Pentwater Lake has a surface area of 431 acres, a maximum depth of 50 feet, and a mean or average depth of 27 feet. The lake contains 11,590 acre-feet—a volume of water that would cover 18 square miles to a depth of one foot. The shoreline of Pentwater Lake is 6.2 miles long. The shoreline development factor of 2.1 indicates that the shoreline of Pentwater Lake is over twice as long than if the lake were perfectly round.
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