This is all relative to the body of water. On an inland lake or reservoir, lake trout commonly run 20 to 60 feet in spring and summer, occasionally shifting to 80 to 100 feet—if forage and ample dissolved oxygen is available at those depths. In Great Lakes like Superior and Michigan, lakers often haunt depths to 100 feet or more. Interestingly, a deepwater lake trout variation known as the Siscowet haunts Lake Superior, commonly swimming 300 to 600 feet of water. The Siscowet, whose high fat body content is specially adapted for coldwater living, has been caught in some of Superior’s deepest sections at over 1,000 feet.