Lock operators for the U.S. Army Corps of Engineers Pittsburgh District at Lock and Dam 2, Allegheny River, watch boater 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)