Nine-Mile Island is a river island located in Mosalem Township, Dubuque County, Iowa, between Dubuque, Iowa and Bellevue, Iowa on the Upper Mississippi River. Nine-Mile Island is situated within Pool 12 of the Upper Mississippi River, between Locks and Dams Nos. 11 and 12. The head of the island is at UMR river mile 574.3, with the southeastern end at mi…Nine-Mile Island is a river island located in Mosalem Township, Dubuque County, Iowa, between Dubuque, Iowa and Bellevue, Iowa on the Upper Mississippi River. Nine-Mile Island is situated within Pool 12 of the Upper Mississippi River, between Locks and Dams Nos. 11 and 12. The head of the island is at UMR river mile 574.3, with the southeastern end at mile 571.5. It is about 2 miles long and.5 mile at its widest point, with a total area of 454 acres. Within the island is a lake called Green Lake.
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