temperature of flathead lake
About: - Flathead Lake is located in Northwest Montana. Flathead Lake has depths of up to 380 feet and has a rocky gravel bottom. Flathead Lake features the ideal water temperatures of 40-52 degrees F. and has ample food supply which allows the average catch length of 22-24. Species include Bull Trout, Cutthroat, Rainbow and Lake Trout, as well as Lake Whitefish. The Montana state record Lake Trout was caught in Flathead Lake.