Downtown Denver from Sloans Lake Sloans Lake had its start when a farmer named Sloan dug a well in 1861. Overnight, the water spilled out of the well and started forming a lake. Some people jokingly called the body of water Sloan’s Leak. It is now a Denver City Park. Share this: Click to share on Facebook (Opens in new window) Facebook Click to share on Pinterest (Opens in new window) Pinterest Click to print (Opens in new window) Print