Major lakes associated with Katmai National Park include Naknek, Grosvenor, Coville, Brooks, Idavain, Kulik, Nonvianuk, Hammersly, Murray, Dakavak, Katmai, Kaguyak, and several unnamed lakes. Water quality in all of these lakes and rivers remains essentially unaltered by man. Some bodies of water are heavily silted with glacial outwash sediments or volcanic ash. Others contain clear, unsilted water. Water levels in the larger lakes may vary seasonally by as many as seven feet.
Lakes in Katmai National Preserve include Spectacle, Kukaklek, Mirror, and Nonvianuk.