The US Army Corps of Engineers (USACE), in coordination with US Fish and Wildlife Service and Bonneville Power Administration, reduced the size of the East Sand Island Caspian tern colony as part of a Caspian Tern Management Plan. Reduction in colony size and nesting dissuasion was implemented to reduce predation on juvenile salmonids in the Lower Columbia River Estuary. In addition, USACE created alternative nesting habitat at USACE-constructed islands in southern Oregon and northern California. During the 2016 breeding season, Turnstone helped implement social attraction and conduct monitoring surveys at the constructed islands, and assisted with predator control. Turnstone also helped implement dissuasion tactics for Caspian terns on islands in the Lower Columbia River Estuary, and monitored cormorant colonies on East Sand Island.