The leg is emblazoned with the logo from the University of Kentucky and the school's wildcat mascot. Fisherman Matt Willingham says he contacted the manufacturer about finding the leg's owner.
WKYT-TV in Lexington reports that it belonged to Fred Robinson, who played on the school's football team in the 1980s and had lost his leg in a work accident five years ago.
Robinson says he was shocked to find out someone found his $30,000 prosthetic leg.
Robinson, who now lives in Florida, says he lost the prosthetic while swimming over the Memorial Day weekend.