Endangered Species
Midwest Region



Map of the eight states in the Midwest Region: Illinois, Indiana, Iowa, Michigan, Minnesota, Missouri, Ohio and Wisconsin.

The Midwest Region includes Illinois, Indiana, Iowa, Michigan, Minnesota, Missouri, Ohio and Wisconsin. Find a location near you


Endangered Species Program

Conserving and restoring threatened and endangered species and their ecosystems


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Winged mapleleaf mussel

Photo by Nick Rowse; USFWS


Winged Mapleleaf (Quadrula fragosa)

Status: Endangered

Winged Mapleleaf

Photo by USFWS


Status: Endangered, listed June 20, 1991


Habitat: Medium to large rivers in mud, sand, or gravel


Lead Region: 3


Region 3 Lead Office: Twin Cities Field Office


Range: Arkansas, Minnesota, Missouri, Oklahoma, Wisconsin


Listen to a podcast!

Find out about the winged mapleleaf mussel and its conservation from field biologist Phil Delphey.


Audio Clip




The winged mapleleaf is an endangered freshwater mussel. Once known to live in about 38 different rivers from Minnesota to Arkansas, it is now found in only 5 rivers: the St. Croix River in Minnesota and Wisconsin, the Ouachita and Saline Rivers in Arkansas, and the Bourbeuse River in Missouri. The St. Croix River contains the only population known to be reproducing. Propagation efforts are progressing with hopes of restocking portions of the mapleleaf's historic range.


About Winged Mapleleaf

Fact sheet


Species Profile


Mussels of the St. Croix River


Upper Mississippi River Section 7 Consultation - Fact Sheet



5-Year Review - May 2015 (71-page PDF Adobe PDF Icon)


Releasing Captive-Reared Mussels into the Mississippi August 17, 2012


Propagation Activities - 2011 (1.6MB PDF Adobe PDF Icon)


St. Croix River Conservation Project - 2010 (PDF Adobe PDF Icon)


Host Fish Identification and Early Life Thermal Requirements (2-page PDF Adobe PDF Icon)

Early Life History Investigations - 2004 (24-page PDF Adobe PDF Icon)


Recovery Plan - 1997 (359-page pdf Adobe PDF Icon)


Mussels Home

Midwest Endangered Species Home


Last updated: March 4, 2019