underwater Acoustic Deterrent System weldment

A 350-ton crane swings the underwater Acoustic Deterrent System weldment, which includes speakers for emitting sounds specific to the hearing range of invasive carp, into place at Lock and Dam 19 on the Mississippi River Feb. 3, 2021. The weldment was installed in the lock approach, and U.S. Geological Survey, the U.S. Army Engineer Research and Development Center's Environmental Laboratory and partners will collect data for the next three years to evaluate its effectiveness in deterring invasive carp from the area.