Cover photo: Corinne Griffith-Butler and Adam Schellhammer of American Rivers search for freshwater mussels after the 2025 removal of an obsolete dam on the Raystown Branch of the Juniata River in Bedford, PA. (Matt Otis) A few years ago, biologist Brian Watson was looking for endangered mussels in Virginia’s Rock Island Creek when his assistant went around a bend and made a startling discovery. It wasn’t a rare mussel. “There’s, like … a stone …