It is a glacial lake , with a maximum depth of 150 feet ( 45 metres ) , and at 1/2 mile to a mile ( 700 to 1,500 metres ) wide and 2 1/2 miles ( 3.9 kilometres ) long is one of the smallest lakes in the area .
It is a glacial lake , with a maximum depth of 150 feet ( 45 metres ) . At 1/2 mile to a mile ( 700 to 1,500 metres ) wide and 2 1/2 miles ( 3.9 kilometres ) long is one of the smallest lakes in the area .