From 2008 to 2012, Illinois State Archaeological Survey (ISAS) personnel performed archaeological investigations for the New Mississippi River Bridge project in East St. Louis and Fairmont City, St. Clair County, Illinois. This undertaking by the Illinois Department of Transportation included a new bridge, interstate connector, interchange construction, and local road improvements. An impact area of 82.9 ha of Mississippi River floodplain was surveyed, tested and subjected to data recovery investigations following Section 106 of the National Historic Preservation Act. Nine archaeological sites were affected, and mechanical excavations revealed a total of 6,434 prehistoric and 297 historic features. ISAS crews manually excavated nearly all of them. Data recovery investigations were performed at three sites: East St. Louis Precinct (11S706), Old Eighth Street (11S1790), and Mary B. Young (1S1817). The latter two sites were inhabited from circa AD 1870 to 1930 and represent portions of East St. Louis neighborhoods. Occupations at the East St. Louis Precinct, a 290 ha civic-ceremonial precinct of Greater Cahokia, dated from circa AD 950 to 1225. This volume summarizes the project’s research design, field and laboratory methods, and history of investigations for the sites and the project. It concludes with an evaluation of the project results.
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