The Black River Falls area is home to a large population of the endangered Karner Blue butterfly. The city celebrates with the Karner Blue Butterfly Festival held annually on the third Saturday of July. The primary artery of transportation for Black River Falls is Interstate 94, which passes through the eastern edge of the city. US Highway 12, Wisconsin Highway 27, and Wisconsin Highway 54 also pass through the city. Black River Falls Area Airport (KBCK) serves the city and surrounding communities. The Union Pacific Railroad is adjacent to the city, but does not pass through the center. Its predecessor, the Chicago and North Western Railway, formerly operated a branch line into the town to serve an iron ore mine.