10. Lake Erie is the fourth-largest Great Lake in surface area, and the smallest in depth. It’s the 11th largest lake on the planet. 11. There is alleged to be a 30- to 40-foot-long “monster” in Lake Erie named Bessie. The earliest recorded sighting goes back as early as 1793. 12. Water in Lake Erie replaces itself in only 2.6 years, which is notable considering the water in Lake Superior takes two centuries.