Thunder Lake is a lake in Cass County, Minnesota, in the United States. Thunder Lake is 1,346 acres in size and reaches a depth of 95 feet. Thunder Lake is located in the western corner of the Mississippi River - Grand Rapids Watershed and is surrounded by dense forested areas including the Chippewa National Forest and the Land O'Lakes State …Thunder Lake is a lake in Cass County, Minnesota, in the United States. Thunder Lake is 1,346 acres in size and reaches a depth of 95 feet. Thunder Lake is located in the western corner of the Mississippi River - Grand Rapids Watershed and is surrounded by dense forested areas including the Chippewa National Forest and the Land O'Lakes State Forest. The shoreline is approximately 16 miles long and 83% of the lake has a depth greater than 15 feet. Thunder Lake has high water clarity with a Secchi depth of approximately 17 feet.
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