During the last two weeks of February 1981, archeological reconnaissance was conducted of a proposed levee alignment for the lower Rock River Flood Protection Project in Rock Island County, Illinois. The survey was conducted by a survey crew from the Midwestern Archeological Research Center, Illinois State University, under Purchase Order No. DACW25-81-M-0526 from the United States Army Corps of Engineers, Rock Island District. This investigation located, both in the field and in available documents, prehistoric and historic sites along the levee. Survey methods included both pedestrian reconnaissance and shovel testing, a documentary search, and a primary informant survey. A total of 20 archeological sites were located in the field or in the documents. One additional site(historic) identified in the documents was not located during the survey. Sites within the alignment were evaluated as to size, temporal period(s) of occupation, general archeological significance, and potential impacts resulting from levee construction. The results of this survey indicate that three potentially significant sites along the levee alignment will be affected adversely, and testing of these sites is recommended in accordance with compliance procedures contained in (National Environmental Policy Act Public Law 91-190 and 33CFR 305.7).