As the number of flintknappers is increasing within the United States in recent years, the possibility of encountering the evidence of their activities is increasing as well. The most obvious sites of such recent activity is found within the areas of obsidian or CCS quarrying. However, sites of recent flintknapping are beginning to surface in less obvious locations as well. One such site was encountered by the Upper Klamath River Archaeological Project during the summer of 1999. This paper looks at how this site was recognized as being the result of modern activity. It also examines the warning signatures archaeologists should always keep in mind when examining lithic reduction sites wherever they might be found.