Approximately 192 billion liters of water flow from Lake Superior through the St. Marys River daily. Another 130 billion liters of water flow from Lake Michigan through the Straits of Mackinac.
By the mid-19th century, the population had recovered to about 4 thousand.
However, within twenty years, it had dwindled to 110 inhabitants in 1877. The population decline was caused by the forced removal of natives for slave labor to Peru and Chile.