Rainbow Arch in Johnson County, Illinois
Photo by Jay Wilbur
NABSQNO 16S-320423-4137145. Rainbow Arch is an adult alcove natural arch eroded through sandstone. It is located on a private farm in the town of Cypress, Johnson County, Illinois. The arch appeared in the Vreeland catalog as number 23-27. Vreeland reported a span of 40 feet, a height of 6 feet, a width of 5 feet, and a thickness of 6 feet.