery plan was written in 1997. There have been many reasons for their decline, including zebra mussels, land use changes and habitat fragmentation coupled with a small population size.


Recently, a large number of winged mapleleaf individuals were found on the St. Croix River near Hudson, Wisconsin. To read more about the “happy accident” that led to this large number of mussels, check out this story by Service biologist Tamara Smith: After careful deliberation, it was decided these mussels would be captured, tagged and released into three areas to establish new or augment existing populations.


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Winged Mapleleaf Mussel Information





Last updated: March 1, 2017