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Rexburg, city, seat (1913) of Madison county, southeastern Idaho, U.S., about 25 miles (40 km) northeast of Idaho Falls. The city was founded by Mormon farmers led by Thomas Ricks in 1883. It lies in the irrigated agricultural district of the Snake River plain and is a centre of grain and dairy production. Two-thirds of the city was destroyed on June 5, 1976, when the 310-foot- (94-metre-) high earthen Grand Teton Dam collapsed, spilling some...