Mike Vorhees, a biologist with the U.S. Army Corps of Engineers, Buffalo District, checks for signs of the invasive hydrilla plant and specific points near where herbicide has been applied to kill it off, North Tonawanda, New York, Aug. 13, 2024. Hydrilla, which is not native to the United States, can grow several feet tall and cause hazards to navigation in the Erie Canal, including binding up the propellers of boats, as well as forcing out native aquatic plants. (U.S. Army photo by Ryan Campbell)