Jackson Lake is located in north western Wyoming in Grand Teton National Park. This natural lake was enlarged by the construction of the Jackson Lake Dam which as originally built in 1911, enlarged again in 1916 and rebuilt once again by 1989. The top 33 ft (10 m), of the lake is utilized by farmers in Idaho for irrigation purposes. The lake is the remnant of large glacial gouging from the neighboring Teton Range to the west and the Yellowstone Plateau to the north. The lake is primarily fed by the Snake River which flows in from the north and empties at the Jackson Lake Dam. Jackson Lake is one of the largest high altitude lakes in the U.S. at an elevation of 6,772 ft (2,064 m) above sea level. The lake is up to 15 mi (24 km) long, 7 mi (11 km) wide and 438 ft (134 m) deep. The water of the lake averages below 60 °F (16 °C) even during the summer.
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