Federal Protections for Four Freshwater Mussels

Significant federal protections have been extended to four freshwater mussel species, designating over 3,800 miles of rivers as critical habitat. This action, taken on April 24, 2026, impacts 17 states across the Eastern U.S. and Midwest. The protected species include the rayed bean, sheepnose, snuffbox, and spectaclecase mussels.

These mussels play a critical role in maintaining water purity by filtering vast amounts of water daily. Conservation efforts within the newly designated habitats will address threats such as pollution, dams, and development. Specific management considerations may include studying water quality parameters like flow and oxygen levels.

The U.S. Fish and Wildlife Service's decision follows a lawsuit filed in July 2018 by the Center for Biological Diversity, advocating for critical habitat designations. Freshwater mussels, despite their ecological importance, are among the most endangered organisms in the United States, with water pollution and habitat degradation being primary causes of their decline.