Treatment of invasive phragmites patches that occur in both Minnesota and Wisconsin waters within Upper Mississippi River (UMR) Pools 4 through 8 (approximate River Miles 761-681) on the Upper Mississ... Treatment of invasive phragmites patches that occur in both Minnesota and Wisconsin waters within Upper Mississippi River (UMR) Pools 4 through 8 (approximate River Miles 761-681) on the Upper Mississippi River National Wildlife and Fish Refuge (Refuge)