This volume reports on the 1985 Phase I and Phase II archaeological investigations conducted for the St. Louis District, Corps of Engineers in conjunction with the Shoreline Erosion study, D.M. No. 14, at Carlyle Lake, Clinton County, Illinois. Phase I pedestrian survey and shovel testing covered approximately 41 acres, encompassing over 18 separate tracts, and resulted in the location of 13 prehistoric archaeological sites, 5 of which were previously recorded. In addition, 22 isolated find locales produced 19 unknown prehistoric components and 4 historic components. Phase II testing was conducted at five prehistoric archaeological sites. One site, Illinois Archaeological Survey No. 11CT385, contained subsurface Late Woodland features. One of these produced a radiocarbon age of 1090 + or - 60 years, A.D. 860 + or - 60, in association with Late Woodland ceramics similar to Early Bluff or Raymond materials. An appendix by William M. Cremin details the botanical remains recovered, while another by Carl R. Falk summarizes the faunal remains. Analyses of all recovered materials are provided along with potential National Register of Historic Places eligibility recommendations for the tested sites.