Big Platte Lake is one of the many lakes located in the northwestern part of Michigan's lower peninsula. There are two Platte lakes in Benzie County, Michigan, one of them being Big Platte and the other being Little Platte. Big Platte Lake covers 2,516 acres and is 3.3 miles long and 1.6 miles wide. The average depth of Platte Lake is 24 feet deep. The deepest point of the lake is measured at 95 feet deep. The Platte River flows through the lake at a speed of 120 cubic feet per second. This means the residence time for the water in Platte lake is 6 months. Also meaning that every hour 3.3 million gallons of water are passing through Big Platte Lake. This is an extremely fast residence time. The Platte River flows in and back out Platte lake and continues downstream in and out through Loon Lake until it finally reaches Lake Michigan.
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