GUTTENBERG, Iowa — The Army Corps will celebrate the start of its $11 million South Ferry Slough habitat rehabilitation project with a groundbreaking Tuesday at the North Gazebo in Guttenberg. Time: 1 p.m. The Corps plans to move river-bottom sediment from its Mississippi River navigaion chancel to create new habitat for floodplain species. The project includes reestablishing eroded islands and reinforcing shorelines. Additional stages of the project, in the North Ferry Slough and McMillan Island area, depends on available funding.