The 2,609-acre Louisa Division is located just east of Wapello, Iowa in Louisa County. It is protected from moderate flooding by an Army Corps of Engineers levee stretching to Lock and Dam 17, approximately one mile south of the division border. The Port Louisa Refuge headquarters is located on this division.
The 1,400-acre Keithsburg Division is located in Mercer County, Illinois. The entire division lies within Pool 18, immediately north of Keithsburg, Illinois.
The 1,758-acre Big Timber Division is located two miles south of Muscatine, Iowa, in Pool 17. The division is comprised of a 1,252-acre backwater area, as well as Turkey Island, Turkey Towhead, Otter Island, and Ramsey Island.
Horseshoe Bend Division is located in the Iowa River floodplain, Louisa County, Iowa, approximately four miles upstream from its confluence with the Mississippi River. Horseshoe Bend is an unique mosaic of grassland, wet meadow, seasonal and semi-permanently flood emergent wetland habitat.
The Iowa River Corridor Project is an innovative floodplain management focus area that encompasses 50,000 acres of land stretching along 45 miles of river in Tama, Benton and Iowa counties. Within the project area, the U.S. Fish and Wildlife Service (Service) owns about 10,000 acres which are part of Port Louisa National Wildlife Refuge.
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