At least 450 family farms in the Ohio River Valley that are under water after a dam renovation caused mass flooding may finally be getting a life preserver, The Post has learned. The $3 billion renovation of the Olmsted Locks and Dam on the Ohio River was completed in 2018 by the US Army Corps of Engineers, but an unintended consequence was the flooding of 70,000 acres of soybean farmland in Kentucky, Illinois, and Missouri — turning some multi-generational farms into lakes. A jarring image shows a farm in near Cairo, Illinois, turned into an island due to the millions of gallons of water diverted by the Olmstead Lock and Dam. Obtained by NY Post Roughly 450 farmers filed lawsuits in 2018 and 2021 seeking damages for destroyed land and crops. But President Biden’s Department of Justice contested the suits, delaying financial relief. Sources told The Post an executive order ending the DOJ’s contestation of the claims and granting aid to the farmers is currently being considered in President Trump’s West Wing.…