Lake Ilo National Wildlife Refuge Glimpses of Paleoindian Life Archaeologists are frequently asked, "How do you know where to dig?" This question was answered quite dramatically at the Fish and Wildlife Service's Lake Ilo National Wildlife Refuge (NWR) near Dunn Center, North Dakota, in 1989. In response to safety concerns, the refuge's lake was lowered to allow replacement of an aging dam. The results were stunning! Six hundred acres of the old lake bed were literally covered by vast sca ...