Andrew Clarke, river rangers for the U.S. Army Corps of Engineers Pittsburgh District, watches boaters at Lock and Dam 2, Allegheny River, heading to the fireworks show in Pittsburgh, July 4, 2021. The Pittsburgh District locks and dams are open year-round, including on federal holidays, for recreational boaters to enjoy the city’s views and for commercial barges to navigate the waterways safely. (U.S. Army Corps of Engineers Pittsburgh District photo by Michel Sauret)