Cow Shank Natural Bridge in Randolph County, Illinois
Photo by Jay Wilbur
NABSQNO 15S-755895-4223155. Cow Shank Natural Bridge is a waterfall natural bridge eroded through sandstone. It is located on private land and access requires permission of the land owner. It has a span of 20 feet, a height of 14 feet, a width of opening of 7 feet, a width of 6 feet, and a thickness of only 1 foot.