The authors would like to express their thanks to the Governing Board of the St. Johns River Water Management District (SJRWMD), and Douglas A. Munch (SJRWMD), for their continuing support of high resolution seismic reflection studies within the District. We also want to thank individual property owners for the generous use of their facilities and personal knowledge of the lakes. Finally we would like to recognize Dana Wiese (USGS), Shane Dossat (SJRWMD), Micah Weltmer (USGS), Cherie Hulsman-Reid (USGS), Laura Lacy (USGS) and Tracy Enright (USGS) for their technical support; and the reviewers for their comments and suggestions.