(Salem, OR) -- The U.S. Army Corps of Engineers now faces two lawsuits over its plan to draw down water in Detroit Lake Reservoir much further than normal to help salmon runs. Salem filed a lawsuit claiming the plan could put their water treatment plant at risk because of mud that's expected to flow down the Santiam River. They say the federal government is required to complete a turbidity study, which is six months overdue. Marion County also filed a similar lawsuit.