Geography
Gray's Bay Dam on the Lake's eastern end helps control Lake Minnetonka's water level. This structure is also called the Headwaters Control Structure of Gray's Bay. The flow over the Dam ranges from zero to 300 cu ft (8.5 m3) per second or a daily rate of up to 26 million US gallons (98,000 m3). Evaporation from Lake Minnetonka can be as high as 50 million US gallons (190,000 m3) a day. According the Minnehaha Creek Watershed District, annual evaporation from the Lake is about 30 inches (760 mm) of water, or 11.5 billion US gallons (44,000,000 m3). This is countered by an average rate of 28 inches (710 mm) of rainfall, and 20 inches (508 mm) of run off.
Read more about this topic: Lake Minnetonka
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