Substantial flooding in 2011 to the Missouri River engulfed the support structure for one of Omaha Public Power District’s high voltage transmission lines. With extensive foundation scour and wash-out, we backfilled the scour holes with approximately 3,000 tons of sand and constructed a sheet pile cofferdam around the entire foundation. The cofferdam was reinforced with large riprap outside and a gabion blanket on top, offering protection from future flooding. When flooding devastated the area again in 2019, we repaired three transmission structure foundations on the Platte River, completing improvements on three miles of access roads that allowed us to safely move equipment. As done in 2011, we built sheet pile cofferdams with structural steel bracing and filled them with granular backfill and partially grouted riprap. A temporary trestle was also constructed for crane access to install a cofferdam in the river.